How to choose the pressure gauge range? How to choose the pressure gauge range:
In order to ensure that the elastic element of the pressure gauge can work reliably within the safe range of elastic deformation, the selection of the pressure gauge range should not only be based on the size of the measured pressure, but also consider the speed of the measured pressure change. enough room.
1. When using a pressure gauge to measure stable pressure, the maximum working pressure should not exceed 2/3 of the range;
2. Use a pressure gauge to measure the pulsating pressure, and the maximum working pressure should not exceed 1/2 of the range;
3. When using a pressure gauge to measure high pressure, the maximum working pressure should not exceed 3/5 of the range. In order to ensure the measurement accuracy, the minimum working pressure should not be lower than 1/3 of the measuring range. According to this principle, after calculating a value according to the measured maximum pressure, select a measurement range slightly larger than this value from the pressure gauge product catalog.
4. It should be selected according to the working pressure of the boiler. The limit value of the scale range should be 1.5~3.0 times of the working pressure, preferably 2 times.
For example, it is correct to select (0- -1) MP range for the steam pressure gauge of a factory. In the process of steam heating, the pressure is constantly beating. Its maximum pressure is generally 0.4~0.45MP. When selecting a pressure gauge, it should be lower than 1/2 of the total range and greater than 1/3 of the total range. . In the selection of (0-1) MP pressure gauge, it meets the requirements. This choice not only meets the accuracy requirements, but also prolongs the service life of the pressure gauge. Another example is the pressure of the kettle. The reaction kettle is a very large container, and its pressure rise is relatively stable. When selecting a meter, the maximum working pressure should not exceed 2/3 of the range, and should not be lower than 1/3 of the range. Generally choose (0-0.6) MP.
Steam pressure gauge - generally choose (0~1) MP;
The pressure of the reactor is generally selected (0~0.6) MP;
The vacuum of the reactor is generally selected from (-0.1~0) MP;
Vacuum buffer package one - generally choose (-0.1~0) MP;
The compressed air buffer package is generally selected (0~1) MP;
For other special process requirements, various equipment and instruments should be carefully selected according to the specific situation. Establish a complete metering point database and equipment ledger.
Summary: When measuring stable load, the measured load should not exceed 2/3 of the upper limit of the pressure gauge; when measuring fluctuating pressure, the measured load should not exceed 1/2 of the upper limit of the pressure gauge; the minimum pressure measured by the pressure gauge should not be lower than 1 of the upper limit of the pressure gauge. /3.
