Level transmitters
Level transmitters transmit information on level fluctuations to a controller, which manages the control valves and pumps based on the parameters provided.
Capacitive level measurement is a popular level measurement principle in industry. The sensor and the tank form the capacitor’s two electrodes. Whenever the surface level changes, the resulting change in capacitance is converted electronically into surface level data and the sensor sends a 4-20mA signal to the system.
Differential pressure transmitters and flanged level transmitters are designed for the same applications as the electrode-type sensors, as well as for applications where, for example, non-conductive liquids, chemicals, etc. are measured, or where the required pressure/temperature resistance is too high for the electrodes.
A transmitter based on hydrostatic pressure is submerged into the liquid measured from above.
A magnetic float transmitter is installed in the tank from above. Various connection options are available. A magnet inside the float generates a magnetic field to which the reed relays react; this results in constant level measurement. Level transmitters are also available for magnet-mediated level indicators, in which case local indication is supplemented by continuous measurement.