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2.1.3 Operating modes
SE pumps
•
Continuous operation: The pump runs
continuously.
•
Intermittent operation: Within a duty cycle of 1
minute, the pump must be stopped for 30 seconds
to cool down.
SL pumps
•
Intermittent operation: Within a duty cycle of 1
minute, the pump must be stopped for 30 seconds
to cool down. The maximum ambient temperature
is 30 °C.
We recommend maximum 30 starts per hour for both
pump types. However, 60 starts per hour within a two-
hour period at peak load are allowed. The purpose is
to minimise wear of the shaft seal, bearings and
motor.
For further information, see the installation and
operating instructions for the pumps.
2.1.4 Motor protection
A thermal switch is incorporated in the motor
windings. A motor-protective circuit breaker is
incorporated in the control cabinet, and the controller
has an additional current measurement function.
2.1.5 Level sensor
The level sensor consists of a piezoresistive pressure
sensor and a pressure tube connected by a pressure
hose. The pressure tube is located underneath the
screw cap and extends down into the tank. The screw
cap includes a condensate trap and a connection for
the tube. You can remove the pressure tube for
maintenance, service and cleaning. The pressure
sensor measures the liquid level in the tank. The
rising liquid level compresses the air inside the
pressure tube and hose, and the piezoresistive
pressure sensor transforms the changing pressure
into an analog signal. The controller uses the analog
signal to start and stop the pump and to indicate high-
level alarm.
Pos.
Description
Hose connecting the pressure tube with the
1
pressure sensor
2
Screw cap
3
Pressure tube
Related information
7.2.2 Cleaning the pressure tube and hose
1
2
3
7
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