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JJG 205-2005: Verification Regulation of Mechanical Thermo-hygrometers
Status: Valid JJG 205: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 205-2005 | English | 389 |
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Verification Regulation of Mechanical Thermo-hygrometers
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JJG 205-2005
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| JJG 205-1980 | English | 319 |
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Verification Regulation of Meteorological Hair Hygrometer and Hair Hygrograph
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JJG 205-1980
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PDF similar to JJG 205-2005
Basic data | Standard ID | JJG 205-2005 (JJG205-2005) | | Description (Translated English) | Verification Regulation of Mechanical Thermo-hygrometers | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A61 | | Classification of International Standard | 17 | | Word Count Estimation | 15,187 | | Date of Issue | 2005-09-05 | | Date of Implementation | 2006-03-05 | | Older Standard (superseded by this standard) | JJG 205-1980 | | Quoted Standard | JJG 2046; JIS B7920; JB/T 6862 | | Regulation (derived from) | State Administration of Quality Supervision, Inspection and Quarantine Notice No. 135 | | Summary | This standard applies to measurement range of 5 �� ~ 50 ��, 30% RH ~ 95% RH mechanical hygrometer. This standard applies to mechanical hygrometer (hereinafter referred hygrometer hygrometer) the initial verification, testing and use of follow-up inspection. | JJG 205-2005: Verification Regulation of Mechanical Thermo-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 Mechanical Thermo-hygrometers
National Metrology Verification Regulations of the People's Republic
Mechanical thermometer and hygrometer
Released on.2005-09-05
2006-03-05 implementation
The General Administration of Quality Supervision, Inspection and Quarantine issued
Replace JJG 205-1980
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
Drafting unit. Shanghai Institute of Metrology and Testing Technology
This procedure entrusts the National Physical and Chemical Metrology Technical Committee to explain
The main drafters of this procedure.
Zhang Wendong (Shanghai Institute of Metrology and Testing Technology)
Participate in the drafters.
Wang Guoyan (Shanghai Institute of Metrology and Testing Technology)
Zhang Lifang (Shanghai Institute of Metrology and Testing Technology)
table of Contents
1 Scope (1)
2 Citations (1)
3 terms (1)
3.1 Mechanical Hygrometer (1)
3.2 Dry and wet watch (1)
3.3 Mechanical Thermometer (1)
4 Overview (1)
5 Metrological performance requirements (2)
5.1 Temperature indication error (2)
5.2 Relative humidity indication error (2)
5.3 Temperature hysteresis/wet hysteresis error (2)
5.4 Repeatability (2)
6 General technical requirements (2)
6.1 Appearance (2)
6.2 Other requirements for pointer thermometers and hygrometers (2)
6.3 Other requirements for recording thermometers and hygrometers (2)
7 Measuring instrument control (3)
7.1 Verification conditions (3)
7.2 Verification project (4)
7.3 Verification method (4)
7.4 Processing of verification results (5)
7.5 Verification cycle (5)
Appendix A Verification Record Format (6)
Appendix B Verification certificate page format (7)
Appendix C Format of the verification result page (8)
Appendix D Temperature and Humidity Uniformity and Volatility Test Method for Temperature and Humidity Test Box (9)
Mechanical thermometer and hygrometer verification procedures
1 Scope
This procedure is applicable to mechanical thermometers and hygrometers with a measuring range of 5 ° C ~ 50 ° C, 30% RH ~ 95% RH.
The first verification, subsequent verification and in-use inspection of the mechanical hygrometer (hereinafter referred to as the hygrometer, hygrometer).
2 Citations
"Humidity Measurement", Meteorological Press, 1st edition,.1990
JJG 2046-1990 "Humidity measuring instrument measurement and verification system"
JISB7920.2000 "Hygrometer - Test Method"
JB/T 6862-1993 "Hygrometer"
Use of this procedure should take care to use the current valid version of the above cited documents.
3 terms
3.1 Mechanical hygrometer
Using hair, nylon and organic polymer coating materials as moisture sensing components, direct indication of relative humidity
Type and record type hygrometer. It includes a hair hygrometer, a hair moisture recorder, and the like.
3.2 dry and wet table
Naturally ventilated by a glass liquid thermometer, wet water jacket, water container and humidity checklist or slide rule
Dry and wet bulb hygrometer.
3.3 mechanical thermometer and hygrometer
By humidity part (mechanical hygrometer or wet and dry meter) and temperature part (bimetal thermometer or glass liquid temperature
An integrated temperature and humidity instrument.
4 Overview
The geometrical dimensions of organic polymer materials such as hair, nylon and polyimide will vary with relative humidity.
Change. Mechanical thermometers use this feature to make these materials into linear, ribbon-like wetted components or coatings.
Coiled into a hairspring-like moisture-sensitive element on an elastic material, and then the geometric amount caused by the humidity change by a mechanical amplifying device
The change is indicated by a pointer or recorded with a stylus to directly indicate the relative humidity.
Under certain conditions, the relative humidity of the air is a function of the dry bulb temperature and the wet bulb temperature, ie wet.
The lower the degree, the lower the temperature of the wet bulb, and the greater the difference between the wet and dry temperature. The wet and dry watch is made by using this principle.
The mechanical thermometer and hygrometer is an integrated temperature and humidity instrument composed of a temperature part and a humidity part, and the temperature part
It is a bimetal thermometer or a glass liquid thermometer, and the humidity part is a mechanical hygrometer or a wet and dry watch. It is suitable for experiments
Measurement of indoor environmental temperature and humidity in rooms, computer rooms, warehouses, and workshops.
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