Boiler house

TDS blowdown controls

2.4.21

BC3150

x1000

x100

x10

LCD display

5 button display

Clamping screw

Clamping screw

Function

All ranges and operating parameters are selected using the software menu.

Commissioning is carried out using the two lower buttons.

Once fully commissioned, the TDS value is displayed in μS/cm (or ppm if selected).

CLN

AL

OK

If the water conductivity exceeds the Set Point level, the TDS value shown on the display will alternate with 'bld', and the valve relay will

be energised until the conductivity drops below 5% of full scale (FS) below the set point.

If the water conductivity exceeds the alarm level, the TDS value will alternate with 'AL' , and the valve relay will be energised until the

conductivity drops 3% (FS) below the alarm level.

If the system is carrying out a purge, The TDS value will alternate with 'Pur', and the valve relay will be energised until the conductivity

drops 5% (FS) below the set point.

Inputs

The BC3150 can accept a signal from a Spirax Sarco conductivity probe (CP10, CP30, or CP32).

A Pt100 temperature sensor may be connected to provide temperature compensation (2% / °C). 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.

If a Pt100 is not fitted, the product uses a default temperature of 184°C (10 bar g).

Outputs

Pulsed output - For smaller boilers where the capacity of the blowdown valve is relatively high compared to the boiler size, the blowdown

may be set to pulsed, rather than continuous output, opening for 10 seconds, and closing for 20 seconds. This slows the rate at which the

boiler water is removed so that the level is not unduly affected, avoiding the risk of triggering a low water alarm.

Other features

To prevent unwanted or inadvertent changes being made, all commissioning parameters are protected with a pass code.

The BC3150 can communicate via an infrared link between adjacent controllers.

This feature enables the parameters of this product (OEM) to be passed to a product fitted with RS485 (user).

The BC3150 is always an IR slave – No set-up or adjustment is needed.

An isolated 4 - 20 mA output is provided as standard, and may be used for remote display of the TDS level or as an output to a computerised

management system.

Page 2 of 5

TI-P403-91 AB Issue 6

BC3150 Blowdown Controller