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-P693-27 EMM Issue 1
LCS3051 High Water Level Switch
Description The level switch LCS3051 is used in conjunction with level probe LP41 as high level alarm in steam boilers and (pressurised) hot- water plants. A high level alarm prevents the water level from exceeding the preset max. water level (HW) and for this purpose switches off e.g. the feedwater supply. The level switch LCS3051 is designed for connecting one level probe. When the water level exceeds the MAX limit, the level probe enters the liquid and an alarm is triggered in the level switch. This switchpoint is determined by the length of the probe rod (level probe LP41). After the de-energizing delay has elapsed, both output contacts of the level switch will open the safety circuit, e. g. for the feedwater supply. If the deactivation of the feedwater supply is interlocked in the external safety circuit, the lockout can only be deactivated when the level probe is exposed again. 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 of the level switch. In the event of a malfunction the safety circuit opens instantaneously and switches off e. g. the feedwater supply. Alarm and malfunction messages are indicated by LEDs, and the signal output is instantaneously energized. An alarm can be simulated by pressing a test button.
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Directives and Standards Pressure Equipment Directive (PED) 2014/68/EU
The level switch LCS3051 in conjunction with level probe LP41 is 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 LCS3051 is certified according to IEC 61508 only if used in combination with level probe LP41. This standard describes the functional safety of safety-related electrical/electronic/programmable electronic systems. The equipment combination LP41 + LCS3051 corresponds to a type B subsystem with Safety Integrity Level (SIL) 2.
VdTÜV Bulletin “Wasserstand 100” (Water Level 100) The level switch LCS3051 in conjunction with the level probe LP41 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 (Electromagnetic Compatibility) The level switch LCS3051 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 LCS3051 must not be used in potentially explosive areas.
Typical Applications - Steam boilers - Pressurised hot-water plants
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