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5.4 Level control
The pump can be fitted with a level control unit for
monitoring of the chemical level in the tank.
The pump can react to two level signals. The pump
will react differently, depending on the influence on
the individual level sensors.
Level sensors
Pump reaction
Red indicator light is on.
Upper sensor
activated (closed
Pump running.
contact)
Alarm relay activated.
Red indicator light is on.
Lower sensor
activated (closed
Pump stopped.
contact)
Alarm relay activated.
For connection of the level control unit and alarm
output, see section Connection overview.
5.6 Alarm output and indicator lights
The green and red indicator lights on the pump are used for operating and fault indication.
In control variant "AR", the pump can activate an external alarm signal by means of a built-in alarm relay which
must only be connected to a safety extra low voltage (SELV) connection.
Connect the alarm relay only to voltages which comply with the SELV requirements in EN/IEC 60
Note
335-1.
The alarm signal is activated by means of an internal potential-free contact.
The functions of the indicator lights and the built-in alarm relay appear from the table below.
Condition
Pump running
Set to stop
Pump fault
Supply failure
Pump running, low
1)
chemical level
18
Green LED
Red LED
On
Flashing
Off
Off
On
Related information
4.6 Connection overview
5.5 Diaphragm leakage sensor
The pump can be fitted with a diaphragm leakage
sensor, which detects diaphragm leakage.
The sensor should be connected to the drain hole in
the dosing head.
In case of diaphragm leakage, the signal from the
sensor generates an alarm and the alarm relay will be
activated. See also section Alarm output and indicator
lights.
For connection of the diaphragm leakage sensor, see
section Connection overview.
Related information
4.6 Connection overview
5.6 Alarm output and indicator lights
Display
Off
Normal indication
Off
Normal indication
On
EEPROM
Off
Off
On
LOW
Alarm output
1
2
3
C
NO
NC
1
2
3
C
NO
NC
1
2
3
C
NO
NC
1
2
3
C
NO
NC
1
2
3
C
NO
NC
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