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JJG 500: Historical versions
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| JJG 500-2005 | English | 319 |
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Verification Regulation of Electrolytic Hygrometers
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| JJG 500-1987 | English | 279 |
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Verification Regulation of Analytical Instrument of Trace Water by Electrolytic Method
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Basic data
| Standard ID | JJG 500-2005 (JJG500-2005) |
| Description (Translated English) | Verification Regulation of Electrolytic Hygrometers |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A61 |
| Classification of International Standard | 17 |
| Word Count Estimation | 12,153 |
| Date of Issue | 2005-09-05 |
| Date of Implementation | 2006-03-05 |
| Older Standard (superseded by this standard) | JJG 500-1987 |
| Quoted Standard | State Administration of Quality Supervision, Inspection and Quarantine Notice No. 135 |
| Regulation (derived from) | State Administration of Quality Supervision, Inspection and Quarantine Notice No. 135 |
| Summary | This standard applies to electrolytic hygrometer initial verification, testing and use of follow-up inspection. Electrolytic hygrometer shape identification or prototype tests for measuring the performance test may be carried out with reference to the rules. |
Similar standards
JJG 631| JJG 635|JJG 551|JJG 500-2005: Verification Regulation of Electrolytic Hygrometers
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Verification Regulation of Electrolytic Hygrometers
National Metrology Verification Regulations of the People's Republic
Electrolytic humidity meter
Released on.2005-09-05
2006-03-05 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
Replace JJG 500-1987
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine on September 5,.2005, and
It will take effect on March 5,.2006.
Focal Point. National Physical and Chemical Metrology Technical Committee
Main drafting unit. National Standards Research Center
Participated in the drafting unit. Chengdu Instrument Factory
This procedure entrusts the National Physical and Chemical Metrology Technical Committee to explain
The main drafters of this procedure.
Li Zhanyuan (National Center for Standard Materials Research)
Participate in the drafters.
Lin Weiguo (Chengdu Instrument Factory)
Yi Hong (National Standards Research Center)
Ren Changqing (National Reference Materials Research Center)
table of Contents
1 Scope (1)
2 Overview (1)
3 Metrological performance requirements (2)
4 General technical requirements (2)
4.1 Appearance of the instrument (2)
4.2 Instrument Circuit System (2)
4.3 pneumatic system (2)
4.4 Instrument background value (2)
4.5 Measurement range (2)
5 measuring instrument control (2)
5.1 Verification conditions (2)
5.2 Verification items and verification methods (3)
5.3 Processing of verification results (4)
5.4 Verification cycle (4)
Appendix A Electrolytic Hygrometer Calibration Record Format (5)
Appendix B Format of Electrolytic Hygrometer Calibration Certificate and Verification Result Notice (6)
Electrolytic humidity meter verification procedure
1 Scope
This procedure is applicable to the first verification, subsequent verification and in-use inspection of the electrolysis hygrometer. Electrolytic humidity meter
For the measurement performance test in type identification or prototype test, refer to this procedure.
2 Overview
Electrolytic humidity meter is widely used in petrochemical, electronic, electric power, metallurgical and other industrial sectors for gas humidity detection.
Includes intermittent measurements and online measurements.
The instrument uses an electrolytic method to measure the humidity in a gas, and the range generally refers to less than 1000 μL/L. The working principle is.
The gas to be measured flows through a special structure of the electrolytic cell, and the water vapor is absorbed by the P2O5 film on the surface of the electrode and is electrolyzed.
For hydrogen and oxygen, P2O5 is regenerated at the end of the reaction. The reaction process can be expressed as.
P2O5 H2O=2HPO3 (1)
2HPO3=H2↑
2O2↑ P2O5
(2)
Merger (1), (2)
H2O=H2↑
2O2↑
(3)
In the above reaction, the amount of water to be electrolyzed is proportional to the amount of electricity passing through the electrolytic cell. The measured gas continuously passes through the electrolysis
The pool in which the water vapor is completely absorbed by the P2O5 film on the surface of the electrode is electrolyzed. When the absorption and electrolysis process is reached
At equilibrium, the electrolysis current is proportional to the humidity of the gas. This is the quantitative basis for the instrument.
If the ambient temperature, pressure and measured gas flow rate are known, according to Faraday's law of electrolysis and gas state equations
The relationship between the derived electrolysis current and the moisture content of the gas to be measured is.
I=
QpT0FVr10-4
3p0TV0
(μA) (4)
It can also be simplified as. I=1.4358×10-1VrQ
pT0
p0TV0
(μA) (5)
In the formula.
I --- electrolysis current of water, μA;
Vr --- the water vapor content of the gas to be tested, μL/L;
Q --- measured gas flow, mL/min;
p --- atmospheric pressure, Pa;
P0 --- standard atmospheric pressure, 101325Pa;
T --- ambient temperature, K;
T0 --- critical absolute temperature, 273.15, K;
F --- Faraday constant, 96484.56C/mol;
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