HG/T 3125-1998 Technical requirements for explosion-proof industrial pH meters
Some standard content:
ICs71.120;25.040;17.040.30
Registration No. 1392-1998
Chemical Industry Standard of the People's Republic of China
HG/T 3125—1998
Technical conditions for explosion-proof industrial pH meters
The technical standards of
the explosion-proof pH transmitter1998-03-17Release
199810--01Implementation
Release by Ministry of Chemical Industry of the People's Republic of ChinaW. Scope
Chemical Industry Standard of the People's Republic of China
Technical conditions for explosion-proof industrial pH meters
The technical standards of the explosion --proof pH transmitterHG/T3125—1998
This standard specifies the classification requirements, test methods, inspection rules, marking, packaging, transportation, storage and other contents of intrinsically safe remote-controlled industrial pH meters.
This standard applies to industrial pH meters with intrinsically safe explosion-proof type (hereinafter referred to as instruments). 2 Referenced standards
The following standards contain provisions that constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and all parties using this standard should explore the possibility of using the latest versions of the following standards GB2423,4-81 Basic environmental test procedures for electrical and electronic products Test Db cyclic damp heat test method GB3836.1-81 General requirements for explosion-proof electrical equipment for explosive atmospheres GB3836.4-83 Explosion-proof electrical equipment for explosive atmospheres Intrinsically safe circuits and electrical equipment: "i\ZBY002-81
ZBY092-82
Instrument transportation, transportation storage, basic environmental conditions and test methods Industrial automation instrument electromagnetic interference and power distortion influence test method JB/T6858-93 pH meter and ion meter test method 3 Classification and basic parameters||tt| |3.1 Classification
3.1.1 According to the accuracy of the instrument, it can be divided into three types: ±0.2pH, ±0.1pH, and ±0.05pH. 3.1.2 According to the structural form, it can be divided into integrated type and split type. 3.1.3 Transducer classification:
8) According to the structural form: flow type, immersion type or other forms: b) According to the pressure resistance form: normal pressure type, front pressure type; ) According to the temperature resistance form: normal temperature type and temperature resistance type, 3.2 Basic parameters
3.2.1 Measuring range
The measuring range of the instrument is 0~14pH or determined according to the requirements of the user. 3.2.2 Output signal
It provides 4~20mA, 1~5VDC or other corresponding standard signal output through the safety circuit for recording or control. 3. 3 Working conditions
The device should be able to work normally under the following conditions: a) Power supply voltage: 24VDC, supplied by the safety cabinet, approved by the Ministry of Chemical Industry of the People's Republic of China on March 17, 1998 and implemented on October 1, 1998
WW.bzSOSO.cOmHG/T3125-1998
b) Medium temperature: 0~130℃ (or depending on the electrode); c) Medium pressure: 0~0.6MPa (depending on the electrode) d) Ambient temperature: 040℃,
e) Relative humidity: ≤90%
f) There should be no strong electromagnetic interference, strong corrosive substances and severe vibration at the installation site, g) The measuring medium should be an aqueous solution, and there should be no substances that react to the electrode in the solution. 4 Requirements
4.1 The explosion-proof performance should comply with the relevant provisions of GB3836.4, the explosion-proof mark must be obvious and eye-catching, without any defects, and the "explosion-proof certificate" issued by the national designated inspection unit should be obtained. 4.2 Appearance | |tt||4.2.1 The instrument housing and nameplate should be smooth and intact without any peeling or damage. The fasteners should not be loose or damaged. 4.2.2 The instrument surface coating should be uniform, without obvious scratches, cracks or bubbles. 4.3 Accuracy
The accuracy of the instrument is: ±0.2pH, ±0.1pH, ±0.05pH4.4 Stability of the converter
The stability of the instrument converter should not exceed the requirements of the table! Table #
Accuracy
Stability 4.5 Repeatability 40.05 Repeatability error of the instrument shall not exceed the provisions in Table 2 Accuracy Repeatability error 4.6 Response time The response time of the instrument shall not exceed 10S 4.7 Effect of ambient temperature change When the ambient temperature changes in the range of 0 to 40°C, the change in the instrument reading shall not exceed the provisions in Table 3. 4.8 Effect of ambient humidity change When the ambient humidity changes in the range of 45% to 90%, the reading error shall be within the accuracy range. ±0.05
pH/10r
4.9 Influence of power supply voltage change
When the instrument is running normally, when the output voltage of the safety barrier changes within the range of 24±2.4VDC, the change of the instrument reading should not be greater than the provisions in Table 4.
