Instructions

Applications

A dry sensor behaves like an electric isolator. When the sensor is wet the resistance drops to some Kilo-Ohms

maximum. The electrical resistance of a sensor depends on the conductivity of the liquid, spacing between the

electrodes, and the wet areas of the electrodes. The specific conductivity of some liquids is so high that this

controller can’t detect them. Sometimes the problem may be solved by increasing the surface of the electrodes. To

avoid electrolysis or deposits on the sensor strips, the sensing voltage is alternating with a frequency around 1KHz.

INDICATOR / CONTROLLER

Connect both sensors.

ATTENTION : Place sensor S1 higher than sensor S2

NEVER USE sensors in an INFLAMMABLE ENVIRONMENT: when the sensors get dry

small sparks can occur which are able to ignite pockets of gas with a resultant

explosion. In a chemical environment (acids...) metal electrodes can erode. It may be

necessary to construct the electrodes of an inert metal e.g. inox.

LIQUID LEVEL

CONTROLLER