MT/T 935-2005 General technical requirements for coulometric sulfur analyzers
Some standard content:
ICS73.040
Registration No.: 15499—2005
Coal Industry Standard of the People's Republic of China
MT/T935—2005
General specifications for determinator of sulfurbycoulometrictitration
Published on 2005-02-14
National Development and Reform Commission
Implementation on 2005-06-01
Normative reference documents
Technical requirements
Test methods
Inspection rules
Marking, packaging, transportation and storage
MT/T935—2005
MT/T935-2005
Coulometric sulfur analyzers are widely used in coal laboratories. There are many manufacturers producing coulometric sulfur analyzers. The principles used are the same, but the technical requirements and performance settings of the instruments are not the same. In order to standardize the technical conditions of coulometric sulfur analyzers and make the performance of the instrument meet the requirements of the national standard GB/T214, this technical condition is specially formulated. This standard is proposed by the Science and Technology Development Department of the China Coal Industry Association. This standard is under the jurisdiction of the National Coal Standardization Technical Committee. The drafting units of this standard are: Coal Analysis Laboratory of the China Coal Research Institute, Jiangsu Jiangfen Electric Analytical Instrument Co., Ltd., and Changsha Sande Industrial Co., Ltd.
The main drafters of this standard are: Shi Yuying, Li Yueqing, Jiang Xueguo, and Wu Hanjiong. This standard is formulated for the first time.
1 Scope
General Technical Conditions for Coulometric Sulfur Analyzers
MT/T935-2005
This standard specifies the technical requirements, test methods, inspection rules and markings, packaging, transportation, and storage of coulometric sulfur analyzers. This standard applies to coulometric sulfur analyzers.
2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For any dated referenced document, its subsequent amendment (excluding errata) or revision is not applicable to this standard. However, the parties to the agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, its latest version applies to this standard. GB/T191 Pictorial marking for packaging, storage and transportation
GB/T214 Determination method for total sulfur in coal
GB/T2828 Batch inspection counting sampling procedure and sampling table (applicable to continuous batch inspection) GB/T15464 Technical conditions for packaging and transportation of instruments GB/T15479 Technical requirements and test methods for insulation resistance and insulation strength of industrial automation instruments GB/T18153 Mechanical safety accessible surface temperature Ergonomic data for determining the limit of hot surface temperature 3 Technical requirements
3.1 Basic structure of instrument: as shown in Figure 1.
一controller;
2——-push-pull rod:
3-—quartz combustion tube:
4——gas purification system;
3.2Working environment conditions:
Temperature: 5~40℃;
Relative humidity: ≤85%;
Combustion furnace;
6—porcelain boat;
一quartz tray:
8—electrolytic cell;
Figure 1 Coulometric sulfur analyzer device
Power supply AC (220±22) V, (50±1) Hz. 00000000o
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9——stirring rod;
10——magnetic stirrer;
11——gas filter.
, 3.3 Purchased and outsourced parts should have a certificate of conformity: All parts and components can be assembled only after they have passed the inspection. 3.4 High temperature furnace:
MT/T935—2005
3.4.1 Constant temperature zone: It should be of sufficient length. For horizontal furnaces, the length should not be less than 90mm. 3.4.2 Heating speed: The furnace temperature should be able to reach 1150℃ within 1h. 3.4.3 Temperature control accuracy: (1150±5)℃. Combustion tube: Made of materials such as corundum or quartz, it should be able to withstand temperatures above 1300℃ and have good airtightness. 3.4.42
3.4.5 High temperature furnace shell temperature: When the working temperature is 1150℃, ≤80℃, and there is a high temperature warning sign. 3.4.6 Insulation resistance and insulation strength: The insulation resistance between the power supply terminal of the independent power supply part of the measuring instrument and the casing is not less than 20MQ. It should be able to withstand 1500V, 50Hz AC, and last for 1min without arcing and breakdown. 3.5 Coulomb integrator:
3.5.1 Stability of integration unit: The drift within 10min after 30min of startup shall not exceed 30 words. 3.5.2 Linearity of integration unit: ±0.5%. 3.6 Maximum electrolysis current: ≥350mA.
3.7 Electrolysis current efficiency: 99%.
3.8 Decomposition time: The program advances pre-decomposition, and the decomposition time is adjustable. Generally, the pre-decomposition is adjusted to (45±5)s, and the decomposition time is adjusted to about 315s or automatically determined by the computer.
