Pressure test instrument type 1 test instrument 2 detects the uniform and vertical force acting on the unit area, that is, pressure, which is called a pressure instrument in engineering. The pressure of r is the gauge pressure. It has the functions of local instruction, recording, remote transmission and control.
Selection of pressure testing instruments
1. The technological production process requires measurement, including range and accuracy. In the case of static test (or slow change), it is stipulated that the maximum value of the measured pressure is 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 is the pressure gauge One-half of the full-scale value.
Commonly used pressure detection instruments have accuracy levels of 0.4, 1.0, 1.5 and 2.5, etc., and should be selected from the accuracy requirements of the production process and the most economical point of view. The maximum allowable error of the instrument is the product of the range of the pressure gauge and the percentage of the accuracy level. If the error value exceeds the accuracy required by the process, the pressure instrument with a higher accuracy level needs to be replaced.
2. The nature of the measured medium, such as state (gas, liquid), temperature, viscosity, corrosiveness, degree of legal pollution, flammability and explosiveness, etc. Such as oxygen meter, acetylene meter, with "oil-free" logo, special corrosion-resistant pressure gauge for special media, high temperature resistant pressure gauge, diaphragm pressure gauge, etc.
3. On-site environmental conditions, such as ambient temperature, corrosion, vibration, humidity, etc. Such as anti-vibration pressure gauge for vibration environment conditions.
4. Suitable for staff observation. According to the location of the detection instrument and the lighting situation, choose instruments with different table diameters (outer dimensions).