Shanghai YichuanRemote pressure gauges are suitable for measuring the pressure of liquids, vapors, gases, and other media that do not corrode steel and copper alloys. Because a sliding line resistance transmitter is installed inside the resistance remote transmission pressure gauge, the measured value can be transmitted as electricity to a secondary instrument far away from the measurement, achieving centralized detection and remote control. In addition, this pressure gauge [2] can also indicate pressure on site for easy on-site inspection. 1. No water does not mean no pressure. If the pipeline is sealed, the pointer should reflect the static pressure inside the pipeline. However, if the pipeline is not very sealed and there is no water, the pointer should be at zero position; 2. The remote pressure gauge is only a contact signal, which is the output of the relay, so it is only necessary to determine whether the pressure gauge contact is closed properly. In general, it will not affect the working status of the frequency converter.