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-P693-21 EMM Issue 1
Description The functional unit consisting of the operating and display unit BHD50, blowdown controller BCR3250 and conductivity probes CP10, CP30/CP40 and CP32/CP42 is used as blowdown controller and limiter. Typical applications include steam boilers, (pressurised) hot- water installations as well as condensate and feedwater tanks. A Pt100 temperature sensor may be connected to the controller to display the boiler water temperature and provide temperature compensation. This is recommended if the boiler is working at varying pressures, or for other applications such as condensate monitoring or coil boilers, where the temperature may vary. The blowdown controller indicates when the preset MAX TDS/Conductivity is reached, opens or closes a blowdown valve and may also control a bottom blowdown valve. The controller can provide either a MIN alarm or a bottom blowdown timer function. One BHD50 can be used with a LCR2652 and a BCR3250 controller to provide a combined level and TDS control system. The operating and display unit BHD50 and the blowdown controller BCR3250 form a functional unit featuring the following properties: BCR3250 BHD50 Blowdown Controller, Operating and Display Unit
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- TDS/Conductivity control and limiter using conductivity probes CP10 or CP30/CP40, with or without a separate temperature sensor Pt 100 (TP20) to provide temperature compensation (0 - 250 o C) - TDS/Conductivity control and limiter using conductivity probe CP32/CP42, with an integrated temperature sensor (temperature compensation), scale management and optional alarm - Electronic probe cleaning, to remove scale from probe tip - Modulating control using a valve motor drive (VMD) by proportional-plus-integral control action (PI controller) on an electrical blowdown valve A 3-position stepping control is used, therefore no feedback potentiometer is required - ON/OFF control with purge time for probe in pipeline installations - An optional filter to increase damping effects, to avoid over- frequent valve operation - Indication of MAX TDS/Conductivity limit (TDS/Conductivity limiter) - Indication of MIN TDS/Conductivity limit or control of a bottom blowdown valve - Conductivity to TDS conversion (unit in μS/cm or ppm) - Standby/burner input (24 Vdc), to reduce boiler water loss, if the boiler is on standby or low demand - Real time clock controlled Bottom Blowdown (BB), with limit switch box and priority link for multiple boiler applications (interlocking up to 9 BCR3250 or BT1050 controllers) - Actual value output 4-20 mA - Indication of actual value (indicated in ppm or µS/cm and as bar graph)
- Indication/adjustment of control parameters and settings - Trend record - Indication and listing of errors, alarms and warnings - Test of MIN/MAX output relays - Manual/automatic operation - Modbus RTU (RS232, RS422 or RS485) and Modbus TCP (Ethernet 10/100Mb) communication - Password protection Typical applications - Steam Boilers - Hot-Water Installations - Condensate and Feedwater Tanks
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