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
Upper sensor
activated (closed
contact)
Red indicator light is on.
Pump
running
.
Alarm relay activated.
Lower sensor
activated (closed
contact)
Red indicator light is on.
Pump
stopped
.
Alarm relay activated.
For connection of the level control unit and alarm
output, see section Connection overview.
Related information
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
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.
Note
Connect the alarm relay only to voltages which comply with the SELV requirements in EN/IEC 60
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
Green LED
Red LED
Display
Alarm output
Pump running
On
Off
Normal indication
2
1
3
NC
NO
C
Set to stop
Flashing
Off
Normal indication
2
1
3
NC
NO
C
Pump fault
Off
On
EEPROM
2
1
3
NC
NO
C
Supply failure
Off
Off
Off
2
1
3
NC
NO
C
Pump running, low
chemical level
On
On
LOW
2
1
3
NC
NO
C
18
English (GB)
Summary of Contents for DME 150 AP
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