Some standard content:
ICS13.030.40
Machinery Industry Standard of the People's Republic of China
JB/T10340--2002
Differential pressure controller for bag filter
Differential pressure controller for bag filter2002-07-16 Issued
2002-12-01 Implementation
Issued by the State Economic and Trade Commission of the People's Republic of China
Normative reference documents
Terms and definitions
Basic parameters
Measuring range
Display mode.
Resolution..
Control output,
Normal working environment conditions
Working power supply|| tt||Technical requirements.
Reference working environment conditions
Technical indicators related to accuracy
Technical indicators related to influencing quantity
Safety performance.
Transportation and storage performance
Appearance,
5.7 Function.
Test method
Test environment conditions
Test equipment
Indication basic error
Indication repeatability error
Set point error
Switching point repeatability error|| tt||Stability
Main power supply change
Series mode interference
External magnetic field.
Ambient temperature,
Insulation resistance,
Insulation strength.
6.14Transportation and storage test
6.15Appearance,
6.16Function
Inspection rules,
Factory inspection
JB/T10340-2002
JB/T10340-2002
Type test|| tt||8 Marking, packaging, storage and warranty
8.1 Marking
8.2 Packaging
8.3 Storage
Technical indicators related to the impact quantity
Factory inspection items
Type test items
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This standard is proposed by the China Machinery Industry Federation. Foreword
This standard is under the jurisdiction of the Machinery Industry Environmental Protection Machinery Standardization Technical Committee. The drafting unit of this standard: Shanghai Bag Dust Removal Accessories Co., Ltd. The main drafters of this standard: Chen Jianming, Yuan Haiqing. JB/T10340—2002
1 Scope
Pressure differential controller for bag filter
JB/T10340—2002
This standard specifies the definition, product classification, technical requirements, test methods, inspection rules, marking, packaging and storage of pressure differential controller for bag filter.
2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, the parties who reach an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this standard. GB/T13639-1992 Analog input digital indicator for industrial process measurement and control systems 3 Terms and definitions
The following terms and definitions apply to this standard. 3.1
Differential pressure controller differentialpressurecontroller is a control instrument that receives the signal from the corresponding differential pressure transmitter, compares it with the pre-set parameters of the controller, and has corresponding control output to achieve automatic cleaning of bag dust collector. 3.2
Differential pressure value differentialpressurevalue represents the value of the pressure difference at the sampling points on both sides of the bag dust collector inlet and outlet or flower plate. 3.3
Overpressure alarm value overpressurealamvalue is the setting parameter of the differential pressure controller, which represents the maximum pressure difference value allowed for the controlled bag dust collector to work. 3.4
Upper limit value upperlimitvalue
The setting parameter of the differential pressure controller indicates that when the pressure difference value of the controlled bag dust collector rises to this value, the bag dust collector needs to be cleaned. 3.5
lower limit valuelowerlimitvalue
The setting parameter of the pressure difference controller indicates that when the pressure difference value of the controlled bag dust collector drops to this value, the bag dust collector stops cleaning. 3.6
lower pressure alarm valuebelowpressurealarmvalueThe setting parameter of the pressure difference controller indicates the minimum pressure difference value allowed for the controlled bag dust collector to work. 4 Basic parameters
4.1 Measuring range
Input signal: analog DC signal 4mA~20mA. 4.2 Display mode
4-digit display, the unit of the instrument display value is Pa4.3 Resolution
The last digit.
JB/T10340—2002
4.4 Control output
The output is a contact-type on-off type position control, and the contact capacity is not less than 30VDC, 0.1A (resistive load). 4.5 Normal working environment conditions
Temperature 0℃~50℃, relative humidity not more than 85%. 4.6 Working power supply
Voltage: AC220×(1±10%)V, frequency: 50×(1±5%)Hz. 5 Technical requirements
Reference working environment conditions
a) Ambient temperature: (20±2)℃:
b) Relative humidity: 45%～75%;
c) Atmospheric pressure: 86kPa～106kPa. 5.2 Technical indicators related to accuracy
5.2.1 Indication basic error
The indication basic error limit of the instrument is: ±(1.0%FS+1d)Where:
The range of the instrument:
-The value represented by the last digit of the display.
5.2.2 Indication repeatability error
The indication repeatability error of the instrument shall not be greater than 0.25%FS. 5.2.3 Set point error
The set point error limit of the instrument is ±(1.0%FS+1d). 5.2.4 Switching point repeatability error
The switching point repeatability error of the instrument shall not be greater than 0.5%FS. 5.2.5 Stability
5.2.5.1 Short-term indication drift
After the instrument is powered on for 15 minutes, after pre-adjustment, the indication drift within 1 hour shall not be greater than 1/4 of the indication basic error. 5.2.5.2 Continuous operation
After the instrument has been in continuous operation for 24 hours, the indication basic error, set point error and switching difference shall all meet the requirements of 5.2.1, 5.2.3 and 5.2.4 of this standard.
5.2.6 Fluctuation
The fluctuation of the instrument should not exceed 3d.