3.9 Electrolytic cell:
3.9.1 The capacity is not less than 400mL, and there are platinum electrolysis electrode pairs with an area of about 150mm2 and indicator electrode pairs with an area of about 15mm2. The response time of the indicator electrode should be less than 1S. The purity of the electrode should reach 99.99%, the electrode lead welding should be reliable, and the electrode and electrode rod should be tightly fused.
3.9.2 The structure is reasonable, the distance between the outlet of the combustion tube and the electrolytic cell is appropriate, the interface is sealed and leak-proof, and easy to clean. 3.9.3 The agitator rotates smoothly without abnormal noise, the speed is about 500r/min, the maximum speed is not less than 1000r/min, and it is continuously adjustable. 3.10 The air exhaust flow rate reaches 1000mL/min, and the air supply flow rate reaches 1500mL/min. 3.11 Appearance requirements:
The structure is reasonable, the metal plating and chemical treatment surface should be uniform in color, without exposed bottom, peeling, blistering, scars or scratches and scratches, and have good anti-corrosion and anti-rust performance.
3.12 Temperature program control unit:
3.12.1 Temperature rise control: meet the requirements of Article 3.4.2. 3.12.2
Program control: Meet the program advancement in 3.8.
3.12.3 Automatic sample delivery: Meet the requirements of GB/T214 to deliver the sample to the required temperature range accurately. 3.13 Precision and accuracy:
Precision: Precision shall meet the following two requirements. The difference between two repeated measurements of the same sample shall meet the repeatability requirements in GB/T214; a)
The variance of 10 repeated measurements of the same sample shall not be significantly greater than the repeatability variance specified in GB/T214. 3.13.2
Accuracy: The average value of the repeated measurement values of the same standard coal sample falls within the uncertainty range of the standard value. 4 Test method
4.1 High temperature furnace:
4.1.1 Determination of constant temperature zone length:
After the furnace temperature is raised to the set working temperature, stabilize for 15 minutes, insert the measuring end of a standard temperature measuring thermocouple from the inlet to about 100mm from the center of the furnace; record the insertion depth, stay for 5 to 10 minutes, read the potential value on the digital voltmeter every 10s, read 4 times and take the average value, push the thermocouple forward 10mm; repeat the above operation until the measuring end is pushed to the other end of the furnace where the temperature is (working temperature-5)℃, then slowly pull the thermocouple back, and the pulling distance, interval time and reading operations are the same as the pushing measurement. Take the average value of the two values of pushing and pulling, and find the interval with a temperature of (working temperature ± 5)℃, which is the constant temperature zone of the high temperature furnace, and its length should meet the requirements of 3.4.1.
MT/T935—2005
4.1.2 Insulation resistance and insulation strength: Determine in accordance with the relevant provisions of GB/T15479, and the results shall meet the requirements of Article 3.4.6. 4.1.3 Instrument or high-temperature furnace shell temperature measurement: Raise the furnace temperature to 1150℃, and measure in accordance with GB/T18153, which shall meet the requirements of Article 3.4.5. 4.2 Decomposition time measurement: Start the sample injection device, and use a stopwatch to measure the residence time of the sample in the pre-decomposition and decomposition zones, which shall meet the requirements of Article 3.8.
4.3 Electrolytic cell air tightness inspection: Use a latex tube to connect the electrolytic cell outlet and the electromagnetic pump exhaust end, adjust the exhaust flow rate to 1000mL/min, then close the straight two-way valve and other outlets, and observe the flow meter float descending speed. If the flow rate drops from 1000rnL/min to below 200mL/min within 2min, it is qualified.
4.4 Maximum electrolytic current determination:
4.4.1 Test equipment: Simulated electrolytic cell circuit board ~ block. 4.4.2 Determination method:
Remove the electrolytic cell, connect the simulated electrolytic cell, adjust the potentiometer knob on the circuit board, or use a computer program to adjust, and observe the electrolytic current indicator of the integral unit; or use a voltage calibrator with an accuracy of 1mV and an output range of not less than 100mV to connect the indicating electrode or its input terminal, and use an ammeter with a resolution of 1mA to connect the electrolytic electrode or its output terminal, adjust its changes, and measure its current. The measurement result should meet the requirements of Article 3.6.
