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Pressure gauge

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Pressure gauge is an instrument which is used for measuring and indicating the higher pressure than the environment. It is widely used in the field of industrial process and scientific research. In the heat pipe network, oil and gas transmission, water supply system, vehicle maintenance shop and other areas of the vehicle can be seen everywhere. Especially in industrial process control and technical measurement process, due to mechanical pressure gauge the elastic sensitive element with high mechanical strength and the production of convenience features, the mechanical pressure table has been more and more widely used.

The selection of pressure gauge should be based on the production requirements of the use of process, to do a detailed analysis of the specific circumstances. In the premise of meeting the requirements of the process, the principle of conservation should be considered in a comprehensive way, and the following aspects should be considered:

1, type selection

Selection of instrument type must meet the requirements of process production. Such as whether to remote transmission, automatic recording or alarming; of the measured medium properties (such as the measured level of medium temperature, viscosity size, corrosion, dirt, whether flammable and explosive) whether the special requirements of the instrument in site conditions (such as humidity, temperature, magnetic field strength and vibration of instrument types of requirements. Therefore, according to the process requirement, the instrument type is the important precondition to ensure the normal operation of the instrument and the safe production.

For example, the ordinary pressure gauge of the spring tube of copper alloy (high pressure using alloy steel), and ammonia with the pressure meter spring pipe material are used carbon steel (or stainless steel), does not allow the use of copper alloy. Because of the chemical reaction between ammonia and copper, it will explode, so ordinary pressure gauge can not be used for ammonia pressure measurement.

Oxygen pressure gauge and ordinary pressure gauge in the structure and material aspects can be exactly the same, only oxygen pressure gauge must be banned oil. Because the oil into the oxygen system is easy to cause explosion. The oxygen pressure gauge used in the calibration can not be used as a working medium with oil as the ordinary pressure gauge, and the oxygen pressure gauge should be strictly avoided. If you must use the existing oil pressure gauge measurement of oxygen pressure, the use of carbon tetrachloride must be repeated cleaning, carefully check until no oil pollution.

2, determine the scope of measurement

In order to ensure the elastic element can be in the elastic deformation range safety and reliable work, in the choice of the gauge range, must according to the measured speed of the size of the pressure and pressure changes, leaving enough room for, therefore, pressure meter limit value should be higher than the maximum pressure in the production process possible values. According to the regulation on chemical control design technique, in measuring the steady pressure, the maximum working pressure should not measure exceeds the upper limit value of 2 / 3; the measurement of fluctuating pressure, the maximum working pressure should not exceed the measuring limit value of 1 / 2; measurement of high pressure, the maximum working pressure should not over test limit on the amount of 3 / 5. The minimum value of the measured pressure should not be lower than the upper limit value of the instrument 1/3. In order to guarantee the linear relationship between the output and the output of the meter, the upper and lower limits of the instrument can be calculated according to the maximum value and the minimum value of the measured parameters, and the measuring range of the meter can not be directly used as the instrument. When we select the upper limit value of the instrument, we should choose the standard series. The standard series of pressure gauge measurement range in China include: -0.1-0.06,0.15; 0-1,1.6,2.5,4,6,10X10 "MPa (in which n is a natural integer, which can be positive and negative value).

3, the selection of accuracy level

According to the maximum absolute error of the process, the maximum reference error of the instrument is calculated, and the accuracy of the instrument is determined in the state regulation accuracy level. Generally speaking, the more precise the instrument used, the more accurate and reliable measurement results. But can not think of the selection of instrument accuracy, the higher the better, because the more sophisticated instruments generally more expensive price, operation and maintenance more trouble.

Choose examples:

1, used for measuring viscosity or acid-base and other special media, should use diaphragm pressure gauge, spring-loaded stainless steel tube, stainless steel core and a stainless steel casing or a bakelite casing.

According to the measured medium is different, in the color code on the pressure gauge should be provided, and indicate the name of special medium, oxygen table must be marked with red "ban on oil," the words, hydrogen is used dark green underline color, ammonia yellow underline color and so on.

2, against the wall when installing, should use pressure there are on the edge of the table; direct installation on the pipeline, should be used without edge pressure table; for direct measurement of gas, should use case behind the safety vent pressure gauge. For measuring position and easy to observe management considerations, should choose the size of the diameter of the case.

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