5.3 Technical indicators related to influencing quantities
When each influencing quantity changes within the working condition range, the change of the indication value and the change of the switching value should not exceed the provisions of Table 1. Table 1 Technical indicators related to influencing quantities
Influencing quantity
Main power supply change
Series mode interference
External magnetic field
Ambient temperature
Technical indicators
Average change of 10℃
5.4 Safety performance
5.4.1 Insulation resistance
JB/T10340—2002
Under the conditions of ambient temperature of (15～35)℃ and relative humidity of 45%～75%, the insulation resistance between the power supply, input, output and grounding terminals of the instrument should not be less than 20MQ. 5.4.2 Insulation strength
Under the condition of ambient temperature of (15～35)℃ and relative humidity of 45%～75%, a test voltage of 1.5kV is applied between the power supply, input, output and ground terminals of the instrument for 1min, and no breakdown or arcing should occur. 5.5 Anti-transportation and storage performance
The instrument is tested in simple packaging. 5.5.1 Low temperature
The instrument shall be able to withstand the low temperature transportation environment test of -25℃. After the test, its basic indication error and set point error shall still meet the requirements of 5.2.1 and 5.2.3 of this standard.
5.5.2 High temperature
The instrument shall be able to withstand the high temperature transportation environment test of +55℃. After the test, its basic indication error and set point error shall still meet the requirements of 5.2.1 and 5.2.3 of this standard.
5.5.3. Heat and humidity
The instrument shall be able to withstand the transportation environment test of temperature (40 ± 2) °C and relative humidity of 91% to 95%. After the test, its basic error and set point error shall still meet the requirements of 5.2.1 and 5.2.3 of this standard. 5.5.4. Continuous impact
The instrument shall be able to withstand the impact test of acceleration (100 ± 10) m/s2, pulse frequency (60~100) times/min, and continuous collision number (1000 ± 10) times. After the test, its basic error and set point error shall still meet the requirements of 5.2.1 and 5.2.3 of this standard. 5.6. Appearance
The surface of the instrument shall not be scratched, dirty, deformed or damaged. The signs, words and symbols on the instrument panel or nameplate shall be clear and distinct, and shall not be incomplete or dirty. After the instrument is powered on, the displayed reading shall be clear, the brightness shall be uniform, and there shall be no missing pens. 5.7 Function
5.7.1 The instrument shall have the following parameter setting functions: overpressure alarm value, upper limit value, lower limit value, and low pressure alarm value. The set parameters shall still be saved after power failure.
5.7.2 It shall have the signal output functions of "work" and "alarm" relay contacts. 5.7.3 It shall have the function of manually controlling the "work" output. 5.7.4 Control function:
a) Overpressure alarm value ≤ measured value: "work" and "alarm" output. b)
Upper limit value ≤ measured value < overpressure alarm value: "work" output. Lower limit value < measured value < upper limit value: "work" signal maintains the original state. c
Low pressure alarm value < measured value ≤ lower limit value: "work" stops output. d)
Measured value ≤ low pressure alarm value: "alarm" output. 6 Test method
6.1 Test environment conditions
Reference working conditions.
Power supply of the instrument: voltage variation shall not exceed 1% of the rated value; frequency variation shall not exceed 1% of the rated value. Except for the geomagnetic field, there is no external magnetic field that affects the normal operation of the instrument. 3
JB/T10340—2002
6.2 Test equipment
The total uncertainty effect of the standard instrument used for the test, including the entire calibration equipment, shall be less than 1/5 of the allowable error of the instrument under test. 6.3 Basic error of indication
Increase the input signal from the lower limit (upward stroke), input the nominal power value corresponding to the pressure difference value of each point under test to the instrument, and read the corresponding indication value of the instrument until the upper limit: then reduce the input signal (downward stroke), input the nominal power value corresponding to the pressure difference value of each point under test to the instrument, and read the corresponding indication value of the instrument until the lower limit. The lower limit value is only calibrated for the lower stroke, and the upper limit value is only calibrated for the upper stroke.
6.3.1 The instrument must be powered on for 15 minutes before the test. 6.3.2 The test points shall be selected from any 5 points within the measuring range and evenly distributed. 6.3.3 The instrument shall be tested for at least 3 cycles within the entire measuring range, with the upper and lower strokes being - cycles, and the maximum value between the 3 times shall be taken to determine.