W.bzsoso：com4.10 Insulation resistance
Accuracy
Influence error
HG/T3125-1998
The insulation resistance between the instrument housing and the power supply phase shall not be less than 20M. 4.11 Insulation dielectric strength
The instrument converter power supply applies a 500V voltage (AC) with a frequency of 50±1Hz to the housing. After a 1min withstand voltage test, no breakdown or flashover shall occur.
4.12 Anti-interference performance
According to ZBY092, the average change value of the instrument indication within 10m after the interference is applied is within the accuracy range. 4.13 Vibration
The instrument is in the process of vibration test
4.14 Anti-continuous impact performance
According to ZBY002 standard, after the test, the instrument works normally. 4.15 Maximum surface temperatureWww.bzxZ.net
, and there should be no mechanical damage.
The maximum surface temperature of the instrument should be lower than the value specified by the temperature group of its explosion-proof grade. 4.16 Input impedance
The input impedance of the instrument should comply with the requirements in Table 5. Accuracy (pH)
Input impedance?
4.17 Input current
The input current of the instrument shall comply with the requirements in Table 6. Accuracy (pH)
Input current A
5 Test method
5.1 Check the explosion-proof mark of the instrument, which shall comply with the requirements of 4.1 of this standard. 5.2 Visually inspect the appearance of the instrument, which shall comply with the requirements of 4.2 of this standard. 5.3 Accuracy
Select three standard buffer solutions, use two of them for calibration, and measure the third solution. Its accuracy shall comply with the requirements of 4.3 of this standard. 5.4 Stability test
Perform according to JB/T6858 and shall comply with the requirements of 4.4 of this standard. 5.5 Repeatability test
When the instrument is running in the positive belt and other operating conditions remain unchanged, the electrode is taken out and put in the same standard solution six times, and its repeatability error shall comply with the requirements of 4.5 of this standard.
5.6 Response time test
When the instrument is running normally and the electrode insulation resistance is ≥100MQ, the response time from the sample solution to 90% of the indicated final value is no more than 10S.
5.7 Environmental temperature influence test
HG/T3125-1998
Put the converter in a temperature control box, and let the temperature drop from room temperature to 0℃, keep it for 2h, and then raise it to 40℃, keep it for 2h, and the temperature rise (fall) rate is 10C/h, which should meet the requirements of 4.7 of this standard. 5.8 Environmental humidity change influence test
When the instrument is running normally and the temperature is kept at room temperature, put the converter in a humidity control box, and let the display change from 45% to 90%, and the reading change should meet the requirements of 4.8 of this standard. 5.9 Test on the influence of power supply voltage change
When the device is under normal working conditions, when the output voltage of the safety barrier changes within the range of 24±2.4VDC, the indication of the device shall meet the requirements of 4.9 of this standard.
5.10 Insulation resistance test
When the device is in non-working state, connect one end of the 500V megohmmeter to the power terminal and the other end to the housing, add 500V DC voltage, and measure the insulation resistance of the instrument after 5S, which shall meet the requirements of 4.1D of this standard. 5.11 Instrument insulation dielectric strength test
Under the condition of ambient temperature of 0~40℃ and ambient humidity ≤90%, apply 500V voltage (AC) with a frequency of 50±1Hz between the power terminal of pH converter and the external light. After 1min withstand voltage test, it shall meet the requirements of 4.11 of this standard. 5.12 Anti-interference test
AC and DC magnetic field interference!
Under normal operation of the instrument, apply external magnetic field interference with a magnetic field strength of 400A/m, and apply it for 10nim at the most unfavorable position. It shall meet the requirements of 4.12 of this standard.
