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Trial verification procedure for zirconia oxygen analyzer
JJG535—1988
Trial verification procedure for zirconia oxygen analyzer
Verificuthyt Kegufatfon u
Zlrennin Oxygen Analyxris
JJt:535-1988
This standard was approved by the State Metrology Commissioner on February 6, 1999 and effective from January 1, 1999. Responsible unit: Zhejiang Provincial Bureau of Measurement and Basic Research
Drafting unit: Zhejiang Provincial Bureau of Measurement and Basic Research
Technical department of this standard can interpret the main drafters of this standard:
Jiao Yizu: (Ningyou Standard Tour Beiwang Bureau)
Camp drafter:
Shen Yong (Ningbo Metrology Bureau;
Zhou Duli (Nanjing Dilan Analytical Instrument Factory) 1468
Technical requirements
Completed cases
Internal inspection items and inspection methods
Handling of inspection results
Appendix 1 Receiver loss performance test equipment small picture Xie Cheng? Response time, basic level difference Appendix: Schematic diagram of calibration device, attached: calibration diagram of wet device, attached: calibration record
Trial calibration procedure for oxidized oxygen analyzer
This standard is used for the calibration of newly manufactured and used oxidized oxygen analyzer (hereinafter referred to as instrument). The instrument has a minimum range of [(: maximum range of 25%--Description
Oxidized oxygen analyzer measures the actual quantity of industrial furnaces: quantitative analysis in industrial production processes and environmental protection, and its working principle is as follows: After adding a certain stabilizer to the oxidized material, it is calcined at high temperature and electrolyzed into oxygen at a certain salinity: in the material, the two electrodes are plated with platinum. When the oxygen partial pressure between the two sides is different, the two electrodes can produce some good results, and the field becomes a different cell. The bipolar reaction is as follows: high rate - example: (3-420)-
external period: 20 2 +0 -4(
Condensed potential theory value conforms to the equation of gas science
China gas affairs
1 direct conversion:-heat, 3 proof
4 heat value: 5 measurement tube control will kidney:
Wu Zhong: RGas constant:
FFaraday constant;
T--absolute temperature of battery:
The electric effect of one plus reaction:
-… meal ratio gas partial pressure:
Force--measured gas has:
Electromotive force of concentration difference cell
Thus, if the temperature of oxygen concentration cell and zero ratio gas oxygen partial pressure are known, the oxygen content of the measured gas can be quickly obtained by measuring the small electromotive force. The structural principle diagram is shown in Figure 1. 2 Technical requirements
! External working performance inspection
1.1 The instrument should be accompanied by the technical instructions of the manufacturer and complete the attachments; indicate the manufacturer's name, instrument model, serial number and manufacturing year and month: each switch, rotary switch and display should have the correct function mark. 1.2 The whole set of instruments should be intact and there should be no movement phenomenon. 1.3 After the instrument is powered on and vented, all parts can work normally, and the regulator should be properly adjusted and the display should show the measured value clearly and stably.
1 Insulation
The insulation value between the power supply of this device (including the equivalent circuit) and the device is not less than 2M1
3 Protective earth performance
There should be a protective earthing meter with a clear connection method, and the contact resistance should not exceed U.10. The grounding wire of the device should be connected to the grounding terminal of the other line to the instrument. The resistance should not exceed 21:140
4 Deep solid resistance
Under 758+5: working temperature, the resistance between the two oxides should not be greater than 2: for new devices. When the oxygen content of the instrument changes greatly, the instrument only refers to % of the verified value. The verification time should not exceed the manufacturer's specifications, and the error should not exceed 31% under the specified control conditions. The deviation between the standard value and the actual measurement accuracy should not exceed % under the specified calibration conditions. Under the specified calibration conditions, the instrument is calibrated for 4 hours. 1 The specified value of the measurement result shall not exceed 2% of the basic requirement. Under actual different network conditions, the same measured gas property shall be measured 6 times. The final repeatability shall not exceed the basic error limit of [2]. The influence of power supply voltage fluctuation shall be +11% of the rated value. The auxiliary equipment caused by the change of central pressure shall not exceed 12% of the original reading.
Three calibration items
10 Environmental requirements
10.1 Air condition
Vibration temperature: 15-25℃;
Relative humidity (45-80%):
6.-.0ka
10.2 Eliminate electrical interference from the instrument. 10.3 The test chamber should be well ventilated and free from any gases that may affect the accuracy of the calibration. 10.4 There should be no organic combustion or vibration
11 Power supply
Electric seat: 220:2.2V
Rated frequency: 0.511Hz
12 General provisions for calibration
12.1 The instrument to be tested and the appropriate air source should be stored in an environment that meets the requirements of Article 10 for more than 4 hours. 12.2 The amount of gas to be measured shall be determined by the manufacturer, such as 300m3/mn at the special point, but the fluctuation of the secretion shall not exceed +50ml/min. 12.3 During the whole calibration process, clean air shall be used as the vertical ratio gas. 13.1 Standard oxygen-containing mixed gas: The concentration of the components shall be accurate and shall not exceed 1/2.5 of the error of the instrument being adjusted. The gas samples can be selected: (1) Standard clean mixed gas prepared by the weight method according to the national standard (B5274-1985 Gas Separation Institute-Standard Gas Preparation Method) or standard gas approved by the national metrology department; (2) Standard hydrogen and oxygen source gas of the gas standard generator: Reference type: 1X>09 type gas carrier standard Generator. 149:
1.2 Gas reduction time and pressure gauge used with gas bottle. 13.3 Gas comparison: wall thickness 21m
13.4 Gas flow rate verification
Accuracy: not lower than 2.5 level:
Volume pool,
Nominal diameter: 54mm
Gas flow rate verification
Accuracy: not lower than 2.5 level: | ... : Accuracy level 1.
