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GB/T 4830-2015 English PDF (GBT4830-2015)

GB/T 4830-2015 English PDF (GBT4830-2015)

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GB/T 4830-2015: Industrial process measurement and control instruments -- Pressure range and quality of air supply

This Standard specifies the requirements for pressure range and quality of air supply for industrial process measurement and control instruments. This Standard is applicable to the air supply used by the industrial process measurement and control instruments.
GB/T 4830-2015
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 25.040.40
N 10
Replacing GB/T 4830-1984
Industrial Process
Measurement and Control Instruments ?€?
Pressure Range and Quality of Air Supply
ISSUED ON. DECEMBER 10, 2015
IMPLEMENTED ON. JULY 1, 2016
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Terms and Definitions ... 4
3 Pressure Range ... 4
4 Quality ... 5
Appendix A (Informative) Test on Quality of Air Supply ... 6
Appendix B (Informative) Relevant Formula and Chart ... 8
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard replaced GB/T 4830-1984 Pressure Range and Quality of Air Supply for the Industrial Process Measurement and Control Instruments. Compared with GB/T 4830-1984, this Standard has the following major technical changes besides the editorial modification.
--- Add ?€?1 Scope?€?, the clause numbers thereafter shall be postponed (see Chapter 1);
--- Delete non-international units (see 3.1, 3.2.1, 4.4, Figure B.1 of this Edition; 2.1, 2.2.1, 3.3 Figure B.1 of 1984 Edition);
--- Add ?€?4.1 Overview?€?, the clause numbers thereafter shall be postponed (see 4.1 of this Edition; Chapter 3 of 1984 Edition);
--- Add A.2 title ?€?Requirements for test equipment?€? (see A.2 of this Edition; A.2 of 1984 Edition);
--- Replace ?€?mmHg?€? by ?€?kPa?€?, corresponding values are also converted (see B.1.1, B.2 of this Edition; B.1.1, B.2 of 1984 Edition);
--- Replace ?€?mmHg?€? and ?€?kg/cm2?€? by ?€?MPa?€?, the corresponding values are also converted (see Figure B.1of this Edition; Figure B.1 of 1984 Edition).
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee for Standardization of Industrial Process Measurement and Control (SAC/TC 124). Drafting organizations of this Standard. Southwest University, Shenzhen Libiao Technology Development Co., Ltd., Zhenzhou City Municipal Engineering Design and Research Institute, and China Silian Instrument Group Co., Ltd.
Chief drafting staffs of this Standard. Zhou Xuelian, Chen Ru, Duan Jingkui, Liu Jin, He Qiang, Li Tao, Huang Renjie, and Yang Songhua.
The historical edition replaced by this Standard is as follows.
--- GB/T 4830-1984.
Industrial Process
Measurement and Control Instruments ?€?
Pressure Range and Quality of Air Supply
1 Scope
This Standard specifies the requirements for pressure range and quality of air supply for industrial process measurement and control instruments.
This Standard is applicable to the air supply used by the industrial process measurement and control instruments.
2 Terms and Definitions
The following terms and definitions are applicable to this document.
2.1 On line pressure
The gas pressure delivered from the purifying device outlet to the instrument input end pipe network.
2.2 Ambient temperature limit
The minimum temperature on the site where there is a whole system including the purifying device outlet, pipe network and instrument.
3 Pressure Range
3.1 Pressure range of air supply on the purifying device outlet
The pressure range of air supply on the purifying device outlet is 300kPa~500kPa; and 500kPa~800kPa.
3.2 Pressure range of air supply on the instrument input end
3.2.1 The nominal pressure value of air supply on the instrument input end is 140kPa, 260kPa, 350kPa, 550kPa and 700kPa.
3.2.2 The allowable pressure fluctuation range of air supply on the instrument input Appendix A
(Informative)
Test on Quality of Air Supply
A.1 Test objective
Check and supervise whether the quality of air supply meets the requirements of this Standard; so provide basis timely for detecting and eliminating the failure of air supply system.
A.2 Requirements for test equipment
All instruments and equipment used in the test shall be verified and calibrated according to the provisions or requirements of relevant departments.
A.3 Test Items
A.3.1 Dew point.
A.3.2 Dust-contained particle size.
A.3.3 Oil content
A.4 Test methods
A.4.1 Test method on dew point
Measure by trace water analyzer with accuracy no less than ??10% (volume ratio ppm); the obtained data shall be converted as per relevant formula (curve or table). A.4.2 Test method on dust-contained particle size
Adopt the light scattering principle counting method.
A.4.3 Test method on oil content
Sampling mode. CCl4 (carbon tetrachloride) absorption method.
Analyzing method. spectrophotometry.
The simple chart of test system can refer to Figure A.1.

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