5.13 Vibration test
Under normal operation of the instrument, fix the whole machine on the vibration table, and vibrate it for 25 seconds under the condition of vibration of ±0.1mm and frequency of 20H2. It shall meet the requirements of 4.13 of this standard.
5.14 Continuous impact test
Perform according to JBY002 and shall meet the requirements of 4.14 of this standard. Note: When there is no condition to perform continuous impact test, the automobile transport test can be used instead. 5.15 Maximum surface temperature test
Perform according to GB3836.1 and shall meet the requirements of 4.15 of this standard. 5.16 Input impedance
Perform according to the requirements of JB/T6858 and shall meet the requirements of 4.16 of this standard. 5.17 Input current
Perform according to the requirements of JB/T6858 and shall meet the requirements of 4.17 of this standard. 5.18 Alternating damp heat test
Perform according to the requirements of GB2423.4 for high temperature of 40C and a cycle of 2 days. The change in readings shall meet the requirements of 4.8 of this standard, and the insulation dielectric strength shall meet the requirements of 4.11 of this standard. 6 Inspection rules
Inspection is divided into factory inspection and type inspection. 6.1 Factory inspection
6.1.1 Each instrument must be inspected and qualified by the inspection department of the manufacturer and accompanied by a product certificate before it can leave the factory. 6.1.2 The factory inspection items include: 4.1, 4.2, 4.3, 4.4.4.5.4.6.4.9.4.10, 4.16 of this standard. 6.2 Type inspection
6. 1 Type inspection shall be conducted in any of the following situations: b) New product trial production or trial production of transferred factory production; b) When changes in product design, process or materials used may affect product performance; c) When production is resumed after stopping production for more than one year; d) Periodic inspection of normal production of instruments, generally 2 years; d) When there is a significant difference between the factory inspection results and the last type inspection; d) When the national technical supervision and safety supervision agencies deem it necessary. 6.2.2 The items for type inspection of instruments include all items in Chapter 4 of this standard, and shall be conducted in accordance with the test methods in Chapter 5. 6.2.3 The type inspection shall be conducted by randomly selecting products from those that have passed the factory inspection, with the number of products not less than 2. If there are any unqualified products, they shall be retested. If they are qualified in the retest, the remaining products except those that failed the initial test shall be considered qualified. If there are still unqualified items after repeated testing, the type inspection shall be considered unqualified. At this time, production shall be stopped, the reasons shall be analyzed, solutions shall be proposed, and effective measures shall be taken until the new type inspection is qualified before production can be resumed. 7 Marking, packaging, transportation
7.1 Marking
The obvious part of the instrument body should have a permanent red embossed explosion-proof mark "Ex". The nameplate should have the following items: a) Product name and model; b) "Ex" mark on the upper right; e) Explosion-proof grade; d) Explosion-proof certificate number 1; related equipment; f) product number; g) manufacturing date; h) manufacturer.
7.2 Packaging
7. 2.1 The outer layer is made of wooden box or tile skirt paper box, and the inner layer is made of foam plastic soft packaging. Only the instrument itself is covered with a polyethylene bag. The instrument and its accessories are packed in good condition and should meet the requirements of water, land and air transportation. 7.2.2 The packing includes: pH sensor, pH converter, and the following documents: a) Packing list, b) Product certificate: e) Product instruction manual d) Spare parts and missing parts list. 7.2.3 The packing box should have the following contents: 2) Product name and model; b) Product name and model; c) Product name and model; e) Product instruction manual; d) Spare parts and missing parts list. ) Manufacturer name;
c) Overall dimensions and gross weight:
d) Implementation standard number:
e) "Upward", "Handle with care", "Precision instrument", "Moisture-proof" and other words and corresponding patterns. 7.3 Transportation
The instrument should be transported by conventional transportation vehicles. It should not be subjected to strong bumps and impacts during transportation, and should be protected from rain and snow. The instrument should be stored in a warehouse with an ambient temperature of 0~40℃ and a relative humidity of no more than 90%. The warehouse should be kept dry, well ventilated, and free of corrosive gases and corrosive chemicals.
