JJG 1073-2011 PDF in English
JJG 1073-2011 (JJG1073-2011) PDF English
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Verification Regulation of Pressure Type SF6 Gas Density Monitors
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JJG 1073-2011: PDF in English JJG 1073-2011
NATIONAL METROLOGICAL VERIFICATION
REGULATION
OF THE PEOPLE'S REPUBLIC OF CHINA
Pressure Type SF6 Gas Density Monitors
压力式六氟化硫气体密度控制器
ISSUED ON. DECEMBER 28, 2011
IMPLEMENTED ON. MARCH 28, 2012
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine of the People's Republic of China
Table of Contents
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 General ... 5
5 Requirements for Metrological Performance ... 6
5.1 Accuracy Grade and Indication Error ... 6
5.2 Hysteresis Error ... 6
5.3 Zero Error ... 6
5.4 Rated Pressure Value Error ... 6
5.5 Tapping Displacement ... 6
5.6 Tightness ... 6
5.7 Smoothness of pointer deflection ... 6
5.8 Set-point Deviation and Switching Deviation ... 7
5.9 Temperature Compensation Error ... 7
6 General Technical Requirements ... 8
6.1 Exterior Structure ... 8
6.2 Insulation Resistance ... 9
6.3 Dielectric Strength ... 9
7 Measuring Devices Control ... 9
7.1 Verification Condition ... 9
7.2 Verification Items ... 10
7.3 Verification Methods ... 10
7.4 Verification Results Processing ... 13
7.5 Verification Period ... 13
Appendix A Record Format of SF6 Gas Density Controller ... 14
Appendix B Format of Content Page of Verification Certificate ... 16
Appendix C Format of Content Page of Verification Result Notice ... 17
References and Original Chinese Documents ... 18
Verification Regulation of Pressure
Type SF6 Gas Density Monitors
This Regulation was approved by the General Administration of Quality Supervision,
Inspection and Quarantine of the People's Republic of China on December 28, 2011 and
implemented on March 28, 2012.
Administrative organization. National Pressure Metering Technology Committee
Drafting organizations.
Henan Province Institute of Metrology
Shanghai Institute of Metrology Testing
Zhengzhou Sail Electronic Co., Ltd.
Xi'an Thermal Power Research Institute Co., Ltd.
Hongqi Instrument Co.Ltd.
National Pressure Metering Technology Committee was entrusted to be responsible for
the explanation of this Regulation.
Drafting staffs of this Specification.
Sun Xiaoquan (Henan Province Institute of Metrology)
Tu Limeng (Shanghai Institute of Metrology Testing)
Zhang Canli (Zhengzhou Sail Electronic Co., Ltd.)
Shi Yali (Xi'an Thermal Power Research Institute Co., Ltd.)
Zhang Xiaoming (Henan Province Institute of Metrology)
Zhou Chunlong (Hongqi Instrument Co.Ltd.)
NATIONAL METROLOGICAL VERIFICATION
REGULATION OF THE PEOPLE'S REPUBLIC OF CHINA
Verification Regulation of Pressure Type SF6
Gas Density Monitors
1 Scope
This Regulation is applicable to the initial verification, subsequent verification and
examination in service of pressure type SF6 gas density monitors or gas density relay
(hereinafter referred to as instrument) with measuring range of (-0.1~0.9) Mpa, the bourdon
tube as measuring element, with temperature compensating device and contact output
function.
2 Normative References
This Regulation quotes the following documents.
JJG 52-1999 Verification Regulation of Bourdon Tube Pressure Gauge Pressure -
Vacuum Gauge and Vacuum Gauge for General Use
GB/T 22065-2008 Pressure Type SF6 Gas Density Monitors
For dated references, only the edition cited applies; for undated references, the latest
edition of the reference document (including any amendments) applies.
3 Terms and Definitions
3.1 Rating pressure
Under standard atmosphere pressure conditions, SF6 gas pressure shall be filled to the air
chamber of the equipment as required before the equipment is put into operation or air supply.
3.2 Alarm pressure
Where the SF6 gas pressure in the air chamber of the equipment drops to a set value, the
instrument will give alarm signal and the set value is referred to as alarm pressure.
3.3 Atresia pressure
Where the SF6 gas pressure in the air chamber of the equipment drops to a set value, the
instrument will give atresia signal and the set value is referred to as atresia pressure.
3.4 Upper-limit alarm pressure
Where the SF6 gas pressure in the air chamber of the equipment exceeds a set value, the
instrument will sent out alarm or control signal through the connecting and disconnecting at
the connecting points and the set value is referred to as upper-limit alarm pressure.
3.5 Set-point deviation
The difference between the set value and the actual pressure at the signal switching of the
instrument
3.6 Switching deviation
At the same set-point, the difference between the actual pressures of the signal switching
on or switching off of the instrument
3.7 Static pressure test
The verification of indication error with the load removed after the instrument is
pressurized to upper limit of the measurement and the pressure is kept for 4h.
4 General
The instrument monitors SF6 gas density through the measurement of the SF6 gas
pressure in the airtight equipment.
The working principle and basic structure of the instrument is to add temperature
compensation function based on electric contact pressure gauge. The working principle is as
follows. that elastic deformation occurs to the internal spring under the pressure, so terminal
movement is caused, amplified through driving mechanism and transferred to indication
device after temperature compensation, and finally the measured pressure value is indicated
on the index plate through the pointer. Where the pressure drop to the alarm pressure or
atresia pressure, the instrument gives alarm or atresia signal through connecting and
Δt=|t2-t1|,°C;
t2- the ambient temperature with the arbitrary value within -20°C~60°C, °C;
t1=20°C;
K1- the temperature compensation coefficient (0.02 %/°C).
5.9.2 Where the ambient temperature is less than -20°C,
Δ2=±(Δ-20+K2Δt) (2)
Where,
Δ2 - the permissible value of temperature compensation error with ambient temperature
less than -20°C (calculated according to the percentage of measuring range);
Δ-20 - the permissible value of temperature compensation error with ambient temperature
being -20°C (calculated according to the percentage of measuring range);
Δt=|t2-t1|,°C;
t2 - the ambient temperature with the arbitrary value less than -20°C, °C;
t1=-20°C;
K2- the temperature compensation coefficient (0.05% /°C).
6 General Technical Requirements
6.1 Exterior Structure
6.1.1 The instrument shall be assembled firmly and free from looseness; the thread joint
shall be free from burr and damage; where the instrument filled with silicone oil is placed
vertically, the liquid level shall be at 70%~75% of the height of the instrument index plate and
the instrument shall be free from oil leakage.
6.1.2 The instrument shall be provided with the following marks.
Measurement unit, model, delivery No. measuring range, accuracy grade, manufacturer,
rated pressure value, alarm value, close down value and over-limit pressure alarm value.
Alarm value and close down value shall be in obvious different colors on the index plate
of the instrument so as to make a distinction between them.
6.1.3 Instrument glass shall be colorless and transparent, free from the defects or damage
hindering reading; the instrument in...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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