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Level Sensor
11. Level Sensor
The level sensor ENS monitors the upper and lower fill levels of a conductive fluid, for
example fresh or waste water. Its variable sensitivity means that it can also be used for other
mediums. Rod or wire electrodes are available for fluids or moist waste materials.
As a two-point regulator, via electrodes MAX and MIN in conjunction with earth connection C,
it controls pumps or valves for automatic filling or draining of storage vessels. The level range
to be controlled is therefore dependent on the relative positions of electrodes MAX and MIN.
The conductive wall of the storage vessel may be used as the earth connection C.
1. Sensitivity
A1
11
15
The response sensitivity can be continuously adjusted:
anti-clockwise potentiometer stop
C
MAX MIN
clockwise potentiometer stop
While putting into operation, set potentiometer "Sens." to
ENS
minimum value.
mecotron
A1
A2
After wetting the electrode MAX turn response sensivity "Sens."
12
11
to maximum value until relay level increases. Relay decreases,
14
1
when electrodes MAX and MIN are outside the liquid.
Sens.k
B1
B2 B3
2. Relay function
2
R
The LED is illuminated when the relay is activated
U
3
3. Power supply
Illuminated LED indicates presence of supply voltage.
14
12
A2
18
16
5 kΩ
100 kΩ
26
12. Checking the Lower and Upper Level Signals
1.
The appliance must be ready to operate.
2.
Testing the lower level signal for refilling.
2.1 Set the lever on the setting valve 6 to "Refill"
2.2 Slightly open the drain valve 21 , so that the system pressure of the downstream
system falls (this can be checked on the pressure gauge 19 .
2.3 When the lower level is reached, the backflow preventer will go to the flow position
(green no longer showing in the indicator window).
2.4 Slowly close drain valve 21 .
2.5 When the upper level is reached, the backflow preventer goes to the shutoff position
(open to atmosphere).
11
14
Sens.k
B1
B2 B3
R
U
Instructions for Checking the Lower and Upper Level Signals
19
18
11
14
Sens.k
B1
B2 B3
R
U
20
21
6
27
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