JJG 882-2019 PDF English
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| JJG 882-2019 | English | 450 |
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Pressure transmitters
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| JJG 882-2004 | English | 150 |
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Verification Regulation of the Pressure Transmitter
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| JJG 882-1994 | English | 919 |
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Verification Regulation of Pressure Transmitters
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JJG 882-2019: Pressure transmitters---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JJG882-2019
JJG
METERING CALIBRATION SPECIFICATION
Pressure transmitters
Issued on. DECEMBER 31, 2019
Implemented on. MARCH 31, 2020
Issued by. State Administration for Market Regulation
Verification regulation of pressure transmitters
Replacing JJG 882-2004
Jurisdiction organization. National Technical Committee for Pressure
Metrology
Main drafting organization.
Shanghai Institute of Metrology and Testing Technology
Participated drafting organizations.
Shanghai Haoge Measurement Technology Group Co., Ltd.
For this specification, the National Technical Committee for Pressure Metrology
is entrusted to be responsible for interpretation.
Main drafters of this specification.
Tu Limeng (Shanghai Institute of Metrology and Testing Technology)
Hu Anlun
Wang Can (Shanghai Institute of Metrology and Testing Technology)
Participating drafters.
Wu Hao (Shanghai Haoge Measurement Technology Group Co., Ltd.)
Table of Contents
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and units of measurement... 6
4 Overview... 7
5 Measurement performance requirements... 7
5.1 Indication error... 7
5.2 Hysteresis... 8
5.3 Effect of static pressure of differential pressure transmitter... 8
6 General technical requirements... 9
6.1 Appearance... 9
6.2 Tightness... 9
6.3 Insulation resistance... 9
6.4 Insulation strength... 9
7 Measuring instrument control... 10
7.1 Verification conditions... 10
7.2 Verification items... 12
7.3 Verification method... 12
7.4 Processing of verification results... 17
7.5 Verification cycle... 17
Appendix A Device connection mode during pressure transmitter verification18
Appendix B Verification record format of pressure transmitter... 20
Appendix C Inner page format of verification certificate and verification result
notice... 22
Appendix D Example of uncertainty evaluation of current output measurement
results of grade 0.1 pressure transmitter... 23
Appendix E Determination of the extended uncertainty U of the standard unit
... 30
1 Scope
This regulation applies to the initial verification, subsequent verification, in-use
inspection of pressure (including positive pressure, negative pressure,
differential pressure, absolute pressure) transmitters.
2 Normative references
This regulation refers to the following documents.
JJG 875 Digital pressure gauge
JJF 1008-2008 Pressure measurement terms and definitions
For dated reference documents, only the dated version applies to this regulation;
for undated references, the latest version (including all amendments) is
applicable to this regulation.
3 Terms and units of measurement
3.1 Terms
3.1.1 Pressure transmitter
An instrument that can convert a pressure variable into a standardized signal
that can be transmitted, the output signal of which has a given continuous
function relationship (usually a linear function) and the pressure variable.
3.1.2 Intellectual pressure transmitter
A pressure transmitter with automatic temperature compensation, linearity,
static pressure and other functions, as well as communication and self-
diagnosis functions.
3.2 Unit of measurement
The legal unit of measurement used by the pressure transmitter is Pa (Pascal),
or its decimal multiple units. kPa, MPa, etc.
4 Overview
Pressure transmitters are mainly used for the measurement and control of
pressure parameters in industrial processes.
The working principle of the pressure transmitter is to convert the pressure
signal into a usable output electrical signal according to a certain rule through
some conversion elements (usually a pressure sensor); the signal is amplified
5 Measurement performance requirements
5.1 Indication error
The indication error of the pressure transmitter is divided according to the
accuracy grade. It shall meet the maximum allowable error specified in Table 1.
5.2 Hysteresis
The hysteresis of the pressure transmitter shall meet the requirements of Table
1.
5.3 Effect of static pressure of differential pressure transmitter
The static pressure effect is only applicable to the differential pressure
transmitter; it is measured by the change in the output lower limit; its value shall
meet the requirements of Table 2.
6 General technical requirements
6.1 Appearance
6.1.1 The marking on the pressure transmitter shall be complete and clear;
meanwhile it shall have the following information. product name, exit-factory
number, production year, model specifications, measurement range,
6.1.2 The high-pressure and low-pressure chambers of the differential pressure
transmitter shall be clearly marked.
