The correct selection of pressure instruments mainly includes determining the type, range, range, accuracy and sensitivity of the instrument, external dimensions, and whether remote transmission is required and other functions, such as indication, recording, adjustment, and alarm.
The main basis for the selection of pressure instruments:
1. The requirements for measurement in the production process, including range and accuracy. In the case of static test (or slow change), the maximum value of the measured pressure shall be two-thirds of the full scale value of the pressure gauge; in the case of pulsating (fluctuating) pressure, the maximum value of the measured pressure shall be selected One-half of the full scale value of the pressure gauge.
The accuracy levels of common pressure detection instruments are 0.05, 0.1, 0.25, 0.4, 1.0, 1.5 and 2.5, which should be selected from the accuracy requirements and perspective of the production process. The maximum allowable error of the instrument is the product of the range of the pressure gauge and the percentage of the accuracy grade. If the error value exceeds the accuracy required by the process, the pressure gauge with a higher accuracy needs to be replaced.
2. Properties of the measured medium, such as state (gas, liquid), temperature, viscosity, corrosiveness, degree of contamination, flammability and explosion, etc. Such as oxygen meter, acetylene meter, with “no oil” sign, corrosion-resistant pressure gauge for special medium, high temperature pressure gauge, diaphragm pressure gauge, etc.
3. On-site environmental conditions, such as ambient temperature, corrosion, vibration, humidity, etc. Such as shock-proof pressure gauges for vibrating ambient conditions.
4. Suitable for staff observation. Select instruments with different diameters (outer dimensions) according to the location of the detection instrument and the lighting conditions
Post time: Mar-23-2022