Boiler house Level controls
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Local regulations may restrict the use of this product to below the conditions quoted. In the interests of development and improvement of the product, we reserve the right to change the specification without notice. © Copyright 2020
TI-693-26 EMM Issue 1
LCS3050 Low Water Level Switch for two probes
Description 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). The level switch LCS3050 is designed for connecting one or two level probes. 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
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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. Alarms can be simulated by pressing a test button.
Directives and Standards Pressure Equipment Directive (PED) 2014/68/EU
Water level limiters are safety accessories as defined in the Pressure Equipment Directive (PED). The level switch LCS3050 in conjunction with level probe LP40 are EU type approved according to EN 12952/EN 12953. These Directives state, among other things, the requirements made on limiting systems and equipment for steam boiler plants and (pressurised) hot-water installations. Functional Safety acc. to IEC 61508 The level switch LCS3050 is certified acc. to IEC 61508 only if used in combination with level probe LP40. This standard describes the functional safety of safety-related electrical/electronic/programmable electronic systems. The equipment combination LP40 + LCS3050 corresponds to a type B subsystem with Safety Integrity Level (SIL) 3. VdTÜV Bulletin “Wasserstand 100” (Water Level 100)
The level switch LCS3050 in conjunction with the level probe LP40 is type approved according to the VdTÜV Bulletin “Water Level 100”. The VdTÜV Bulletin “Wasserstand (Water Level) 100” specifies the requirements made on water level control and limiting equipment for boilers. LV (Low Voltage) Directive and EMC (ElectromagneticCompatibility) The level switch LCS3050 meets the requirements of the Low Voltage Directive 2014/35/EU and the EMC Directive 2014/30/EU. ATEX (Atmosphère Explosible) According to the European Directive 2014/34/EU the level switch LCS3050 must not be used in potentially explosive areas.
Typical Applications - Steam boilers - Pressurised hot-water plants
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