6.1.3 The connection terminals of the pressure transmitter shall have
corresponding marks.
6.2 Tightness
When the measuring part of the pressure transmitter is subjected to the upper
limit of the measured pressure (the differential pressure transmitter is the rated
working pressure), there shall be no leakage; the pressure value of the last 5
min shall not drop (or rise) beyond 2% of the upper limit of the measured
pressure.
6.3 Insulation resistance
When the ambient temperature is 15 ��C ~ 35 ��C and the relative humidity is 45%
~ 75%, the insulation resistance between the terminals (including the housing)
of the pressure transmitter shall not be less than 20 M�� (the test voltage is in
accordance with the enterprise standard).
6.4 Insulation strength
When the ambient temperature is 15 ��C ~ 35 ��C and the relative humidity is 45%
~ 75%, the test voltage of 50 Hz specified in Table 3 shall be applied between
the terminals (including the housing) of the pressure transmitter. There shall be
no breakdown and arcing after 1 min.
7 Measuring instrument control
The control of measuring instruments includes first verification, subsequent verification and in-use inspection.
7.1 Verification conditions
7.1.1 Verification equipment
The standard instruments and supporting equipment required for verification
can be selected according to the technical requirements of the pressure
transmitter to be inspected, referring to Table 4 to combine them into a complete
set.
7.1.2 Environmental conditions
7.1.3 Other conditions
Power supply. For the AC-powered pressure transmitter, its voltage change
does not exceed ��1% of the rated value; the frequency change does not exceed
��1% of the rated value. For DC-powered pressure transmitter, its voltage
change does not exceed ��1% of the rated value; the AC ripple shall meet the
requirements of Table 4.
7.2 Verification items
The verification items for the first verification, subsequent verification and in-
use inspection of the pressure transmitter are as shown in Table 5.
7.3 Verification method
7.3.1 Visual inspection
Visual observation and power-on inspection.
7.3.2 Tightness inspection
Increase (or evacuate) the pressure steadily so that the pressure in the
measuring chamber of the pressure transmitter reaches the upper limit of
measurement (or vacuum at 90% of the local atmospheric pressure). Turn off
the pressure source.
7.3.3 Verification of indication error
7.3.3.1 Connection and installation of equipment
7.3.3.3 Select verification point
The selection of verification points shall be basically evenly distributed
according to the range, generally it shall include no less than 5 points including
the upper limit and the lower limit (or within 10% of the input range near it).
Pressure transmitters with accuracy grades of 0.1 and above shall have no less
than 9 points. The zero point of the absolute pressure transmitter shall be as
small as possible, generally not greater than 1% of the range.
7.3.3.4 Adjustments before verification
Before verification, use the method of changing the input pressure to adjust the
output lower limit and upper limit of the pressure transmitter, to make it
consistent with the theoretical lower limit and upper limit. Generally, it can be
done by adjusting "zero point" and "full range".
7.3.6 Verification of insulation resistance
Disconnect the power supply of the pressure transmitter. Short-circuit the power
terminal and output terminal, respectively. Use an insulation resistance meter
to measure the insulation resistance between the power terminal and the
ground terminal (housing), the power terminal and the output terminal, the
output terminal and the ground terminal (housing). Except as otherwise
specified by the manufacturer, a megohmmeter with a rated voltage of 500 V is
generally used as the measuring equipment for the verification of the insulation
resistance of pressure transmitters.
7.3.7 Verification of insulation strength
Disconnect the power supply of the pressure transmitter; short-circuit the power
terminal and output terminal, respectively. According to the requirements of 6.4,
use a withstand voltage tester to measure the insulation strength between the
power terminal and the ground terminal (housing), the power terminal and the
output terminal, the output terminal and the ground terminal (housing).
7.4 Processing of verification results
7.4.1 The pressure transmitter that has passed the verification shall be issued
a verification certificate.
7.4.2 For pressure transmitters that are not qualified for verification, a
verification result notice shall be issued, which shall indicate the unqualified
items and content.
7.5 Verification cycle
The verification cycle of the pressure transmitter can be determined according
to the environmental conditions and frequency of use, generally not more than
1 year.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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