4.5 Determination of integral linearity:
4.5.1 Test equipment:
a) 1 ammeter, 0.5 level, 500mA. b) 1 digital voltmeter of 0.01 level.
c) 1 resistance box of 0~100kQ, with an accuracy of 0.01α. 4.5.2 Test steps:
a) Disconnect the connection line of the electrolytic cell, connect the AC and DC ammeter and the resistance box in series to the electrolytic electrode circuit; b)
Turn on the host power supply, start the test, adjust the resistance of the resistance box, adjust the loop current to 50mA, 100mA, 150mA, 200mA, 250mA respectively, start the timer for 2min, and record the display value of the display at the same time. Repeat the test twice. Calculate the integral linearity P: according to formula (1), which should comply with the provisions of 3.5.2. の; -wi ×100%
Wnax,i ...
4.6 Precision and accuracy test:
4.6.1 Precision test:
(1)
a) Take 6 coal samples with different sulfur contents and measure them twice each. The difference between the two measured values should fall within the repeatability limit specified in GB/T214;
b) The same coal sample is measured 10 times. The variance of the repeated measurement values (r) should not be significantly different from the variance calculated by the repeatability limit specified in GB/T214. The comparison method is as follows: Calculate the variance of 10 repeated measurements according to formula (2): S -()\/n
Calculate the repeatability limit (r) in GB/T214 according to formula (3): S
If S≤S, the variance is qualified;
If S>S, calculate the statistic F according to formula (4) (2)
(3)
MT/T935—2005
..........
Look up the table to get the critical value F. .05,9.c0
. =2.41, if F≤2.41, then S2 and S? have no significant difference; otherwise S? is significantly greater than S. 4.6.2 Accuracy test:
·(4)
Repeat the test on 6 standard coal samples with different sulfur contents (high, medium and low sulfur contents), calculate the average value of the repeated test for each coal sample, and each average value should fall within the uncertainty range of the standard value. 4.7 Appearance inspection:
Use visual inspection to meet the requirements of Article 3.11.
Inspection rules
The measuring instrument should be subject to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection Items
Inspection Items
Constant Temperature Zone
Heating Rate
Temperature Control Precision
Combustion Tube
High Temperature Furnace Shell Temperature
Insulation Resistance
Insulation Strength
Integral Unit Stability
Integral Unit Linearity
Maximum Electrolysis Current
Electrolysis Current Efficiency
Decomposition Time
Precision
Accuracy
Note: "△" in the table indicates items to be inspected. Factory Inspection
Technical Requirements Article Number
Factory Inspection
Type Inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only leave the factory after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection shall be conducted when any of the following conditions exist: a)
Final identification of new products put into production or old products transferred to other factories for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is conducted, it shall be conducted once every 2 years;
When there is a significant difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling shall be conducted in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units shall be sampled; b) When the batch is between 26 and 90 units, 3 units shall be sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, then 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is greater than 0 and less than 3, then 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged to be qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed on the appropriate and obvious position of the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packaging and be filled with paper strips, foam plastics, etc. The following documents should be attached to the packaging box:
Product certificate;
Product instruction manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packaging box should be clear and neat, and include: 6.2.3
Product name, trademark and model;
Name of the manufacturing unit and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions of the packaging box, gross weight, and date of manufacture; d)
e) Graphic markings such as "handle with care", "upward", and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under conditions that can avoid the direct impact of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a ventilated, dry warehouse without harmful gases such as acid or alkali. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by China Coal Industry Press
(No. 35, Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Printed by Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them1 digital voltmeter of level 01.
c) 1 resistance box of 0～100kQ, with an accuracy of 0.01α. 4.5.2 Test steps:
a) Disconnect the connection line of the electrolytic cell, connect the AC and DC ammeters and the resistance box in series to the electrolytic electrode circuit; b)
Turn on the host power supply, start the test, adjust the resistance value of the resistance box, adjust the loop current to 50mA, 100mA, 150mA, 200mA, 250mA respectively, start the timer for 2min, and record the display value of the display at the same time, and repeat the test twice. Calculate the integral linearity P: according to formula (1), which should meet the requirements of 3.5.2.の; -wi ×100%
Wnax,i
Wherein:
—arithmetic mean of two measured values, mg; Wi
theoretical value of sulfur under a corresponding current (set by the manufacturer during design), mg; -maximum value displayed by a single measurement, mg.
