98

Catalogue EN 4.1

KESSEL AG

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

more pumps. If the level in the collecting tank continues to rise, an acoustic

alarm signal can be given via an alarm probe (which also measures the level

of the pumping medium).

Pressure sensor

Activates based on changes in

air pressure resulting from rising

or falling water levels in the tank.

Unsuitable for applications when

the pumps are very far away from

the control unit or if condensation

build up in the pressure tube is

an issue.

Conductance probe

Activated when a conductive

fluid permits current flow between

two measuring points – simple

and low-cost, but only works

with conductive fluids and cannot

be used for pumping rainwater

or condensate.

Float switch

Actuated by a float swimming

on the pumping medium’s

surface – simple and proven,

but not recommended for heavily

soiled wastewater, as material

deposits on the float can interfere

with level measurement.

Hydrostatic sensor

Based on the conversion of

different water pressure values

to analogue signals – can be

used to measure both alarm

and pumping levels with a single

sensor, but usually costs more

than other sensors and probes.

Optical probe

Detects moisture on the sensor

surface by monitoring the

refraction angle of an infrared

signal – ideal as an alarm probe

as it works reliably even after long

periods of inactivity, but can be

triggered by mistake when waste-

water is warm or heavily foaming.