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 from the pressure gauge One-half of the full-scale value.

IP protection level is composed of two numbers. The first number represents the level of dust prevention and prevention of foreign invasion; The second number indicates the tightness against moisture and water intrusion. The larger the number, the higher the protection level. The protection level represented by the two marked numbers is described as follows

1. The instrument must be vertical: during installation, a 17mm wrench should be used to tighten it, and the case should not be forced to twist; Avoid collision during transportation; 2. The instrument should be used at the ambient temperature of - 25 ~ 55 ℃; 3. The vibration frequency in the working environment is less than 25Hz and the amplitude is no more than 1mm;