What are the main technical parameters in the selection of pressure gauges? Thanks
Pressure gauge material, surface diameter, size, installation methods, thread size can generally be determined
The selection of the pressure gauge mainly refers to the use environment, measuring medium, accuracy, range and shape size, at the same time in line with international standards or corresponding national standards.
The selection principle is as follows:TypeThe selection of instrument type must meet the requirement of process production. For example, whether remote automatic recording or alarm; by nature side medium (such as the temperature of the measured medium height, viscosity, corrosive, flammable and explosive, dirt etc.) whether to put forward special requirements on the instrumentation, on-site environmental conditions (such as temperature, humidity, magnetic field strength and the vibration of the instrument) type etc.. Therefore, according to the requirements of the process, the correct selection of instrument type is an important prerequisite to ensure the normal operation of the instrument and safety in production.Two, measuring rangeAccording to the maximum and minimum values of the measured parameters, the upper and lower limits of the instrument can be calculated, and the measuring range of the instrument can not be directly taken as the measuring range of the instrument. When we select the upper limit of the scale of the instrument, we should select it in the standard series stipulated by the state. China's pressure gauge measurement range standard series are: -0.1-0.06,0.15; 0-1,1.6,2.5,4,6,10X10 "MPa" (where n is a natural integer. Can be positive or negative).Three, accuracy levelAccording to the maximum absolute error permitted by the process and the best range of the selected instrument, the maximum reference error allowed by the instrument is calculated, and the accuracy of the instrument is determined in the precision grade specified by the state. Generally speaking, the more sophisticated the instrument is, the more accurate and reliable the measurement result is. But you can not believe that the higher the accuracy of the instrument used, because the more sophisticated instruments, the more expensive the general price, the more difficult to operate and maintenance.