4.6 Precision and accuracy test:
4.6.1 Precision test:
(1)
a) Take 6 coal samples with different sulfur contents and conduct 2 repeated measurements on each of them. The difference between the 2 measured values should fall within the repeatability limit specified in GB/T214;
b) Conduct 10 repeated measurements on the same coal sample. The variance of the repeated measurement values (r) should not be significantly different from the variance calculated by the repeatability limit specified in GB/T214. The comparison method is as follows: Calculate the variance of 10 repeated measurements according to formula (2): S -()\/n
Calculate the repeatability limit (r) in GB/T214 according to formula (3): S
If S≤S, the variance is qualified;
If S>S, calculate the statistic F according to formula (4) (2)
(3)
MT/T935—2005
..........
Look up the table to get the critical value F. .05,9.c0
. =2.41, if F≤2.41, then S2 and S? have no significant difference; otherwise S? is significantly greater than S. 4.6.2 Accuracy test:
·(4)
Repeat the test on 6 standard coal samples with different sulfur contents (high, medium and low sulfur contents), calculate the average value of the repeated test for each coal sample, and each average value should fall within the uncertainty range of the standard value. 4.7 Appearance inspection:
Use visual inspection to meet the requirements of Article 3.11.
Inspection rules
The measuring instrument should be subject to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection Items
Inspection Items
Constant Temperature Zone
Heating Rate
Temperature Control Precision
Combustion Tube
High Temperature Furnace Shell Temperature
Insulation Resistance
Insulation Strength
Integral Unit Stability
Integral Unit Linearity
Maximum Electrolysis Current
Electrolysis Current Efficiency
Decomposition Time
Precision
Accuracy
Note: "△" in the table indicates items to be inspected. Factory Inspection
Technical Requirements Article Number
Factory Inspection
Type Inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only leave the factory after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection shall be conducted when any of the following conditions exist: a)
Final identification of new products put into production or old products transferred to other factories for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is conducted, it shall be conducted once every 2 years;
When there is a significant difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling shall be conducted in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units shall be sampled; b) When the batch is between 26 and 90 units, 3 units shall be sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, then 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is greater than 0 and less than 3, then 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged to be qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed on the appropriate and obvious position of the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packaging and be filled with paper strips, foam plastics, etc. The following documents should be attached to the packaging box:
Product certificate;
Product instruction manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packaging box should be clear and neat, and include: 6.2.3
Product name, trademark and model;
Name of the manufacturing unit and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions of the packaging box, gross weight, and date of manufacture; d)
e) Graphic markings such as "handle with care", "upward", and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under conditions that can avoid the direct impact of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a ventilated, dry warehouse without harmful gases such as acid or alkali. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by China Coal Industry Press
(No. 35, Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Printed by Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them1 digital voltmeter of level 01.
c) 1 resistance box of 0～100kQ, with an accuracy of 0.01α. 4.5.2 Test steps:
a) Disconnect the connection line of the electrolytic cell, connect the AC and DC ammeters and the resistance box in series to the electrolytic electrode circuit; b)
Turn on the host power supply, start the test, adjust the resistance value of the resistance box, adjust the loop current to 50mA, 100mA, 150mA, 200mA, 250mA respectively, start the timer for 2min, and record the display value of the display at the same time, and repeat the test twice. Calculate the integral linearity P: according to formula (1), which should meet the requirements of 3.5.2.の; -wi ×100%
Wnax,i
Wherein:
—arithmetic mean of two measured values, mg; Wi
theoretical value of sulfur under a corresponding current (set by the manufacturer during design), mg; -maximum value displayed by a single measurement, mg.
4.6 Precision and accuracy test:
4.6.1 Precision test:
(1)
a) Take 6 coal samples with different sulfur contents and conduct 2 repeated measurements on each of them. The difference between the 2 measured values should fall within the repeatability limit specified in GB/T214;
b) Conduct 10 repeated measurements on the same coal sample. The variance of the repeated measurement values (r) should not be significantly different from the variance calculated by the repeatability limit specified in GB/T214. The comparison method is as follows: Calculate the variance of 10 repeated measurements according to formula (2): S -()\/n
Calculate the repeatability limit (r) in GB/T214 according to formula (3): S
If S≤S, the variance is qualified;
If S>S, calculate the statistic F according to formula (4) (2)
(3)
MT/T935—2005
..........
Look up the table to get the critical value F. .05,9.c0
. =2.41, if F≤2.41, then S2 and S? have no significant difference; otherwise S? is significantly greater than S. 4.6.2 Accuracy test:
·(4)
Repeat the test on 6 standard coal samples with different sulfur contents (high, medium and low sulfur contents), calculate the average value of the repeated test for each coal sample, and each average value should fall within the uncertainty range of the standard value. 4.7 Appearance inspection:
Use visual inspection to meet the requirements of Article 3.11.
