Verification Regulation of Electrochemical Electrode Gas Oxygen Analyser
Some standard content:
The People's Republic of China National Metrology Verification Regulation JJG365—1998
Electrochemical Electrodr
Gas Oxygen Analyser
1998-11-02 Issued
1999-05-01 Implementation
National Quality Supervision Bureau Issued
JJG3651998
Electrochemical Electrode Gas Oxygen Analyser
Verification Regulation of Electrnchemical Electrode Gas Oxygen AnalyserJJG 365--1998
Replaces JIG365-1984
This verification procedure was approved by the National Quality and Technical Supervisory Committee on November 0, 1998, and will be implemented on May 01, 1999
Responsible unit:
National Technical Committee on Chemical Certification
Original unit: National Standard Material Research Center
Ningbo Technical Supervision Bureau
Technical provisions of this procedure The drafting unit is responsible for interpreting the main drafters of this regulation: Li Chunying, Guan Qiahe, Gong Linzhen, Yu Dengfu, JJC365-1998 (National Research Center for Standard Materials) (Ningxia Technical Supervision Bureau) (National Research Center for Standard Materials) (National Research Center for Standard Materials) (National Research Center for Standard Materials)
Technical requirements
Verification conditions
Testing methods
Processing of test results
Appendix 2
JJG365—18
Format of verification certificate,
Notification of test results (back)
Verification records
JIG365—1998
Verification procedures for electrochemical electrode gas oxygen analyzers This procedure is applicable to new film-making, During use and after repair, the electrochemical electrode gas oxygen analyzer (hereinafter referred to as the instrument) should be measured. The measurement should be expressed in fractions, and the range should not be less than 1%: Overview
Electrochemical gas oxygen analyzer is used in the chemical industry, metallurgy, electronics industry, environmental monitoring, medical and health, and aerospace industries. The instrument consists of an electrochemical electrode [liquid electrolyte] gas oxygen sensor and an electronic display unit with temperature compensation. According to the gas introduction form, it is divided into two types: absorption type and diffusion type. The measurement sequence is shown in Figure 1.
! Technical requirements for electrochemical electrode gas oxygen analyzer
1 Appearance and working performance inspection
1.1 The instrument should be accompanied by a technical manual of the manufacturer, and the attached documents should be complete; the instrument name, receiver model, terminal number, manufacturer name, and manufacturing license mark should be marked; each switch, button, and display should have a clear function mark.
2 After power on and ventilation, all parts can work normally and all regulators can regulate normally. The display should show the measurement value continuously and stably.
2 Verification items and definitions
2.1 Residual current
The indicator point shift caused by the residual current of the electrode. 2.2 Response time
The time required for the instrument to indicate more than 90% of the oxygen content in the measured gas: 2.3 Indication error
The difference between the indication value and the standard value of the instrument under the specified verification conditions. 2.4 Stability
2.4.1 Zero drift
Under the specified calibration conditions, the instrument is continuously operated for 1 hour with standard gas, and the percentage of zero point change to the full scale value
2.4.2 Indication value
H:365—1998
Under the specified calibration conditions, the instrument is continuously operated for 1 hour with standard gas, and the error caused by indication drift.
2.5 Reproducibility
Under the same conditions, the same micro gas is tested for multiple times to measure the indication error. 2.6 Alarm error
Under the specified calibration conditions, the difference between the alarm setting value of the instrument and the actual alarm value. 3 Technical indicators
E: The technical indicators are shown in Table 1.
Table 1 Main technical indicators of electrochemical electrode gas oxygen analyzer Calibration
Response time
Electrochemical
Absorption type
4 Environmental requirements
Indication error
[0-100%) 0
Diffusion type (0-75%) 0 2
4.1 Ambient temperature: 15-.30°C;
4.2 Relative humidity: 45%--85%:
Three calibration conditions
4.3 Atmospheric pressure: 6-106°C:
4.4 No electromagnetic interference that affects the work of the instrument: Stability
Zero point position, repeatability
4.5 The environment and airflow are good, and the optical sensor detection accuracy is improved. 5 Verification requirements 5.1: The instrument to be tested and the calibration gas should be placed in the calibration environment for 4 hours to work <1%
boundary setting value
5.2 During the calibration, the calibration gas flow shall be in accordance with the instructions. If there is no special requirement, it shall be 3)m1./mi, but the flow fluctuation shall be less than =20mL/mins
6 Requirements for calibration gases and equipment
6.1 Calibration gas
6.1.1 Standard gas
Use nitrogen hydrogen standard gas, and its preparation uncertainty should be less than 1% (including density more than 3) 6.1.2 Zero point gas
The residual oxygen content of the gas should be lower than that of the instrument to be tested 0.01% of the minimum full scale value of the receiver (reference gas purity is 3
99.99% high purity gas>).
