Knowledge of Pressure Gauges
Dec 06,2023
In every link of industrial production, pressure monitoring is like a "barometer" for the operation of equipment, and the accurate selection of pressure gauges is the key to ensuring the reliability of pressure data.
From the pressure monitoring of chemical reaction kettles to the pressure regulation of urban water supply systems, the performance of pressure gauges is directly related to production safety and efficiency.
Now that we have a general understanding of the classification of various accuracy grades of pressure gauges, let's briefly describe the key points in selecting a pressure gauge:
1.The minimum division of a pressure gauge can be commonly regarded as its resolution, but it is not necessarily the accuracy of the gauge.
The minimum division (also known as the minimum scale or division value) of a pressure gauge refers to the pressure difference represented between two adjacent scale lines on the dial. There is a certain error between the measured value and the true value, and the range of this error is actually the accuracy. Therefore, the smaller the accuracy value, the closer the displayed value of the detection instrument is to the true value, and the higher the reliability.
2.Determination of the accuracy grade of the pressure gauge: The accuracy grade should be determined according to the requirements put forward by the production process, economic practicality, detection methods, etc., based on the allowable error required by the minimum value of the measured pressure.
Selection of the range of the pressure gauge
(1) When measuring stable pressure, the maximum working pressure should not exceed 2/3 of the range.
(2) When measuring pulsating pressure, the maximum working pressure should not exceed 1/2 of the range.
(3) When measuring high pressure, the maximum working pressure should not exceed 3/5 of the range.
(4) To ensure measurement accuracy, the minimum working pressure should not be lower than 1/3 of the range.
In accordance with the above principles, after calculating a value based on the maximum measured pressure, select a value from the pressure gauge range series that is slightly larger than this value as the selected range.
3.Selection of the type of pressure gauge
Different types of pressure gauges should be selected for measuring different media and using environments.
(1) For general media, such as air, water, steam, oil, etc., ordinary pressure gauges can be used.
(2) Special pressure gauges are required for special media, such as ammonia pressure gauges for ammonia; oxygen pressure gauges for oxygen; pressure gauges for hydrogen; acetylene pressure gauges for acetylene, etc.
(3) For general corrosive media and environments with corrosive gases, stainless steel pressure gauges can be selected.
(4) For measuring the pressure of liquids, gases with high viscosity, easy crystallization, strong corrosion, high temperature, or media with solid suspended matter, diaphragm pressure gauges should be selected.
(5) For pressure measurement in occasions with pulsating media and mechanical vibration, shock - resistant pressure gauges should be selected.
(6) When remote transmission is required, remote - transmission pressure gauges can be selected, and the remote transmission signals include current type, resistance type and voltage type.
(7) When control and protection requirements are required, electric contact pressure gauges can be selected.
(8) When explosion - proof requirements are required, explosion - proof types must be selected, such as explosion - proof electric contact pressure gauges.
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