Inspection rules
The measuring instrument should be subject to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection Items
Inspection Items
Constant Temperature Zone
Heating Rate
Temperature Control Precision
Combustion Tube
High Temperature Furnace Shell Temperature
Insulation Resistance
Insulation Strength
Integral Unit Stability
Integral Unit Linearity
Maximum Electrolysis Current
Electrolysis Current Efficiency
Decomposition Time
Precision
Accuracy
Note: "△" in the table indicates items to be inspected. Factory Inspection
Technical Requirements Article Number
Factory Inspection
Type Inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only leave the factory after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection shall be conducted when any of the following conditions exist: a)
Final identification of new products put into production or old products transferred to other factories for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is conducted, it shall be conducted once every 2 years;
When there is a significant difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling shall be conducted in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units shall be sampled; b) When the batch is between 26 and 90 units, 3 units shall be sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, then 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is greater than 0 and less than 3, then 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged to be qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed on the appropriate and obvious position of the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packaging and be filled with paper strips, foam plastics, etc. The following documents should be attached to the packaging box:
Product certificate;
Product instruction manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packaging box should be clear and neat, and include: 6.2.3
Product name, trademark and model;
Name of the manufacturing unit and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions of the packaging box, gross weight, and date of manufacture; d)
e) Graphic markings such as "handle with care", "upward", and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under conditions that can avoid the direct impact of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a ventilated, dry warehouse without harmful gases such as acid or alkali. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by China Coal Industry Press
(No. 35, Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Printed by Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005Www.bzxZ.net
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them1 Precision test:
（1）
a) Take 6 coal samples with different sulfur contents and measure them twice each. The difference between the two measured values should fall within the repeatability limit specified in GB/T214;
b) The same coal sample is measured 10 times. There should be no significant difference between the variance of the repeated measurement values (r) and the variance calculated based on the repeatability limit specified in GB/T214. The comparison method is as follows: Calculate the variance of 10 repeated measurements according to formula (2): S -()\/n
Calculate the repeatability limit (r) in GB/T214 according to formula (3): S
If S≤S, the variance is qualified;
If S>S, calculate the statistic F according to formula (4) (2)
(3)
MT/T935—2005
..........
Look up the table to get the critical value F. .05,9.c0
. =2.41, if F≤2.41, then S2 and S? have no significant difference; otherwise S? is significantly greater than S. 4.6.2 Accuracy test:
·(4)
Repeat the test on 6 standard coal samples with different sulfur contents (high, medium and low sulfur contents), calculate the average value of the repeated test for each coal sample, and each average value should fall within the uncertainty range of the standard value. 4.7 Appearance inspection:
Use visual inspection to meet the requirements of Article 3.11.
Inspection rules
The measuring instrument should be subject to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection Items
Inspection Items
Constant Temperature Zone
Heating Rate
Temperature Control Precision
Combustion Tube
High Temperature Furnace Shell Temperature
Insulation Resistance
Insulation Strength
Integral Unit Stability
Integral Unit Linearity
Maximum Electrolysis Current
Electrolysis Current Efficiency
Decomposition Time
Precision
Accuracy
Note: "△" in the table indicates items to be inspected. Factory Inspection
Technical Requirements Article Number
Factory Inspection
Type Inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only leave the factory after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection shall be conducted when any of the following conditions exist: a)
Final identification of new products put into production or old products transferred to other factories for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is conducted, it shall be conducted once every 2 years;
When there is a significant difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling shall be conducted in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units shall be sampled; b) When the batch is between 26 and 90 units, 3 units shall be sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, then 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is greater than 0 and less than 3, then 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged to be qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed on the appropriate and obvious position of the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packaging and be filled with paper strips, foam plastics, etc. The following documents should be attached to the packaging box:
Product certificate;
Product instruction manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packaging box should be clear and neat, and include: 6.2.3
Product name, trademark and model;
Name of the manufacturing unit and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions of the packaging box, gross weight, and date of manufacture; d)
e) Graphic markings such as "handle with care", "upward", and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under conditions that can avoid the direct impact of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a ventilated, dry warehouse without harmful gases such as acid or alkali. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by China Coal Industry Press
(No. 35, Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Printed by Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them1 Precision test:
（1）
a) Take 6 coal samples with different sulfur contents and measure them twice each. The difference between the two measured values should fall within the repeatability limit specified in GB/T214;
b) The same coal sample is measured 10 times. There should be no significant difference between the variance of the repeated measurement values (r) and the variance calculated based on the repeatability limit specified in GB/T214. The comparison method is as follows: Calculate the variance of 10 repeated measurements according to formula (2): S -()\/n
Calculate the repeatability limit (r) in GB/T214 according to formula (3): S
If S≤S, the variance is qualified;
If S>S, calculate the statistic F according to formula (4) (2)
(3)
MT/T935—2005
..........
