Boiler house Level controls
2
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-P693-23 EMM Issue 1
LCR2251 Level Controller
2.3 105
Description The LCR2251 level controller is used in combination with the 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 and MAX water level has been reached, and controls a control valve or pump. The LCR2251 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 electro-pneumatically actuated control valve as a continuous controller with proportional-plus-integral control (PI controller). In the event of deviations from the setpoint, it outputs a current of 4-20 mA as manipulated variable Y. Alternatively the controller can be configured to control a pump (on/off control) and transmit a 4 - 20 mA to provide an external level indication (actual value output).
The controller can be configured for fill or discharge control.
If the MIN or MAX water level is reached, after the de-energizing delay the MIN or MAX output contact switches over in the level controller, 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 and MAX alarm is triggered.
If faults occur only in the LCR2251 level controller, the MIN and MAX alarm is triggered and the system is restarted.
Parameters can be changed or the MIN/MAX alarm simulated by operating the push buttons.
Page 1 of 4
Powered by FlippingBook