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-P693-22 EMM Issue 1
LCR2250 Level Controller
Description The LCR2250 level controller is used in combination with a LP20/LP21/PA420 level transmitter as a limit switch and water level controller, e.g. in steam and water boiler systems, or in condensate and feedwater tanks. The level controller indicates when a MIN or MAX water level has been reached, and opens or closes a control valve. The LCR2250 level controller processes the level-dependent current signal from the LP20/LP21/PA420 level transmitter. This input signal is recognised by the controller as 0 and 100 % of the boiler measuring range, and shown as an actual value on the 7-segment LED display. The controller is suitable for use with liquids having an electrical conductivity of 5 μS / cm or 5 ppm, when used with LP20/ LP21 capacitance probe and PA420 level transmitter. The level controller works with an electrically actuated control valve (VMD - Valve Motor Drive) as a 3-position stepping controller with proportional-plus-integral control action (PI controller). If the actual value deviates from the setpoint, the electric actuator is triggered by two output contacts and two flashing LEDs indicate whether the control valve is opening or closing. The controller can be configured for fill or discharge control. A further output contact indicates when a MIN or MAX water level is reached (the desired function can be selected by a switch). After the de-energizing time has elapsed, the output contact switches over and the MIN or MAX LED lights up. Faults in the level transmitter, the electrical connection or the settings are indicated as error codes on the 7-segment LED display. In the event of a malfunction, the MIN/MAX alarm is triggered. If faults occur only in the LCR2250 level controller, the MIN/MAX alarm is triggered and the system is restarted. Parameters can be changed or the MIN/MAX alarm simulated by operating the push buttons. For external level indication, the LCR2250 level controller has a 4 - 20 mA actual value output.
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Directives and standards VdTÜV Bulletin "Wasserstand 100" (Water Level 100) The LCR2250 level controller, in combination with the LP20/LP21/ PA420 level transmitter, is type approved to the VdTÜV Bulletin "Water Level 100". The VdTÜV "Wasserstand (=Water Level) 100" describes the requirements for water level control and limiting equipment for boilers. LV (Low Voltage Directive) and EMC (Electromagnetic Compatibility) The equipment conforms to the requirements of the Low Voltage Directive 2014/35/EU and the EMC Directive 2014/30/EU. ATEX (Atmosphère Explosible) The equipment must not be used in potentially explosive atmospheres, in accordance with European Directive 2014/34/EU .
Typical applications - Steam and Water Boilers - Condensate and feedwater tanks
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