Look up the table to get the critical value F. .05,9.c0
. =2.41, if F≤2.41, then S2 and S? have no significant difference; otherwise S? is significantly greater than S. 4.6.2 Accuracy test:
·(4)
Repeat the test on 6 standard coal samples with different sulfur contents (high, medium and low sulfur contents), calculate the average value of the repeated test for each coal sample, and each average value should fall within the uncertainty range of the standard value. 4.7 Appearance inspection:
Use visual inspection to meet the requirements of Article 3.11.
Inspection rules
The measuring instrument should be subject to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection Items
Inspection Items
Constant Temperature Zone
Heating Rate
Temperature Control Precision
Combustion Tube
High Temperature Furnace Shell Temperature
Insulation Resistance
Insulation Strength
Integral Unit Stability
Integral Unit Linearity
Maximum Electrolysis Current
Electrolysis Current Efficiency
Decomposition Time
Precision
Accuracy
Note: "△" in the table indicates items to be inspected. Factory Inspection
Technical Requirements Article Number
Factory Inspection
Type Inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only leave the factory after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection shall be conducted when any of the following conditions exist: a)
Final identification of new products put into production or old products transferred to other factories for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is conducted, it shall be conducted once every 2 years;
When there is a significant difference between the factory inspection results and the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling shall be conducted in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units shall be sampled; b) When the batch is between 26 and 90 units, 3 units shall be sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, then 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is greater than 0 and less than 3, then 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged to be qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed on the appropriate and obvious position of the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packaging and be filled with paper strips, foam plastics, etc. The following documents should be attached to the packaging box:
Product certificate;
Product instruction manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packaging box should be clear and neat, and include: 6.2.3
Product name, trademark and model;
Name of the manufacturing unit and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions of the packaging box, gross weight, and date of manufacture; d)
e) Graphic markings such as "handle with care", "upward", and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under conditions that can avoid the direct impact of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a ventilated, dry warehouse without harmful gases such as acid or alkali. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by China Coal Industry Press
(No. 35, Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Printed by Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them11 requirements.
Inspection rules
The measuring instrument shall be subjected to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection items
Inspection items
Constant temperature zone
Heating speed
Temperature control accuracy
Combustion tube
High temperature furnace shell temperature
Insulation resistance
Insulation strength
Integration unit stability
Integration unit linearity
Maximum electrolysis current
Electrolysis current efficiency
Decomposition time
Precision
Accuracy
Note: "△" in the table indicates the items to be inspected. Factory inspection
Technical requirements Article number
Factory inspection
Type inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only be shipped after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection should be carried out when the product has any of the following conditions: a)
Final identification of new products put into production or old products transferred to the factory for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is carried out, it is carried out once every 2 years;
When the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling is carried out in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units are sampled; b) When the batch is between 26 and 90 units, 3 units are sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged as unqualified. If the number of unqualified products in the first sample is greater than 0 and less than 3, 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged as qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed in an appropriate and obvious position on the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packages and be filled with paper strips, foam plastics, etc. The following documents should be included in the packing box:
Product certificate;
Product manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packing box should be clear and neat, and include:6.2.3
Product name, trademark and model;
Name of the manufacturer and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions, gross weight and date of manufacture of the packing box;d)
e) The graphic markings such as "handle with care", "upward" and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under the condition that they can avoid the direct influence of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a well-ventilated, dry warehouse without harmful gases such as acid or alkaline. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by Coal Industry Press
(No. 35 Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Beijing Geological Printing Factory
Published by Xinhua Bookstore Beijing Publishing House Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them11 requirements.