6.3.4, the calculation formula for the basic indication error is: AA=Ad-A
Wherein:
AA basic indication error, unit is Pa:
A instrument display value, unit is Pa
A, the nominal value corresponding to the tested point, unit is Pa. 6.4 The indication repeatability error
and the indication basic error shall be carried out simultaneously, and the maximum difference between the 3 test points on the same stroke shall be taken to determine. 6.5 Set point error
6.5.1 Set point error
The set point error shall be tested at the set points near 10%, 50%, and 90% of the instrument range. 6.5.2 Upper limit set point error
Increase the input signal so that the displayed value slowly approaches the set value. When the output state changes, the reading instrument indicates the value. The calculation formula is AS, = a-sp
Where:
Set point error, unit is Pa:
is the average value of the reading instrument indicated value when the output state changes in the upper stroke, unit is Pa: The nominal value corresponding to the set point, unit is Pa. 6.5.3 Lower limit set point error
Reduce the input signal so that the displayed value slowly approaches the set value. When the output state changes, the reading instrument indicates the value. The calculation formula is: S2=Pa2-Ps
Where:
is the average value of the reading instrument indicated value when the output state changes in the lower stroke, unit is Pa. 6.5.4 Overpressure alarm value, underpressure alarm value set point error (3)
Increase the input signal to make the displayed value slowly approach the set value. When the output state changes, the meter reads the indicated value: Reduce the input signal to make the displayed value slowly approach the set value. When the output state changes, the meter reads the indicated value. The calculation formula is: AS = (Pai + Pa2) / 2-Psp
6.6 Switching point repeatability error
Conducted simultaneously with the set point error, take the maximum difference between the three times on the same stroke to determine 4
6.7 Stability
JB/T10340-2002
6.7.1 Short-term indication drift
After the meter is powered on for 15 minutes, input the electrical quantity corresponding to 50% of the range, and the meter reads the value po. After that, measure once every 10 minutes (the measured value p is the average value of 5 instrument readings within 1 minute), for 1 hour, and take the value with the largest absolute value of the difference between p and po as the short-term indication drift value of the instrument.
6.7.2 Continuous operation
Input a signal of 80% of the range to the instrument. After continuous operation for 24 hours, measure the basic indication error of the instrument at 20% and 80% of the range.
6.7.3 Fluctuation
Perform according to the relevant provisions of 6.4.2 of GB/T13639--1992. 6.8 Change of main power supply
Measure and read the changes of indication value and switching value according to the test method of 6.3.2 of GB/T13639-1992. 6.9 Cross-mode interference
Perform according to the relevant provisions of 6.3.4 of GB/T13639-1992. 6.10 External magnetic field
Perform the test in accordance with the relevant provisions of 6.3.6 of GB/T13639-1992. 6.11 Ambient temperature
Perform the test in accordance with the relevant provisions of 6.3.7 of GB/T13639-1992. 6.12 Insulation resistance
Perform the test in accordance with the relevant provisions of 6.5.1 of GB/T13639-1992. 6.13 Dielectric strength
Perform the test method in accordance with 6.5.2 of GB/T13639-1992. 6.14 Anti-transportation and storage test
Perform the test method in accordance with 6.8 of GB/T13639-1992. 6.15 Appearance
Perform the test by visual inspection.
6.16 Function
Inspect according to the requirements of 5.7 of this standard.
7 Inspection rules
Factory inspection
Each instrument must be inspected by the quality inspection department of the manufacturer. It can only be shipped after passing the inspection and accompanied by a product certificate. The items of factory inspection are shown in Table 2.
Table 2 Factory inspection items
Basic error of indication
Set point error
Short-term indication drift
Continuous operation indication drift
Insulation resistance
Dielectric strength
Technical requirements Article number
Test method Article number
JB/T10340-2002
Type test
The instrument type test should be carried out according to the items in Table 3. In one of the following situations, a type test should be carried out. 7.2.1
Test type identification of new products or old products transferred to the factory: After formal production, if there are major changes in structure, materials, and processes that may affect product performance: Product quality is unstable or the product is suspended for a long time (more than half a year) to resume production: During normal production, type tests shall be conducted at least once every 3 years. d)
The number of samples for each type test is 3. Except for the identification, samples shall be randomly selected from the products that have passed the factory inspection, and the number of samples provided each time shall not be less than 10. 7.2.3
In the type test, if a product has one main item or two sub-items unqualified, double sampling should be carried out in the same batch of products, and the unqualified items should be re-tested. If they are still unqualified after re-testing, the batch of products shall be judged as unqualified. Table 3 Type test items
Indication basic error
Indication repeatability error
Set point error
Short-term indication drift
Continuous operation
Insulation resistance
Insulation strength
Switching point repeatability error
Main power supply change
Shen mode interference
External magnetic fieldwwW.bzxz.Net
Ambient temperature
Continuous impact
Packaging, storage and warranty
Marking,
8.1 Marking
Technical requirements Article number
The following markings shall be on the instrument panel or nameplate: a) Product name and model;
Measurement unit name:
Measurement range of electrical quantity:
d) Manufacturer name or trademark:
Test method Article number
Project level
Product number and manufacturing year and month;
Marking of the wiring terminal connected to the external circuit: f)
Standard number for the production of the product.
8.2 Packaging
JB/T10340—2002
The instrument shall be packaged in a sealed bag and packed in a sturdy box that is dustproof, shockproof and moisture-proof together with accessories, spare parts, technical instructions, product certificate and packing list.
8.3 Storage
The instrument should be stored in a well-ventilated room with an ambient temperature of 5℃～40℃ and a relative humidity of no more than 85%. The air should not contain harmful impurities and gases that may corrode the instrument.
8.4 Warranty
If any quality problems occur within 18 months after the product leaves the factory, it can be sent to the manufacturer, who will be responsible for free repairs. 7
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