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JJG 882-2004 English PDF (JJG882-2004)

JJG 882-2004 English PDF (JJG882-2004)

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JJG 882-2004: Verification Regulation of the Pressure Transmitter

This Regulation applies to the stereotyped identification (or prototype test), initial verification, subsequent verification and in-service inspection of the pressure (including positive and negative gauge pressures, differential pressure and absolute pressure) transmitter.
JJG 882-2004
JJG
NATIONAL METROLOGICAL VERIFICATION REGULATION
OF THE PEOPLE REPUBLIC OF CHINA
Pressure Transmitter
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ISSUED ON. JUNE 4, 2004
IMPLEMENTED ON. DECEMBER 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China
Verification Regulation of the Pressure Transmitter
Replacing JJG 882-1994
This Regulation was approved by General Administration of Quality Supervision, Inspection and Quarantine of the PEOPLE Republic of China on June 4, 2004, and shall enter into force as of December 1, 2004.
Administration organization.
National Pressure Metrological Technology Committee.
Main drafting organization.
Shanghai Institute of Measurement and Testing Technology.
Participating drafting organization.
Hangzhou Tianyuan Instrument Co., Ltd.
This Regulation is entrusted to National Pressure Metrological Technology Committee for interpretation.
Main drafters of this Regulation.
Zhu Jialiang (Shanghai Institute of Measurement and Testing Technology) Tu Limeng (Shanghai Institute of Measurement and Testing Technology)
Participating drafter of this Regulation.
Li Yuan (Hangzhou Tianyuan Instrument Co., Ltd)
Table of Contents
1 Scope ... 5
2 Normative references ... 5
3 Overview ... 5
4 Metrological performance requirements ... 6
4.1 Measurement error ... 6
4.2 Hysteresis ... 7
4.3 Static pressure effects ... 7
5 General technical requirements ... 8
5.1 Appearance ... 8
5.2 Tightness ... 8
5.3 Insulation resistance ... 9
5.4 Insulating strength ... 9
6 Control of metrological instruments ... 9
6.2.4 Processing of verification results ... 18
6.2.5 Verification cycle ... 18
Appendix A Device connection method during the verification of
the pressure transmitter ... 19
Appendix B Test items and methods for stereotyped identification (or prototype test) ... 22
Appendix C Verification record format of the pressure transmitter ... 33 Appendix D Examples of uncertainty analysis ... 34
Appendix E Format of verification certificate and verification result notice (inner pages) ... 39
Verification Regulation of the Pressure Transmitter
1 Scope
This Regulation applies to the stereotyped identification (or prototype test), initial verification, subsequent verification and in-service inspection of the pressure (including positive and negative gauge pressures, differential pressure and absolute pressure) transmitter.
2 Normative references
This Regulation references the following literature.
JJF 1015-2002 General norm for pattern evaluation and pattern approval of measuring instruments
JJF 1016-2002 The rules for drafting program of pattern evaluation of
measuring instruments
JJG 875-1994 Verification regulation of digital pressure gauges
GB/T 17614.1-1998 Transmitters for use in industrial-process control
systems - Part 1. Methods of evaluating the performance
GB/T 17626.3-1998 Electromagnetic compatibility - Testing and
measurement techniques - Radiated, radio-frequency, electromagnetic field immunity test
When using this procedure, care should be taken to use the current valid version of the cited literature.
3 Overview
A pressure transmitter is a meter that converts a pressure variable into a transferable standardized output signal, and has a given continuous function relationship (usually a linear function) between the output signal and the pressure variable, which is mainly used for pressure parameter measurement and control in the industrial process. A differential pressure transmitter is often used for flow measurement.
Pressure transmitters can be divided into electric and pneumatic pressure transmitters. Electric standardized output signals are mainly 0mA to 10mA and 4mA to 20mA (or 1V to 5V) DC electric signals. Pneumatic standardized output 6.2.1 Verification conditions
6.2.1.1 Verification equipment
The standard instrument and ancillary equipment required for the verification can be selected and combined into a set according to the specifications of the pressure transmitter to be verified and by reference to Table 5. A complete set of standard equipment includes the entire verification equipment. During verification, the uncertainty U95 of the introduced expansion shall not exceed 1/4 of the absolute value of the maximum allowable error of the pressure transmitter to be verified. For the Level 0.1 and Level 0.05 pressure transmitters to be verified, the introduced U95 shall not exceed 1/3 of the absolute value of the maximum allowable error of the pressure transmitter to be verified. Refer to Appendix D for analysis.
6.2.1.2 Ambient conditions
a) Ambient temperature. 20??C ?? 5??C, and the change every 10min shall not be greater than 1??C; relative humidity. 45% to 75%.
b) The pressure transmitter should have no effect on the output of the stable mechanical vibration.
c) In addition to the geomagnetic field, there shall be no external magnetic fields affecting its normal working around the electric pressure transmitter.
6.2.1.3 Other conditions
a) Power supply. For the AC power supply pressure transmitters, the voltage change shall not exceed ??1% of the rated value, and the frequency change shall not exceed ??1% of the rated value; for the DC power supply pressure transmitters, the voltage change shall not exceed ??1% of the rated value. b) Gas source. The gas source pressure of the pneumatic pressure transmitter is 140kPa. The change shall not exceed ??1%. The gas source shall be free of oil and dust. The dew point shall be stable and 10??C below the pressure transmitter shell.
Note. If the pressure transmitter is to be verified on site and the environmental conditions and power conditions on the site do not meet the above requirements, it must be determined by uncertainty assessment. After analysis in the new conditions, only when the uncertainty U95 of the introduced expansion of the standard instrument and ancillary equipment still does not exceed 1/3 to 1/4 of the absolute value of the allowable error of the pressure transmitter to be verified can perform the on-site verification.
6.2.2 Verification items
ammeter as the
measurement
standard of the output
current signals of the
electric transmitter.
5 Pressure gauge Not lower than Level 1.6 Leakage test
6 Insulation resistance meter Output voltage. DC 500V, 100V Level 10
Insulation resistance
verification
7 Withstand voltage tester
Output voltage. AC 0V
to 1,500V
Frequency. 45Hz to
55Hz
Output power. Not lower
than 0.25kW
Insulation strength
verification
8 Vacuum unit
The vacuum degree of
the mechanical and
diffusion pumps shall
comply with the
requirements
Pressure sources of
the absolute pressure
transmitter and
negative pressure
transmitter
9 AC voltage regulator
220V, 50Hz, stability of
1%, power of not less
than 1kW
AC power supply of
the transmitter
10 DC voltage regulator 24V, allowable error of ??1%
DC power supply of
the transmitter
11 Air supply device and valuator
Stable output pressure.
126kPa to 154kPa,
allowable error of ??1%,
free of oil and dust, and
the dew point is stable
and 10??C below the
transmitter shell.
Gas source of the
pneumatic pressure
transmitter
6.2.3 Verification method
6.2.3.1 Appearance inspection
USE visual observation and power-on inspection, which shall meet the
For the transmitters with adjustable input range, the input range of the pressure transmitter under initial verification shall be respectively adjusted to largest and smallest for verification. For the pressure transmitters under subsequent verification and in-service inspection, they can only be
conducted with the verifications of common range or the range specified by the submitting personnel.
d) Adjustment before verification
Before verification, USE the method of changing the input pressure to adjust the output upper and lower limits, so as to be consistent with the theoretical upper and lower limits, which can be generally realized by adjusting the ?€?zero point?€? and ?€?full range?€?. For the pressure transmitter with the fieldbus, the ?€?zero point?€? and ?€?full range?€? of the input and output sections must be adjusted ...

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