6.1.3 Dry air with a water content of 1%.
G.2 Testing equipment
JJC365—1998
6.2.1 Gas pressure gauge, pressure gauge, gas pressure gauge used in conjunction with the test gas cylinder 6.2.2 Gas flowmeter
Determination accuracy: <1%;
Measurement range: .-500mlmi:e
6.2.3 Stopwatch
Division value: 0.015
6.2.4 Gas pipeline: gold-bottomed plastic material. 6.2.5 Diffusion test kit for the micro-carrier: IV Test method
External Observation and work stop routine inspection
Carry out according to the requirements of 1.1 and 1.2.
&Residual current calibration
8.1 Adjust the potential zero point of the instrument,
8.2 Connect the voltage to the calibration gas circuit (see Figure 2). N
Figure 2 Schematic diagram of calibration gas circuit
~Analyzer: 2—or electrode:—Two gas phases:——Compensation 6,7—Part 1: 8,9—Out; 10—A pair of oxygen standard companions; 11—Pregnant point gas 8,3 If it is the most central block, pass the required point gas through the analyzer, read the instrument indication after 5m, and then repeat the measurement to achieve the average value. And calculate the equal point drift caused by the residual current according to the formula (): A
Where: A,-
—The average value of the instrument indication:
JJG 3651996
eight minimum selected by the customer
9 time set
reverse the set gas point, compare the British gas valve, set the oxygen content in the standard elimination instrument, use a stopwatch to measure from the exchange rate to the instrument group indicated by the old sensitive gas measurement rate Qiu Ming capital to use, the total limit 3 times: take the arithmetic mean 0 indication error British ten points
10, 1 pick the fixed points and sequence
. [The normal calibration points of the instrument shall not be less than 3 points (one selects 15%, 11%, 85 near the specified value 3 points), the range shall not be less than 2 points (one selects 2 points near the specified value: 10.1.2 The indication of the instrument shall be calibrated in sequence from the low oxygen point to the high oxygen point. 0.2 1 Verify the value of the instrument
10.2.1 Calibrate the instrument in the specified format, and use the gas to calibrate the zero point and the stroke of the instrument: 10.2.2 The oxygen standard gas with known content is used as the trajectory, etc. After the indication value is selected, the time from the gas to the reading is generally increased by 3 questions (when the instrument responds when the flash is produced), 10.2.3 Replace the hydrogen standard gas with different concentration, calibrate point by point according to 102.2, and repeat the calibration for 3 times at each point, take the arithmetic average, and calculate the indication error according to formula (2), ZA
Where: A is the average value of the instrument indication bzxz.net
A. The heat content of the standard gas is:
A,—The value of the difference between the tested value and the value of the stability is
-A×10%
11.1 During the inspection of this article, the range of environmental changes (minimum and minimum) should be as follows: change A, change 10P, display change 0
11.2 During the inspection process, no adjustment is required: 11.3 When the process is at the minimum level, the gas is set, and the display is set to the S position of the process. Check and read: record once every 0 min, and continue to check! 11.4 After the inspection, set the process to 25, set the oxygen in the air, and wait for the value to be released. Record 1 year, and continue to check for 1h.
11.5 The following formula is used to calculate the zero drift and indication drift of the instrument: A sr - Aai x 100%
where Aax
is the value of the instrument:
the minimum reading;
the clarity value of the process to be tested,
the value of the instrument value during calibration.
JJG365—1998
The instrument value should be kept constant for 3 minutes after the instrument is fully charged. 12.2 The instrument should be fully charged for 3 minutes after the instrument is fully charged. The instrument value should be kept constant for 3 minutes after the instrument is fully charged. -A)S
Wherein: A
Instrument indication:
Measurement point average value:
Measurement time:
13According to the inspection of alarm error
Set the alarm point, select the alarm setting point value 1.5The standard gas should be passed into the analyzer, and the difference between the instrument indication and the set value should be observed: re-inspect for a certain number of times, and the calculated average value should be obtained. 5. Processing of inspection results
14 According to the inspection results, the qualified instrument will be issued with a calibration certificate: the unqualified instrument will be issued with a calibration result notice, and it will be noted that the unqualified instrument has not been inspected for a certain number of times
15 The standard period is 1 year:
Appendix Record 1
J3365—1998
Verification certificate, verification result notice (back) Format 1: Appearance and normal working inspection:
2. Remaining battery:
3. Response time:
4. Indication error:
Zero point source shift:
Indication drift:
6. Repeatability:
7. Alternative error:
Conclusion:
Appendix 2
Device name
Manufacturer
Electrical type
Verification environment temperature
1. Appearance, and. 1. Working normality 2. Residual current test
JJC365—1998
Test record
Certificate number
, product number
, mixing
, instrument indication value A
3, response time determination
4. Indication error test
Standard value
Response time
Indication value 4,
, inspection unit
, equipment code
, minimum error
average value
average A
Residual output
F·average load||tt ||Indication error
Standard value
5.Stability verification
[1]Zero drift verification
Indication value verification
6.Reproducibility verification
Instrument indication
Instrument indication A,
Instrument indication A
JJG365
Instrument missing indication 1,
Almost average A,
Change value
Amr-Amm
Change value
Average value
Indication error
Zero source
Indication source drift
Reproducibility error
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