Level control and monitoring

There are different methods for the level control and monitoring the performance and reliability of which in a place in question are affected, among other factors, by the temporary conductivity, viscosity and composition as well as by the possible foaming. Movement of the media also sets, for example due to the mixers, limits for the measurement method to be selected.

Liquid level measurement

GESTRA has capacitive electrodes with integrated active transmitter (output signal 4–20 mA) or equipped with special amplifiers for the continuous level measurement where the communication between the sensor and the amplifier takes place in digital mode. If limit data is sufficient for the level control, the best solution is GESTRA’s conductive electrodes that can send out maximum four individual limit messages. A compact model is also available where four separate zero voltage change-over contacts have been integrated in the electrode. GESTRA’s level electrodes are designed for liquids the conductivity of which is at least 0.5 µS/cm. The pressure/temperature class of sensors is max. 32 bar(g) / 238 °C (PN 40). SMAR 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. 4–20 mA Hart and Profibus PA models or models to be connected to the FF bus are available.

For the measurement of medias containing solid matter

For the measurement of medias containing solid matter, we recommend the use of radar such as SMAR RD400. With the device, it is possible to reach 14-metre measurement range, and it can be programmed to send the information about the volume of the media in the tank instead of the level height data.