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GB/T 4830-2015Pressure range and quality of air supply for the industrial process measurement and control instruments (English PDF)

工业自动化仪表气源压力范围和质量

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 10, 2015

Implementation date

July 1, 2016

Scope

GB/T 4830-2015 is the English-translated version of 工业自动化仪表气源压力范围和质量.

GB/T 4830-2015 is the Chinese standard "Industrial process measurement and control instruments -- Pressure range and quality of air supply". Its scope clause reads: 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. Its clauses include terms and definitions; pressure range; quality.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on DECEMBER 10, 2015 and took effect on JULY 1, 2016.

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Document preview — GB/T 4830-2015

National Standard of the People's Republic of China

ICS: 25.040.40
Classification: N 10
Replacing: GB/T 4830-1984

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope4
2 Terms and Definitions4
3 Pressure Range4
4 Quality5
Appendix A (Informative) Test on Quality of Air Supply6
Appendix B (Informative) Relevant Formula and Chart8

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).

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. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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Editions of GB/T 4830

Edition	Title	Revision	Status
GB/T 4830-2015	Pressure range and quality of air supply for the industrial process measurement and control instruments	current edition	Current
GB/T 4830-1984	Pressure range and quality of air supply for the industrial process measurement and control instruments	previous edition	Superseded

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