ME56T Electropneumatic Level Transmitter

The ME56T electropneumatic level transmitter uses the "bubbling-through principle". Via the throttle, compressed air is continuously bubbled into the sounding tube and into the liquid. Inside the sounding tube, a pressure equal to the pressure level in the liquid starts to builds up. A pressure sensor measures this pressure and the transmitter electronics converts this into a current signal between 4 ... 20 mA, which is proportional to the fluid level. In case the pressure inside the sounding tube exceeds the admissible over-pressure of the pressure sensor, the connection to the pressure sensor is interrupted by the safety valve, thus protecting it from overload and damage. A check valve prevents the backflow of fluid from the sounding valve into the air supply. The level transmitter shall be installed at above the tank or at its side. All connection lines must be fitted in such a way as to prevent mechanical forces acting upon the device.