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JJG 257-2007: Verification Regulation of Float Meter
Status: Valid JJG 257: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJG 257-2007 | English | 649 |
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5 days [Need to translate]
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Verification Regulation of Float Meter
| Valid |
JJG 257-2007
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| JJG 257-1994 | English | 359 |
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3 days [Need to translate]
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Verification Regulation of Rotameter
| Obsolete |
JJG 257-1994
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| JJG 257-1981 | English | RFQ |
ASK
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3 days [Need to translate]
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(Chinese Industry Standard)
| Obsolete |
JJG 257-1981
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PDF similar to JJG 257-2007
Basic data | Standard ID | JJG 257-2007 (JJG257-2007) | | Description (Translated English) | Verification Regulation of Float Meter | | Sector / Industry | Metrology & Measurement Industry Standard | | Classification of Chinese Standard | A53 | | Classification of International Standard | 17.120 | | Word Count Estimation | 25,241 | | Date of Issue | 2007-08-21 | | Date of Implementation | 2008-02-21 | | Older Standard (superseded by this standard) | JJG 257-1994 | | Quoted Standard | AQSIQ Announcement No. 142 of 2007 | | Regulation (derived from) | AQSIQ Announcement No. 142 of 2007 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine | | Summary | This standard applies to rotameter type evaluation, initial verification, testing and use of follow-up inspection. | JJG 257-2007: Verification Regulation of Float Meter---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 Float Meter
State verification procedures People's Republic of China
Rotameter
FloatMeter
Posted 2007-08-21
2008-02-21 implementation
The State Administration of Quality Supervision, Inspection and Quarantine released
Rotameter test procedures
ofFloatMeter
Replacing JJG 257-1994
The regulations by the State Administration of Quality Supervision, Inspection and Quarantine August 21, 2007 for approval and self
From February 21, 2008 into effect.
Focal point. the National Technical Committee on Metering flow capacity
The main drafting units. China Institute of Metrology
Participated in the drafting. Zhejiang Institute of Quality and Technical Supervision and Inspection
Grand National Water flow metering station
Traffic Instrument Co., Ltd. Yuyao, Zhejiang Yinhuan
Yuyao Kim Tae Instrument Co., Ltd.
Shenyang North Star Flow Meter Factory
Kaifeng Instrument Co., Ltd.
Henan Institute of Metrology
This procedure flow capacity commissioned the National Technical Committee responsible for the interpretation of measurement
The main drafters of this procedure.
Xu Yinghua (China Institute of Metrology)
Drafters participate.
Shen Wenxin (Zhejiang Quality and Technical Supervision and Inspection Institute)
Miao Yu-sheng (Grand National Water flow metering station)
Zhu Jiashun (Yuyao, Zhejiang Yinhuan Traffic Instrument Co., Ltd.)
Water Cui Li (China Institute of Metrology)
Zhang Lifeng (Yuyao Kim Tae Instrument Co., Ltd.)
Chen Ping (Shenyang North Star Flow Meter Factory)
Lee anthology (Kaifeng Instrument Co., Ltd.)
Kong Qingyan (Henan Institute of Metrology)
table of Contents
1 Scope (1)
2. Referenced Documents (1)
3 Terms and Definitions (1)
4 Overview (2)
4.1 Structure type (2)
4.2 works (3)
5 metering performance requirements (3)
5.1 accuracy class and the maximum permissible error (3)
5.2 Indication Error (4)
5.3 hysteresis (4)
6 General Requirements (4)
6.1 nameplate and logo (4)
6.2 random file (4)
6.3 Appearance (4)
6.4 Flow Measurement Limit the number of lines (5)
Flow range of 6.5 meter (5)
6.6 Performance requirements for explosion-proof (5)
7 control of measuring instruments (5)
7.1 test conditions (6)
7.2 Verification Project (6)
7.3 Verification Methods (7)
7.4 Arbitration (11)
7.5 Verification Results processing (11)
7.6 test cycle (11)
Appendix A pattern evaluation (12)
Appendix Table B common gas density under standard conditions (19)
Appendix C calibration certificate and test results of notice (in-page) format (20)
Rotameter test procedures
1 Scope
The order applies to rotameter (hereinafter referred to as meter) of pattern evaluation, initial verification, subsequent verification and make
With the test.
2 Citations
The provisions of the following standards, procedures included by reference, constitute a point of order provisions.
JB/T 6844-1993 metal tube
JB/T 9255-1999 Glass Rotameter
When using this procedure, it should pay attention to using the currently valid version of the documents cited.
3 Terms and Definitions
3.1 Flow Limit maximumflow-rate
The flow meter can measure the highest value.
3.2 Flow Limit minimumflow-rate
The flow meter can measure the minimum value.
3.3 positive stroke test positive-strokecalibration
For checking the flow meter from the lower to the upper limit of the flow meter point by point, and grew up in test point flow rate adjustment
To the test point, called a positive stroke test.
3.4 Anti-stroke test negative-strokecalibration
From the upper flow meter to limit the flow meter for checking point by point, and from the test point is greater than the flow rate adjustment
To the test point, known as anti-stroke check.
3.5 indicates flow indexflow-rate
Indicating traffic flow float flowmeter is working diameter at the position indicated by the pointer or indicator.
Traffic referenceconditionflow-rate 3.6 standard state
Fluid temperature is 20 ℃, absolute pressure 101325Pa state called the standard state flow in this state
It is defined as the flow rate under standard conditions.
3.7 scale flow scaleflow-rate
A tick mark scale flow meter represented, that is, in a transparent conical tube flowmeter or scale plate
(A combination of tick marks and numbers). Scale flow meter usually flow, percentages or mm height mark in the form of
Transparent tube or cone scale plate, and indicate the name of the media in its scale meter evident at the site, temperature, pressure (density
Degrees) and units of measurement.
3.8 reference error fiducialerror
Absolute error value and limits the flow ratio, expressed as a percentage.
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