Operating Modes - flamco WMS 2-1 Montage- Und Betriebsanleitung, Originalbetriebsanleitung

for testing. As a result, the contact with the water is interrupted simulating a lack of water.
The signaling unit immediately alerts. An integrated spring returns the inner electrode back
to the starting position.
Signaling unit
The signaling unit constantly monitors the conductance of the water or the electrical
resistance between the two electrodes of the sensor. If the measured conductance greater
than 20 µS, or the measured resistance is less than 50 k Ω the signaling unit indicates a
sufficient supply of heating water and an error-free sensor circuit. The red alarm lamp is
unlit. If the conductance is less than 20 µS, or the resistance is greater than 50 k Ω, this is
interpreted as a lack of water, wire break or defective sensor circuit. The red alarm lamp is
lit.
The WMS is designed to be fail-safe and self-monitoring. The electronics in the signaling
unit check the entire low water level protection system several times a second.
Errors in the sensor circuit and signaling unit are displayed as alarms. The low water level
protection system can only be released if the entire low water level protection system is
error-free, a sufficient power supply is available, and the water level is above the minimum;
i.e., the red alarm lamp is unlit and the built-in relay is energized.
The green power light is lit when the low water level protection system is supplied with
mains voltage. The test button allows a functional check which simulates an alarm
condition.
3.2

Operating modes

The WMS 2-1 has an internal power failure interlock; that is, after a power failure, the
signaling unit must be released via the "Release" button or via an external release contact
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