JJG 942-2010 English PDF

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JJG 942-2010: Verification regulation of ball pneumatic dead weight testers
Status: Valid

JJG 942: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 942-2010	419	Add to Cart	3 days	Verification regulation of ball pneumatic dead weight testers	Valid
JJG 942-1998	559	Add to Cart	4 days	Verification Regulation of Ball Pneumatic Dead Weight Tester	Obsolete

Similar standards

JJG 882   GB/T 36126   GB/T 1885   JJG 126   JJG 948   JJG 944   

Basic data

Standard ID: JJG 942-2010 (JJG942-2010)
Description (Translated English): Verification regulation of ball pneumatic dead weight testers
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Classification of International Standard: 17.100
Word Count Estimation: 18,153
Date of Issue: 2010-05-11
Date of Implementation: 2010-11-11
Older Standard (superseded by this standard): JJG 942-1998
Quoted Standard: JJG 99-2006
Regulation (derived from): AQSIQ Announcement No. 50 of 2010
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to measuring range limit 2kPa ~ 10MPa float gauge the initial verification, testing and use of follow-up inspection.

JJG 942-2010: Verification regulation of ball pneumatic dead weight testers

---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 ball pneumatic dead weight testers State verification procedures People's Republic of China Float manometer Issued on. 2010-05-11 2010-11-11 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Float gauge test procedures DeadWeig htTesters Replacing JJG 942-1998 The regulations by the State Administration of Quality Supervision, Inspection and Quarantine approved on May 11, 2010, and from From November 11, 2010 into effect. Focal point. the National Technical Committee of pressure measurement Drafting. Shanghai Institute of Measurement and Testing Shandong Province Institute of Metrology Jiangsu Province Institute of Metrology The measurement procedure commissioned the National Technical Committee is responsible for interpreting pressure The drafters of the regulations. Huan Lun (Shanghai Institute of Measurement and Testing) Ma Kun (Shandong Province Institute of Metrology) Tu Li Meng (Shanghai Institute of Measurement and Testing) Zhang Qiang (Jiangsu Province Institute of Metrology)

table of Contents

1 Scope (1) 2. Referenced Documents (1) 3 Overview (1) 4 metering performance requirements (2) 4.1 accuracy class (2) Float 4.2 Effective area (2) 4.3 special weight, weight rack (including float) quality (3) 4.4 verticality (3) 4.5 discrimination (3) 4.6 air change impacts (3) 4.7 Float period effective area rate of change (4) 5 General technical requirements (4) 5.1 Appearance (4) 5.2 special weight and weight holder (4) 5.3 Stability of work float (4) 6 Control of measuring instruments (4) 6.1 Verification Project (4) 6.2 test conditions (5) 6.3 Verification Methods (6) 6.4 Verification Results Processing (8) 6.5 test cycle (8) Appendix A pressure - flow relationship measurement method (9) Appendix B China's major urban air buoyancy correction coefficient (β) reference value (10) Appendix C Chinese major cities gravitational acceleration reference value (12) Appendix D Float Pressure Gauge recording format (14) Appendix E float gauge calibration certificate, test results form of notice (16) Appendix F float gauge Instructions (18) Float gauge test procedures

1 Scope

The order applies to the upper limit of the measurement range 2kPa ~ 10MPa float manometer initial verification, follow-up inspection Test set and use.

2 Citations

The regulations cited in the following documents. JJG 99-2006 weight test procedures When using this procedure, it should pay attention to using the currently valid version of the documents cited.

3 Overview

Tester is mainly composed of the float, nozzle, weight racks, special weight, flow regulators, gas filters and Base and other components. Float gauge is the use of a precision ball into cylindrical or conical nozzle mouth, weight racks and special Fa Yard acting on the top of the sphere, the gas flow through the regulator and sprayed into the sphere filters, pressure within the nozzle in the ball The lower part of the body so that the ball float within the nozzle. When the gas forces acting on the float and float, weights and special weights heavy frame The force equilibrium, tester is able to output a stable and accurate pressure. Tester is adjusted according to traffic flow is divided into manual adjustment and flow tester is adjusted automatically float Manometer two kinds. Figure 1, Figure 2. Figure 1 Flow tester is manually adjustable structure diagram 1- gas source; 2- gas source switch; 3- meter regulator valve; 4- meter; 5- Air bubble; 6- special weight; 7- weight frame; 8- float; 9- nozzle; 10- pressure stabilizer; 11- output switch; 12- output; 13- filter; 14- flow stabilizer; 15- base; 16- leveling feet ......

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