Some standard content:
National Metrology Verification Standard of the People's Republic of China JJG945-1999 Gas O, Analyxr with Galvanic Cell Issued on May 6, 1999 Implementation on September 1, 1999 Issued by the State Administration of Quality and Technical Supervision JJG 945-1999 Verification Regulation of Gas Oxygen Analyzer with Galvanic Cell JJG 945-1999 This standard was approved by the State Administration of Quality and Technical Supervision on May 6, 1999 and implemented on September 1, 1999 It will be implemented from September 1, 2009. Responsible unit: National Physical and Chemical Metrology Technical Safety Committee Drafting unit: National Standard Material Research Center Entrust the National Physical and Chemical Metrology Technical Safety Committee to interpret this regulation Main drafters: JJG9451999 Yu Dengfu (National Center for Standard Material Research) Participating drafters: Wang Linzhen (National Center for Standard Material Research) Li Chunying (National Center for Standard Material Research) Han Qiao (National Center for Standard Material Research) Technical requirements Verification conditions 4 Verification items Date and time Lai Yanli 5 Verification result processing and verification validity period A Verification record format J3C 945—1999 Xie Shuiqiu Verification certificate Verification result notification format JJG 945—L999
Calibration Procedure for Gas Oxygen Analyzers by Galvanic Cell Method This procedure applies to the calibration of newly manufactured, in-use and post-processed gas oxygen analyzers by galvanic cell method with a range of (0~1000) l/rwl.
1 Overview
Gas oxygen analyzers by galvanic cell method (hereinafter referred to as instruments) are produced by the reaction of oxygen in galvanic cells in the presence of alkaline electrolytes (solid or fuel electrolytes). Within a certain concentration range, the oxygen content is proportional to the generated current. The current can be converted into potential through a negative resistor and recorded by a recorder. The instrument has a gas path system, a detection system (galvanic cell) circuit control system 2 Technical requirements
2.1 Appearance and working belt inspection
2.1.1 The instrument should be marked with the following identification: instrument name, manufacturer name, (Mc mark, instrument model, production number and year of manufacture, each ring, knob, and indicator should have a clear function mark. 2.1.2 The original battery should be intact, strictly sealed, and can work normally. 2.1.3 The electrode lead wires should be reliably connected, and the fasteners should not be stretched or loose. 2.1.4 After the instrument is ventilated and powered on, all parts work normally, all regulators can be adjusted normally, and the display should clearly and steadily show the minimum measured value:
2.1.5 Sensitivity adjustment The adjustment range should have a large margin. If the adjustment is very small or cannot reach the preset value, it is considered that the primary battery fuel cell has failed and must be cleaned, regenerated and replaced: 2.2 Main technical indicators
2.2.1 Residual current
When the instrument is subjected to the specified calibration conditions, the zero value error caused by the electrode residual current should not exceed 1% of the full scale value:
2.2.2 Response time
When the oxygen content of the measured gas changes, the time required for the instrument indication to stabilize at the oxygen content% should generally not exceed 60
2.2.3 Basic error
The instrument group is passed through the specified calibration conditions. After the standard gas is introduced, the ratio of the difference between the measured value and the standard value to the full width of the test range shall not exceed ± (3%-5%), and the basic error of the measured value below 10 mol/mal shall not exceed ±1. 2.2.4 Stability
2, 2.4.1 Zero drift
In the small range of the instrument, pass the standard gas with the required content and record it continuously for 4 hours. Take the maximum drift value in the measured value as the zero drift: its value should not exceed 1/3 of the basic error of the instrument. 2.2.4.2, Span drift
In the minimum range of the instrument, pass the standard gas with the required content and record it once every half an hour for 4 hours. 1
IIG: 945—1990
, and measure the drift towards the maximum drift value. 12.2.5 Review of performance
Under a given period of time, the instrument can be tested for 6 years and the measurement rate shall not exceed 1% of the basic error. 2.2.6 The voltage change in the medium voltage within a specified period of time shall not be greater than the basic error. 3 Verification conditions
3.1 Environmental components
3.1.1 Ambient temperature: (15-.4)
3.1.2 Relative humidity: 80°C
31. Atmospheric air: (.10)K
3.1. The experiment is conducted in a laboratory with good ventilation and there should be no interference from the electric micro-field that affects the verification accuracy. 3.1.6 The instrument and the calibration standard are integrated. They are placed under the above parts for 8 hours before the performance test can be carried out. 3.2 Power supply: (220 2.2) or (1101.[1
Frequency: (50+0.5)Hx
3.3 During the test, the flow rate of the standard gas passing through the instrument is (50-50)1l/mm or as required by the instructions. The annual stability should be <1%.
3.1 Calibration standard gas pressure: (0.01--0.1)a or as required by the instructions 3.5 Zero point gas standard 3.5.1 Standard gas: Zero point gas: High purity nitrogen 9.) Strictly purify with oxygen tube, the oxygen content should be less than .1uml/mcl. 3.5.2 Standard gas: The standard gas for verification must be authentic and have the manufacturing license of the National Quality Supervision Bureau. The content and expansion accuracy are as follows: >[00( jelr]al
0il U olrrol
(99.10)r/o
10 pol/: with F
3.6 Gas Forest Reduction Edition
0 Long Standard Gas: This starts from three 1.0
0 Standard Gas Level: No more than =3%bzxZ.net
Standard Gas: Six exceeds +
Standard Gas: No more than one 10
Polymerize with stainless steel trap diffusion type integrated prison pressure energy, no small leakage, 3.7 Gas Cup Flow Number
All passed the calibration by the meter calibration machine.
