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JJG 882-2004

Chinese Standard: 'JJG 882-2004'
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Detail Information of JJG 882-2004; JJG882-2004
Description (Translated English): Verification Regulation of the Pressure Transmitter
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A53
Classification of International Standard: 17.100
Word Count Estimation: 28,000
Date of Issue: 2004-06-04
Date of Implementation: 2004-12-01
Older Standard (superseded by this standard): JJG 882-1994
Quoted Standard: JJF 1015; JJF 1016; JJG 875; GB/T 17614.1; GB/T 17626.3
Drafting Organization: Shanghai Measurement and Testing Technology
Administrative Organization: Technical Committee of the National Pressure Measurement
Issuing agency(ies): State Administration of Quality Supervision, Inspection and Quarantine
Summary: This standard applies to the pressure (including the positive and negative gauge pressure, differential pressure and absolute pressure) transmitter shape identification (or prototype test), initial verification, testing and use of follow-up inspection.

JJG 882-2004
JJG
NATIONAL METROLOGICAL VERIFICATION REGULATION
OF THE PEOPLE’S REPUBLIC OF CHINA
Pressure Transmitter
压力变送器
ISSUED ON. JUNE 4, 2004
IMPLEMENTED ON. DECEMBER 1, 2004
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People’s 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’s 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, ......
Related standard:   JJG 877-2011  JJG 875-2005
   
 
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