When measuring special media such as viscosity or acid base, diaphragm pressure gauges, stainless steel spring tubes, stainless steel movements, stainless steel housings, or bakelite housings should be selected. According to the different media tested, the pressure gauge should have a specified color code and indicate the name of the special media. The oxygen gauge must be marked with the words "No Oil" in red, the hydrogen should use a dark green lower horizontal line color code, and the ammonia should use a yellow lower horizontal line color code.

The instrument must be vertical: During installation, a 17mm wrench should be used to tighten it, and the case should not be forcibly twisted; Avoid collision during transportation; The instrument should be used at an ambient temperature of - 25~55 ℃; The vibration frequency of the working environment is<25HZ, and the amplitude is not greater than 1mm; Due to excessive ambient temperature during use, if the indicated value of the instrument does not return to the zero position or the indicated value exceeds the tolerance, the sealing rubber plug on the upper part of the case can be cut open to allow the inner chamber of the instrument to communicate with the atmosphere;