Proper Use Of Remote Diaphragm Seal Pressure Transmitters

The working principle of the SOLIDAT pressure sensor can be expressed as follows: the two pressures of the measured medium enter the high and low pressure chambers, act on the isolation diaphragms on both sides of the sensitive element, and transmit them to both sides of the measurement diaphragm through the isolation diaphragm and the filling liquid in the element. The measuring diaphragm of the remote diaphragm seal pressure transmitter and the electrodes on the insulating sheets on both sides each form a capacitor. When the pressure on both sides is inconsistent, the measuring diaphragm will be displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides is unequal. Through the oscillation and demodulation link, it is converted into a signal proportional to the pressure. The working principle of the diaphragm seal pressure transmitter and pressure transmitter absolute is the same as that of the differential pressure transmitter, the difference is that the pressure of the low pressure chamber is atmospheric pressure or vacuum.

1. Correct use of pressure transmitters

Prevent the pressure transmitter from contacting with corrosive or overheated media;

Prevent dregs from depositing in the conduit during use;

When measuring liquid pressure, the pressure tap should be opened on the side of the process pipeline to avoid depositing slag;

When measuring gas pressure, the pressure tap should be opened at the top of the process pipeline, and the remote diaphragm seal pressure transmitter should also be installed on the upper part of the process pipeline, so that the accumulated liquid can be easily injected into the process pipeline;

The pressure guiding pipe of the transmitter should be installed in a place where the temperature fluctuation is small;

When measuring steam or other high-temperature media, it is necessary to connect a condenser such as a buffer pipe (coil), and the operating temperature of the transmitter should not exceed the limit;

When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures to avoid the loss of the sensor caused by the expansion of the liquid in the pressure port due to freezing volume;

When measuring liquid pressure, the installation position of the diaphragm seal pressure transmitter should avoid the impact of the liquid (water hammer phenomenon), so as to avoid the pressure transmitter from being damaged by overpressure;

When wiring, pass the cable through the waterproof joint or flexible tube and tighten the sealing nut to prevent rainwater from leaking into the transmitter housing through the cable.