Inspection rules
The measuring instrument shall be subjected to factory inspection and type inspection. The inspection items are shown in Table 1. Table 1 Inspection items
Inspection items
Constant temperature zone
Heating speed
Temperature control accuracy
Combustion tube
High temperature furnace shell temperature
Insulation resistance
Insulation strength
Integration unit stability
Integration unit linearity
Maximum electrolysis current
Electrolysis current efficiency
Decomposition time
Precision
Accuracy
Note: "△" in the table indicates the items to be inspected. Factory inspection
Technical requirements Article number
Factory inspection
Type inspection
Each measuring instrument must be inspected by the manufacturer's quality inspection department according to the factory inspection items specified in Table 1. It can only be shipped after passing the inspection and issuing a certificate of conformity.
5.2 Type inspection
5.2.1 Type inspection should be carried out when the product has any of the following conditions: a)
Final identification of new products put into production or old products transferred to the factory for production; after formal production, if there are major changes in structure, materials, and processes that may affect product performance; when production is resumed after more than 2 years of suspension;
When mass production is carried out, it is carried out once every 2 years;
When the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. 5.2.2 Sampling rules:
Sampling is carried out in accordance with GB/T2828.
a) When the batch does not exceed 25 units, 2 units are sampled; b) When the batch is between 26 and 90 units, 3 units are sampled. 5.2.3 Judgment rules:
When the batch does not exceed 25 units:
MT/T935—2005
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 2, the batch of products is judged to be unqualified. If the number of unqualified samples in the first sample is equal to 1, 2 units are randomly selected as the second sample according to 5:2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is equal to 1, it is judged to be qualified, otherwise it is unqualified. When the batch is between 26 and 90 units:
According to the inspection results of the sample (first sample), if the number of products (inspection items) are all qualified, the batch of products is judged to be qualified. If the number of unqualified products is greater than or equal to 3, the batch of products is judged as unqualified. If the number of unqualified products in the first sample is greater than 0 and less than 3, 3 units are randomly selected as the second sample according to 5.2.2 for repeated inspection. If the sum of the number of unqualified products in the two samples is less than or equal to 3, the batch of products is judged as qualified, otherwise it is unqualified. 6 Marking, packaging, transportation and storage
6.1 Marking
The product nameplate should be fixed in an appropriate and obvious position on the product, and the following contents should be indicated: a) Name of the manufacturing unit;
b) Product name, trademark and model;
Manufacturing date and number;
d) Main parameters of the product.
6.2 Packaging
6.2.1 Product packaging should comply with the provisions of GB/T15464. Fragile products should have special small packages and be filled with paper strips, foam plastics, etc. The following documents should be included in the packing box:
Product certificate;
Product manual;
Product maintenance service card;
Packing list.
The markings on the outer surface of the packing box should be clear and neat, and include:6.2.3
Product name, trademark and model;
Name of the manufacturer and the name of the shipping station;
Name of the consignee and the name of the receiving (or arrival) station; the overall dimensions, gross weight and date of manufacture of the packing box;d)
e) The graphic markings such as "handle with care", "upward" and "afraid of moisture" should comply with the provisions of GB/T191. 6.3 Transportation
Packaged products can be transported by any means of transportation under the condition that they can avoid the direct influence of rain and snow. During transportation, they should be handled with care, not inverted, and strictly prohibited from being dropped or pressed to prevent damage. 6.4 Storage
The product should be stored in a well-ventilated, dry warehouse without harmful gases such as acid or alkaline. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by Coal Industry Press
(No. 35 Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Beijing Geological Printing Factory
Published by Xinhua Bookstore Beijing Publishing House Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them4 Storage
The product should be stored in a well-ventilated, dry warehouse without harmful gases such as acid or alkaline. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by Coal Industry Press
(No. 35 Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them4 Storage
The product should be stored in a well-ventilated, dry warehouse without harmful gases such as acid or alkaline. 5
MT/T 935—2005
Coal
Industry Standard of the People's Republic of China
General Technical Specifications for Coulometric Sulfur Tester
MT/T935—2005
Published by Coal Industry Press
(No. 35 Yaoyaoju, Chaoyang District, Beijing 100029) Website: www.cciph.com.cn
Beijing Geological Printing Factory
Published by Beijing Publishing House of Xinhua Bookstore Line
Format 880mm×1230mm1/16
Word count 9,000 words
First edition in May 2005
Printing sheet 5/8
Print run 1-300
First printing in May 2005
155020·26
Violators will be prosecuted
All rights reserved
If there are any quality problems such as missing pages, reversed pages, or loose pages in this book, our company will be responsible for replacing them
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