JJG 274-2007 English PDFJJG 274: Historical versions
Basic dataStandard 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17.100 Word Count Estimation: 15,149 Date of Issue: 2007-06-14 Date of Implementation: 2007-12-14 Older Standard (superseded by this standard): JJG 274-1981 Quoted Standard: AQSIQ Announcement No. 95 of 2007 Regulation (derived from): AQSIQ Announcement No. 95 of 2007 Issuing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 Contents1 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 procedures1 ScopeThe order applies to dual-tube mercury manometer initial verification, subsequent verification and in-service inspection.2 OverviewDouble 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 requirements3.1 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 requirements4.1 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. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJG 274-2007_English be delivered?Answer: Upon your order, we will start to translate JJG 274-2007_English as soon as possible, and keep you informed of the progress. 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