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Level sensors / probes and alarm probes

Level sensors and probes measure the level of the pumping medium in the collecting tank of a lifting station and trigger the pumping process of one or several pumps from a specified filling level onward. If the level in the collecting tank continues to rise, an acoustic warning signal can be give via an alarm probe (which also measures the level of the pumping medium).

Pressure sensor

The closed air volume within a pressure sensor is compressed by a rising water level in the collecting tank of a lifting station. The resulting difference in air pressure is measured by a pressure sensor in the control unit and used to regulate the starting and stopping of the lifting station pumping process. Pneumatic level measurement is a straightforward and low-cost method of level measurement, but does have disadvantages when the system is used irregularly, when wastewater is extremely greasy or when pressure hoses are very long or condensate in the pressure hose impedes measurement.

Float switch (floater)

Float switches are switching devices which are actuated by a float which swims on the surface of the pumping medium. If the water level rises within the collecting tank, the switching device is triggered via the change in level of the float, and the lifting station pump is activated. Float switches are a simple and proven type of level measurement. They have some weaknesses when heavily soiled wastewater is to be pumped, since material becomes deposited on the float and can interfere with level measurement.

Hydrostatic sensor

With this method of hydrostatic pressure measurement, the water pressure is measured using a semiconductor and the downstream electronics generate an analogue signal from this. The pumps are activated from a specified level onward. A hydrostatic sensor can be used to measure different levels. This makes it possible to measure both the alarm level and pumping level and save on a second probe. However, such hydrostatic sensors usually cost more than other level probes.

Optical probe

In addition to the level sensors described above, an optical probe can be used as an alarm probe. If the sensor surface becomes wet, the refraction angle of an infrared signal changes, signalling that the alarm level has been reached. The optical probe is ideal as an alarm probe since it works reliably even if it has not been in use for a long time. An alarm can be triggered by mistake, however, when the wastewater is warm (dripping condensate) or heavily foaming.

Product Range

The wide range of KESSEL lifting stations complies with all legal requirements for different installation situations:


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