GB/T 4830-2015 English PDF (GB/T4830-2015)

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GB/T 4830-2015: Industrial process measurement and control instruments -- Pressure range and quality of air supply
GB/T 4830-2015
Industrial process measurement and control instruments.Pressure range and quality of air supply
ICS 25.040.40
N10
National Standards of People's Republic of China
Replacing GB/T 4830-1984
Industrial automation instrument quality air supply pressure range and
Published 2015-12-10
2016-07-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China issued
Foreword
This standard was drafted in accordance with rules GB/T 1.1-2009 given.
Instead of the standard GB/T 4830-1984 "Industrial automation instrument air pressure range and quality." This standard GB/T 4830-1984
Compared, in addition to editorial changes, the main technical changes are as follows.
--- incremented by "1" and the subsequent provision No. postponed (see Chapter 1);
--- deleted the non-SI units (see 3.1,3.2.1,4.4, drawing version B.1,1984 2.1,2.2.1,3.3, Figure B.1);
--- increase "4.1 Overview", followed by Clause No. postponed (see Chapter 3 4.1,1984 edition);
--- A.2 the heading of "test equipment requirements" (see A.2,1984 version A.2);
--- with "kPa" instead of "mmHg", the corresponding conversion value is also concerned (see B.1.1, B.2,1984 version B.1.1, B.2);
--- with "MPa" instead of "mmHg" and "kg/cm2", the corresponding value is also related to the conversion (see B.1,1984 layout B.1).
The standard proposed by China Machinery Industry Federation.
This standard by the National Industrial Process Measurement and Control Standardization Technical Committee (SAC/TC124).
This standard was drafted. Southwestern University, Shenzhen Science and Technology Development Co., Ltd. Lee standard, Zhengzhou Municipal Engineering Design and Research Institute, China
Silian Instrument Group.
The main drafters. Zhouxue Lian, Chen Ru, Beijing segment Kui Liu into, He Qiang, Li Tao, Huang Renjie, Yang Songhua.
This standard supersedes the previous editions are.
--- GB/T 4830-1984.
Industrial automation instrument quality air supply pressure range and
1 Scope
This standard specifies the air pressure range and quality requirements of industrial automation instruments used.
This standard applies to industrial automation, instrumentation air is used.
2 Terms and Definitions
The following terms and definitions apply to this document.
2.1
Online pressure onlinepressure
The outlet pressure of the gas purifying apparatus to the instrument input transport network.
2.2
At ambient temperature limit ambienttemperaturelimit
Including purification device outlet, pipeline and instrumentation, including the entire system where the lowest temperature place.
3 pressure ranges
3.1 purge gas source outlet pressure range means
Air pressure range at the purge outlet means is. 300kPa ~ 500kPa and 500kPa ~ 800kPa.
Air pressure in the range of 3.2 meter input
3.2.1 Instrument input supply pressure nominal values. 140kPa, 260kPa, 350kPa, 550kPa and 700kPa.
3.2.2 Air pressure meter allowable fluctuation range of the input of ± 10% of its nominal value.
4 Quality
4.1 Overview
Test methods and formulas air quality applications graph see Appendix A and Appendix B.
4.2 Dew point
Dewpoint air line pressure at ambient temperature limit ≤ -10 ℃.
4.3 dust particle size
Air supply dust particle ≤3μm.
4.4 oil content
Air supply oil content of ≤10mg/m3.
4.5 Pollutants
Air supply should be no harmful gases or vapors.
NOTE. In individual cases, the special requirements of air quality of the gas supply system shall be designed, manufactured and user departments agreed.
Appendix A
(Informative)
Air quality tests
A.1 testing purposes
Whether the inspection and monitoring air quality meets the requirements of this standard, provide the basis for timely detection and elimination of the gas supply device failure.
A.2 Test equipment requirements
Where all the equipment used in the testing, calibration and verification should be carried out as specified or required by the relevant departments.
A.3 Test Project
A.3.1 dew point.
A.3.2 dust particle size.
A.3.3 oil content.
A.4 Test Methods
A.4.1 dew point test method
With accuracy not less than ± 10% (volume per million) measurements trace water analyzer according to the relevant data obtained formula (curve or table
Grid) for conversion.
A.4.2 dust particle test method
Counting light scattering principle.
A.4.3 oil content test method
Sampling mode. CCl4 (carbon tetrachloride) absorption method.
Analysis. spectrophotometric method.
Test system diagram shown in Figure A.1.
Test system diagram Figure A.1
Appendix B
(Informative)
On formulas and charts
B.1 water content unit conversion formula
B.1.1 trace water content of the air in terms of parts per million by volume and the dew point temperature.
Where.
PH2O --- corresponding to a dew point temperature of the saturated vapor pressure, kPa;
P --- total pressure, i.e. the standard atmospheric pressure to calculate 101.325kPa;
Found C --- water content (ppm by volume), 10-6.
To look-up table values may be pH2O dew point temperature.
B.1.2 relationship atmospheric pressure dew point and the dew point of the curve shown in Figure B.1.
B.2 oil content unit conversion mode
Oil content per unit of mass ppm and mg/m3 conversion formula.
Found C --- oil content (oil content mass ratio of parts per million), 10-6;
Found D --- oil content, mg/m3;
1.205 --- 25 ℃, air density at 101.3kPa state, kg/m3.
B.1 graph of the atmospheric pressure dew point of the dew point