JJG 274: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 274-2007 | English | 599 |
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Verification Regulation of Double Tube Mercury Barometer
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JJG 274-2007
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| JJG 274-1981 | English | 319 |
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Verification Regulation of Double Tube Mercury Barometer
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JJG 274-1981
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PDF similar to JJG 274-2007
Basic data | Standard ID | JJG 274-2007 (JJG274-2007) | | Description (Translated English) | Verification Regulation of Double Tube Mercury Barometer | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A53 | | Classification of International Standard | 17.100 | | Word Count Estimation | 15,149 | | Date of Issue | 2007-06-14 | | Date of Implementation | 2007-12-14 | | Older Standard (superseded by this standard) | JJG 274-1981 | | Quoted Standard | AQSIQ Announcement No. 95 of 2007 | | Regulation (derived from) | AQSIQ Announcement No. 95 of 2007 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to dual-tube mercury manometer initial verification, testing and use of follow-up inspection. | JJG 274-2007: Verification Regulation of Double Tube Mercury Barometer---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 Double Tube Mercury Barometer
State verification procedures People's Republic of China
Double tube mercury manometer
Posted 2007-06-14
2007-12-14 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Double tube mercury manometer
Verification Regulation
Barometer
Replacing JJG 274-1981
The regulations by the State Administration of Quality Supervision, Inspection and Quarantine, 2007 June 14 ratification and
From December 14, 2007 implementation.
Focal point. the National Technical Committee of pressure measurement
Main drafting unit. Shanghai meteorological instruments detected measurement center
Participated in the drafting. Changchun Meteorological Instrument Factory
The measurement procedure commissioned the National Technical Committee is responsible for interpreting pressure
The main drafters of this procedure.
SOUTH - (Shanghai meteorological measurement equipment testing center)
Drafters participate.
Chen Huan (Shanghai meteorological measurement equipment testing center)
Wei Min (Shanghai meteorological measurement equipment testing center)
Puming Jun (Changchun Meteorological Instrument Factory)
Zhang Sheng (Changchun Meteorological Instrument Factory)
table of Contents
1 Scope (1)
2 Overview (1)
3 metering performance requirements (1)
3.1 pairs value correction value requirements (1)
3.2 Indication as amended, the maximum permissible error (1)
4 General Requirements (1)
4.1 Appearance (1)
4.2 Other requirements (2)
5 control of measuring instruments (2)
5.1 verification Conditions (2)
5.2 Verification Project (2)
5.3 Verification Methods (3)
5.4 Verification Results Processing (5)
5.5 test cycle (5)
A cup of mercury in the calculation of the amount of mercury appendix (6)
Appendix B twin-tube mercury pressure test records represents value comparison table format (7)
Appendix C test and data processing related Notes (8)
Appendix D test certificate-page format (9)
Appendix E test results in the notice page format (10)
Mercury gauge double-barreled test procedures
1 Scope
The order applies to dual-tube mercury manometer initial verification, subsequent verification and in-service inspection.
2 Overview
Double tube mercury manometer (hereinafter referred to as double tube sheet) is a measure of the pressure meter for measuring the pressure within the pressure device
Force, atmospheric pressure can also be measured. Double tube sheet is the use of vacuum tube has a good degree of vacuum and pressure gravity of mercury
The principle of gravity and the inner tube of the mercury column outside pressure (pressure within the device pressure or atmospheric pressure) and the measured equilibrium
pressurized.
Double tube sheet structure for siphon trough. It consists of two inner glass tube (which referred to a vacuum, another said pressure
Power tube) and the outer tube, the mercury trough, the mercury cups, ring zero index, the main scale, vernier adjustment mechanism and its peer group
to make. The measurement range is generally 0hPa ~ 1070hPa, the normal operating temperature of -15 ℃ ~ 45 ℃.
3 metering performance requirements
3.1 pairs value correction value requirements
Double pipe table showing values corrected values are shown comparative test results should not exceed ± 0.40hPa.
3.2 Indication amended the maximum permissible error
Double tube sheet through initial verification or subsequent verification or use after passing inspection, during use, showing the value, as amended,
450hPa ~ 1070hPa within the range of the maximum permissible error of ± 0.30hPa, the maximum allowed in the range of less than 450hPa
Xu error of ± 0.50hPa.
4 General technical requirements
4.1 Appearance
4.1.1 two pipe should be upright, smooth, up and down the same thickness, cracks and other defects should not affect the strength. In test
Not have silk air bubbles, stones, scratches, and other ripple affect the readings of the defect within the volume segment.
4.1.2 The two outer casing should be upright, smooth, uniform thickness, no bump, lacerations and other defects. Slots should be parallel to the front and rear,
Neat, uniform width; two slots and the jacket pipe centerline axis should be in the same plane.
Outer sleeve slot edge perpendicular to the main scale and vernier 4.1.3 engraved lines should pressure pipes, when any engraved vernier
When any line and the main scale reticle alignment, two engraved lines should be connected in a straight line; all the engraved line and the corresponding figures should be inscribed clear
Clarity, uniformity, coloring firmly.
4.1.4 vernier care before and after the reference edge should be smooth, and engraved with the vernier zero line at the same level, and with the pressure
Outer casing tube axis perpendicular to the force.
4.1.5 the parts in contact with mercury should be linked closely together, there should be no leakage of mercury.
4.1.6 Mercury hose communicating with the groove bottom of the cup of mercury should be soft.
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