Pressure (differential pressure) the correct selection of instrumentation
Correct selection of pressure instrumentation include determining instrument type, range, range, accuracy and sensitivity, overall dimensions and the need for long-distance transmission and other features, such as indicating, recording, control, alarm, etc. The main basis for selection:
1. Production requirements for measurement, including the range and accuracy. In a static test (or slowly) without requiring maximum selection of the measured pressure gauges full scale value two-thirds; pulsating (fluctuations) under pressure, the maximum value for the measured pressure use pressure gauges full scale value of the one-second. Commonly used pressure test gauges accuracy class 0. Level 4, 1. Class 0 and 1. Level 5 and 2. 5 level 4 level, selection from the point accuracy requirements and the most economical production. Maximum permissible error of the instrument is multiplied by the percentage range and accuracy of the pressure gauge, if the error exceeds process requirements of accuracy, you need to replace the high accuracy level of pressure instruments.
2. Measured properties of the medium, such as the State (gas, liquid) viscosity, temperature, dirt, corrosion resistance, law degree, degree of flammable and explosive. Such as oxygen, acetylene tables, with the "no oil" logo, designed corrosion-resistant pressure gauge for specific media, high temperature resistant pressure gauges, diaphragm pressure gauges, etc. 3. On-site environmental conditions such as ambient temperature, corrosion, vibrations, moisture level and so on. As for vibration, shock-proof pressure gauge environmental conditions.
4. Is suitable for observation of staff. According to the instrumentation location and lighting selection table size (dimensions), ranging from instruments. Source: http://www.zhaohuisensor.com/