Regulator: 0-250V, 50H
and temperature measurement and control instrument: product temperature is not lower than 0, the difference does not exceed the above four calibration items and calibration methods
14 External standard T-type test bench
According to the requirements of 1.1: 1.2, 1.3, reverse daily measurement and inspection 15 Ground resistance measurement product
Use the megohmmeter with a DC ratio of 5HIV to measure the insulation voltage of the specified part. 16 Ground protection can be calibrated
According to the appendix! According to the line diagram, the output voltage of the transformer is reduced to 6V, and the variable resistor is used to keep the current (1) at 10A. The electronic self-voltage meter measures the voltage drop between the two circuits of the measured part [V). The contact resistance or the user group of the grounding key ( R) is calculated as follows: R
17 Probe internal resistance
17.1 Place the probe under the specified temperature and heat it to 15 rms. Then pass 5% nitrogen gas into the probe. When the back pressure indicator is stable, record the reading. 17.2 Place a potential of about 200 1 at both poles of the probe. Adjust the potential so that the resistance value is half of the original one. Then set the value to the connection part between the potentiometer and the probe. Subtract the lead resistance value. The value is the internal resistance of the probe under test. The test circuit is shown in Figure 2.
18 Verification of the probe
18. According to the attached figure, the test system is connected. The total length of the gas path from the gas source to the probe is 2:m. The gas path is made of 2mm stainless steel. The gas sample conversion should be flexible. Adjust the instrument to make it work normally. 18.2. Pass the oxygen-containing gas through the inner side of the oxygen probe at a flow rate of 3 ml/min. The change in oxygen content should not be less than 13% of the maximum display value of the entire measuring instrument. Turn the air exchange dial and use the sand to measure the time from the start of the screening to the inferred content of % indicated by the instrument:
19. Verification of the instrument
19.1 See Appendix 2 for a schematic diagram of the calibration system
19.2 Selection of calibration points and sequence
19.2.1 The basic calibration points of the instrument should be at least 3 points. Generally, 3 points around 15%, 51%, and 85% of the full scale value should be selected. For other ranges, at least 2 points (up to 20% of the full scale value) should be selected.
The points should be determined in the order of low point to high point or low point. 19.2.2
In this specification, the calibration points are divided into 3 points. This test is to be completed under the specified test conditions. Turn on the test system, power on, and make the whole test system in normal operation. After stabilization (stabilization time is not less than 4 hours), complete the test point by point. 19.4 Remote test indication error. Follow the manufacturer's specifications. 19.4.2. The probe battery is adjusted. N: F1; Vm, R1M. Pass a standard mixed gas with a known oxygen content through the test. After the instrument value is stable, perform a point-by-point test according to 19.4.2. Once the value is stable, calculate the error using the following formula: A - 1 × 300%
In the process: A.—-Instrument indication:
Ah·Standard annual oxygen content of the gas;
A.——The average full-section value of the basic process to be tested.
.4.4 For instruments that do not have heating and temperature control systems for hydrogenation junction probes, a dedicated blast furnace and its humidity control and temperature measurement device should be equipped, and a dedicated gas guide should also be equipped. See Appendix 3 for the diagram. 20 Stable calibration
1 In the entire calibration process of this item, the calibration environment should be: △5, gas change 31, inflation humidity change 10%, voltage change 2V, gas flow fluctuation +1ml/min.
20.2 Adjust the instrument to normal working state, the gas is clean air, mixed with oxygen at 50% of the full value, ventilate for 41. Start to record the readings and use the recorder to continuously record the instrument indication (record once every 5 minutes). 20.3 Continuous calibration 41. During the entire calibration process, any regulator that affects the indication shall not be adjusted Calculate the stability of the instrument according to the following formula:
the full scale value of the measurement range;
the average value of the readings:
the full scale value of the measurement range;
the average value of the readings for the instrument.
21.1 Pass the gas with a standard oxygen mixture containing about 50% of the full range of the instrument. When the instrument indication stabilizes to 5mm, lower the instrument indication.