Uncertainty: ≤1.0%
3.8 Gas Rate Pipeline
To Range: (-0)/min
ITG 945--159
Use a light .5m or (x1 stainless steel pipe:
3.9 stopwatch
division value is 0.13, belt length is measured and the inspection is: 4 inspection items and inspection methods
4.12 Observation and 1. Make a positive belt inspection
Connect according to the requirements of 2.1;
4.2 Residual current sinking inspection
+.2.1 Connect the inspection gas schematic diagram and connect the inspected instrument (see Figure: 1)0
Figure 1 1--effective point,
2: Liu;
4-energy plan:
5-standard gas: 1-3 gas: 7-cheng: 8-out of position: 4.2.2 Adjust the instrument to zero point, so that the instrument indicates 0.0H0--pass gas, adjust to the appropriate current, and conduct strict leakage inspection on the entire circuit, set the highest gear, and after the instrument is stable, use the residual current to reach the seasonal value. The error shall not exceed 1% of the full scale.
4.3 Time verification
Only when the instrument is working properly, first pass the gas through the instrument and flush the gas path. When the instrument indication is stable, replace the standard gas with a content of 60%, read the indication, and then return the same standard gas to the zero point gas flow. After the instrument is stable, start the stopwatch. When the instrument can indicate 90% of the oxygen content of the measured gas, stop the stopwatch. The time read and recorded is the response time. Repeat the measurement 3 times. Calculate the arithmetic mean. 4.4 Verification with basic error
44.1 The basic error verification should be carried out at least 3 points: %, 50%, 8% of the full scale.
T6:9451999
4.2.2.2.2.3.3.4.4.5.5.6.6.7.8.9.10.11.12.13.14.15.16.17.18.19.10.11.12.13.14.16.18.19.10.11.12.13.14.15.16.18.19.10.11.12.13.14 ...3.14.16.18.19.10.11.13.14.16.18.19.10.11.05) MP purges the air path of the device with an appropriate flow rate (3) minutes, then ventilates and then goes down! When the oxygen meter passes through the gas phase, slowly open the air inlet door of the instrument. After confirming that there is no gas flowing through the bottle, slowly adjust the flow rate to the required level. After the instrument displays a stable state, record the readings. 4.3 Follow the point calibration, reset 2-3 times, and calculate the maintenance time according to formula [1]. 4.5.1 Zero point shift 4.5.2 Cross-E drift 4.5.3 Continuous monitoring instruments need to be calibrated continuously for 24 hours: non-continuous monitoring instruments need to be calibrated continuously for 4 hours, 4. .5.4 Calculate the stability according to formula (2):
-(X-X2/S×100%
or: X--maximum value of reading;
Xrin\-minimum value of reading;
S is the range value of the measurement.
1.6 Repeat the calibration of the measuring range with the standard gas. When the indication is stable, (1)
4.6.2 Stop adding zero gas and pass it through the standard gas. After the indication is stable, read and record the indication:
4.6.3 Pass the standard gas containing about 503% of the range gas under normal conditions, measure 6 times, record the stability value of each time, and calculate the results according to formula (); (X -X)
Where S is the machine efficiency deviation;
the average value of the measured value;
i...the number of measurements, x-6:
the acceptable value of one time:
1.7The influence of power supply voltage fluctuation
×100%
4.7.1 Select the appropriate rate range of the center point of the standard gas content meter, make the instrument work properly, and stably indicate the content of the measured gas, and record the indicated value 40:4.7.2 Use the voltage regulator to adjust the rated voltage +10% range, read the instrument indications of 220V, 198V, 242V respectively, and after the indications are stable, record the indications A, A, etc. Each voltage value is tested 3 times, and the arithmetic average is calculated according to ():
A = LA -Aa!
武中：4
Change the value of the instrument when the voltage is increased;
1.,—Determine the value of the instrument when the voltage is increased:
·S full scale value
5 Verification result processing and verification cycle
5.1 Check this regulation 2.2.1-2.2.5 Verification will issue a verification certificate to the unqualified device, and a verification notice to the unqualified device, 2.2.6 Voltage wave 5.2 The calibration period is 1 year. It is recommended to perform calibration when the battery is replaced or the test results are checked. Appendix A Instrument Name Manufacturer Environmental Requirements Appearance Working Conditions Check Residual Current Compensation Response Time Minimum Response Time 945—1999
Verification record format
Factory number
Instrument value
Standard gas density
Delivery unit
Primary battery type
Standard gas, bottle number
Average value
Basic error
Stability
Reading time
Flow rate rs./min
JJG945—1999
Standard value
Instrument indication
Maximum value||t t||Instrument indication
Minimum value
Test range full value
Standard gas sensitivity
AG reproducibility
Flow rate ml/min
Power supply voltage fluctuation effect
Continuous voltage
Indication error
Stabilization time
JJG945—1999
Instrument indication
Equipoint measurement
Tester:
Verifier:
Standard gas temperature
Test period:
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.