People's Republic of China
Chemical Industry Standard
Technical Parts of Explosion-proof Industrial pH Meter
JIG/T3125—1998
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology Printing Factory
All rights reserved. No reproduction allowed
Format 880×12301/16 Printing Sheet 0.75 Words 12,000 Words First Edition September 1998 First Printing September 1998 Printing Quantity 1-100
W.8681 Marking
The obvious part of the instrument body should have a permanent red embossed explosion-proof mark "Ex". The nameplate should have the following items: a) Product name and model; b) "Ex" mark on the upper right; e) Explosion-proof grade; d) Explosion-proof certificate number 1; related equipment; f) product number; g) manufacturing date; h) manufacturer. 7.2 Packaging
7.2.1 The outer layer is made of wooden box or tile skirt paper The box is made of foam plastic soft packaging. Only the instrument itself is covered with a polyethylene bag. The instrument and its accessories are packed in good condition and should meet the requirements of water, land and air transportation. 7.2.2 The packing includes: pH sensor, pH converter, and the following documents: a) Packing list, b) Product certificate: e) Product instruction manual d) Spare parts and missing parts list. 7.2.3 The packing box should have the following contents: 2) Product name and model; b) Manufacturer's name; tt||c) Overall dimensions and gross weight:
d) Implementation standard number:
e) Words such as "upward", "handle with care", "precision instrument", "moisture-proof" and corresponding patterns. 7.3 Transportation
The instrument shall be transported by conventional means of transport. It shall not be subjected to strong bumps and collisions during transportation, and shall be protected from rain and snow. The instrument shall be stored in a warehouse with an ambient temperature of 0~40℃ and a relative humidity of no more than 90%. The warehouse shall be kept dry, well ventilated, and free of corrosive gases and corrosive chemicals.
People's Republic of China China
Chemical Industry Standard
Technical Parts of Explosion-proof Industrial pH Meter
JIG/T3125—1998
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology Printing Factory
All rights reserved. No reproduction allowed
Format 880×12301/16 Printing Sheet 0.75 Words 12,000 Words First Edition September 1998 First Printing September 1998 Printing Quantity 1-100
W.8681 Marking
The obvious part of the instrument body should have a permanent red embossed explosion-proof mark "Ex". The nameplate should have the following items: a) Product name and model; b) "Ex" mark on the upper right; e) Explosion-proof grade; d) Explosion-proof certificate number 1; related equipment; f) product number; g) manufacturing date; h) manufacturer. 7.2 Packaging
7.2.1 The outer layer is made of wooden box or tile skirt paper The box is made of foam plastic soft packaging. Only the instrument itself is covered with a polyethylene bag. The instrument and its accessories are packed in good condition and should meet the requirements of water, land and air transportation. 7.2.2 The packing includes: pH sensor, pH converter, and the following documents: a) Packing list, b) Product certificate: e) Product instruction manual d) Spare parts and missing parts list. 7.2.3 The packing box should have the following contents: 2) Product name and model; b) Manufacturer's name; tt||c) Overall dimensions and gross weight:
d) Implementation standard number:
e) Words such as "upward", "handle with care", "precision instrument", "moisture-proof" and corresponding patterns. 7.3 Transportation
The instrument shall be transported by conventional means of transport. It shall not be subjected to strong bumps and collisions during transportation, and shall be protected from rain and snow. The instrument shall be stored in a warehouse with an ambient temperature of 0~40℃ and a relative humidity of no more than 90%. The warehouse shall be kept dry, well ventilated, and free of corrosive gases and corrosive chemicals.
People's Republic of China China
Chemical Industry Standard
Technical Parts of Explosion-proof Industrial pH Meter
JIG/T3125—1998
Editor China National Chemical Equipment Corporation
Postal Code 100011
Printer Beijing University of Chemical Technology Printing Factory
All rights reserved. No reproduction allowed
Format 880×12301/16 Printing Sheet 0.75 Words 12,000 Words First Edition September 1998 First Printing September 1998 Printing Quantity 1-100
W.868
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