Immersion conductivity probes - sensing the water level of electrically conductive liquids

The C-IS-0504M module can be used for monitoring the water level in tanks, eg for controlling irrigation systems, etc. For monitoring the water level in the tank, it is inappropriate to measure the conductivity (resistance) with direct current (as in the case of a flood sensor), because electrolysis and destruction of electrodes.

We can connect 2 conductivity probes to the module (eg immersion probes PS-2, PS-3 manufactured by MAVE) see. following figure and monitor eg the maximum and minimum water level.

At the same time, the module can directly control the irrigation system pump and two relay outputs, as well as the valves for two irrigation circuits.

Three universal inputs can be used to measure water flow, temperature, etc.

Fig.1 Connection of the C-IS-0504M module with two conductivity probes for water level monitoring

Notes:

1. The flooded temperature sensor has a resistance in the order of tens of kΩ, the emerged electrodes have a resistance of more than 100 kΩ