21.2 Pass the gas once every 10m, and measure 6 times in total. Then calculate the repeatability of the instrument according to the following formula: IS A,-AY
Xiao readings;
The average value of the readings:
The full scale value of the measured quantity;
Number of readings,
22 Calibration of the circuit voltage fluctuation
22,1 The instrument is in normal working state and stably indicates the oxygen or oxygen content of the measured gas, record the indication, ()
22.2 Adjust the voltage of the instrument sample, so that it changes within the range of rated voltage =%: monitor the display directly. According to the formula, the additional error caused by the plate
In the formula: Ai-
Instrument indication value when the rated voltage is far away:
Instrument indication value when the rated voltage is not exceeded:
An--
Calibration value
V. Handling of calibration results
25 The calibration certificate shall be issued for the instruments that have been calibrated according to this regulation. If the result is not in compliance with the consultation, the notice of the given result shall be issued. If the result is not in compliance with the consultation, the ball mouth shall not be determined.
24 The calibration cycle is not uniformly stipulated. Only the oxide junction of the gear shall be replaced with a new one. If there is any doubt about the measurement result, the calibration shall be carried out.
Appendix 1 Schematic diagram of the grounding performance test of the instrument
T, one adjustment device: 5-microcontroller, nuclear ground wire: T, diagram: transformer! Device: A-handover certificate &, ruler, call: one electric: one installation:! Good 4$4
Device name
Out, 'No.
Take time and room temperature
Appendix 2 Schematic diagram of response time and basic error verification device*
[一: Calibration head, 3
System: 5—National: .7—National: 8—Full 1
Appendix 3
External control benefit pre-installation verification diagram
1-Hua: 2-P fast:-Thermal protection: 4-Thermoelectric example: 5 Measuring surface humidity (Table: 6 Products are shown; Hungry quantity: 9—approximate current; 9—general quantity Energy saving: [—
Appendix 4 Verification record
1. External performance inspection
3. Protection control fiber
4. Probe battery inner ringbZxz.net
6. Individual error
Atmospheric odor
Test report
7. Five-component verification
Measurement economy
R. Stability
4.H withstand voltage, reverse wave effect verification
Receiver indication
1.1× auxiliary value
Only road indication
Only small place
Age determination period
Standards
Power determination skinAi-
When the instrument is normally away from the rated voltage, the instrument indicates the value:
When the instrument is at a rated voltage, the instrument indicates the value:
An-—
Calibration value
5. Handling of calibration results
25. The calibration certificate shall be issued for the instruments that have been calibrated according to this regulation. If the instrument does not meet the requirements, a notification letter shall be issued, indicating that the unqualified result has not been determined.
24. There is no unified regulation for the calibration cycle. Only the new oxide junction shall be replaced. If there is any doubt about the measurement result, calibration shall be carried out.
Appendix 1. Schematic diagram of instrument grounding performance test installation
T, one adjustment device: 5-microcontroller, nuclear ground wire: T, diagram: transformer! Device: A-handover certificate &, ruler, call: one electric: one installation:! Good 4$4
Device name
Out, 'No.
Take time and room temperature
Appendix 2 Schematic diagram of response time and basic error verification device*
[一: Calibration head, 3
System: 5—National: .7—National: 8—Full 1
Appendix 3
External control benefit pre-installation verification diagram
1-Hua: 2-P fast:-Thermal protection: 4-Thermoelectric example: 5 Measuring surface humidity (Table: 6 Products are shown; Hungry quantity: 9—approximate current; 9—general quantity Energy saving: [—
Appendix 4 Verification record
1. External performance inspection
3. Protection control fiber
4. Probe battery inner ring
6. Individual error
Atmospheric odor
Test report
7. Five-component verification
Measurement economy
R. Stability
4.H withstand voltage, reverse wave effect verification
Receiver indication
1.1× auxiliary value
Only road indication
Only small place
Age determination period
Standards
Power determination skinAi-
When the instrument is normally away from the rated voltage, the instrument indicates the value:
When the instrument is at a rated voltage, the instrument indicates the value:
An-—
Calibration value
5. Handling of calibration results
25. The calibration certificate shall be issued for the instruments that have been calibrated according to this regulation. If the instrument does not meet the requirements, a notification letter shall be issued, indicating that the unqualified result has not been determined.
24. There is no unified regulation for the calibration cycle. Only the new oxide junction shall be replaced. If there is any doubt about the measurement result, calibration shall be carried out.
Appendix 1. Schematic diagram of instrument grounding performance test installation
T, one adjustment device: 5-microcontroller, nuclear ground wire: T, diagram: transformer! Device: A-handover certificate &, ruler, call: one electric: one installation:! Good 4$4
Device name
Out, 'No.
Take time and room temperature
Appendix 2 Schematic diagram of response time and basic error verification device*
[一: Calibration head, 3
System: 5—National: .7—National: 8—Full 1
Appendix 3
External control benefit pre-installation verification diagram
1-Hua: 2-P fast:-Thermal protection: 4-Thermoelectric example: 5 Measuring surface humidity (Table: 6 Products are shown; Hungry quantity: 9—approximate current; 9—general quantity Energy saving: [—
Appendix 4 Verification record
1. External performance inspection
3. Protection control fiber
4. Probe battery inner ring
6. Individual error
Atmospheric odor
Test report
7. Five-component verification
Measurement economy
R. Stability
4.H withstand voltage, reverse wave effect verification
Receiver indication
1.1× auxiliary value
Only road indication
Only small place
Age determination period
Standards
Power determination skin
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