BCR3250, BHD50

Blowdown Controller

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) hotwater 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:

  • 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 oC)
  • 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 overfrequent 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
  • Steam Boilers
  • Hot-Water Installations
  • Condensate and Feedwater Tanks
Supply voltage 24 Vdc +/– 20%
Fuse external 0.5 A (semi-delay)
Power consumption 5 W
Inputs 1 five-wire connection to CP32/CP42 or three-wire connection to CP30/CP40 and two-wire connection to the CP10 (Drive+Sense bridged at controller)
1 two-wire Pt100 temperature sensor (range 0 – 250°C)
1 two-wire bottom blowdown valve switch
1 two-wire bottom blowdown link (blowdown valve interlocking)
1 two-wire standby or burner connection (24Vdc +/– 20%, 10mA)
Outputs 1 or 2 volt-free change-over contacts, 8 A 250 Vac/30 Vdc cos f = 1 (valve control)
2 volt-free change-over contacts, 8 A 250 Vac/30 Vdc cos f = 1, (MIN/MAX alarm)
1 analogue output 4-20 mA, max. load 500 ohm (actual value indication)
Provide inductive loads with RC combinations according to manufacturer’s specification to ensure interference suppression
Data line 1 interface for data exchange with operating and display unit BHD50
Indicators and adjustors 1 tri-colour LED indicator (start-up = amber, power ON = green, malfunction = red)
1 code switch with four poles for configuration
Housing Housing material: base: polycarbonate, black; front: polycarbonate, grey
Conductor size: 1 x 4,0 mm² solid per wire or
1 x 2.5 mm² per stranded wire with sleeve to DIN 46228 or
2 x 1.5 mm² per stranded wire with sleeve to DIN 46228 (min. Ø 0.1 mm) terminal strips can be
detached separately
Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety Pollution degree 2 for installation in control cabinet with protection IP 54, completely insulated
Protection Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
Weight approx. 0.5 kg
Ambient temperature when system is switched on: 0° … 55 °C, during operation: –10 … 55°C
Transport temperature –20 … +80 °C (<100 hours), defrosting time of the de-energised equipment before it can be put int operation: 24 hours
Storage temperature –20 … +70 °C, defrosting time of the de-energised equipment before it can be put into operation: 24 hours
Relative humidity max. 95%, no moisture condensation
Supply voltage 24 Vdc +/– 20%
Fuse internal automatic
Power consumption 14.4 W
User interface 5″ color display with capacitive touch screen, resolution 800 x 480 pixels, illuminated
Communication interface RS232, RS422, RS485 and Ethernet 10/100Mb (USB for maintenance only)
Data line For connection to a LCR2652 and BCR3250 (in parallel)
Dimensions Front panel: 147×107 mm
Panel cut-out: 136×96 mm
Depth: 52 + 8 mm
Weight approx. 1.3 kg
Protection Front: IP 66 to EN 60529
Rear: IP 20 to EN 60529
Electrical connection 1 power connector with 3 poles
1 D-SUB connector with 9 poles
2 Ethernet (10/100Mb) RJ45 connector
1 USB Port V2.0, max. 500 mA – for maintenance only
1 Serial connector with 8 poles

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