IM-P693-06
EMM Issue 1
6
LCS3050 Low Water Level Switch for two probes
2.1 Intended use
The level switch LCS3050 is used in conjunction with level probe LP40 to limit the water level in steam boilers
and (pressurised) hot-water plants.
Water level limiters switch off the heating when the water level falls below the set minimum level (low water).
2.2 Function
The level switch LCS3050 is designed for connecting one or two level probes. See section Schematic
representations of arrangements on page 10.
When the water level falls below the low level the level probes are exposed and a low level alarm is triggered
in the level switch. This switchpoint is determined by the length of the probe rod (level probe LP40).
After the de-energizing delay has elapsed, the two output contacts of the level switch will open the safety
circuit for the heating. The switching-off of the heating is interlocked in the external safety circuit and can
only be deactivated when the level probe enters the water again.
In addition, two signal outputs for external signalling devices close instantaneously.
An alarm will also be raised if a malfunction occurs in the level probe and/or the electrical connection.
An automatic self-testing routine monitors the safety functions in the level switch and the level probes. In the
event of a malfunction the safety circuit opens instantaneously and switches the heating off.
Alarm and error messages are indicated by LEDs and a signal output for each level probe is energized
without delay.
An alarm can be simulated by pressing the test button.
2. General product information
Fig. 1