TDS Controller for steam generators (Automatic purge of dissolved solids) BCS-211

DESCRIPTION

The ADCATROL BCS-211 controller is part of the dissolved solids (TDS) control system used in steam boilers. This system is composed by a SPS series conductivity probe, a BCS-211 controller, a VPC series blowdown valve and, in case of need, a UC-820 universal process controller for PID control.

The BCS-211 controller continuously measures, at the electrode rod in the measuring cell, the electrical conductivity of the boilers’ water, which is closely related to the level of TDS. The value measured is then compared with the set point of the controller. If that value exceeds the set point, the controller opens the blowdown valve using its relay (on/off) output (lighting up the “Alarm” indicator lamp).

If the measured value drops below 78% of the set point, the controller relay is energized, closing the blowdown valve (the “Alarm” indicator lamp turns off).

A modulating (PID) control may be achieved by using the BCS-211 4-20 mA transmitter output in conjunction with a UC-820 universal process controller

MAIN FEATURES

Compatible with both SPS-21 and SPS-33 series conductivity probes.

Relay (on/off) output and 4-20 mA transmitter output.

Standard 35 mm rail fixation according to DIN EN 50022 or directly screwed to chassis plate.

Allows quick performance tests by pressing and holding the “TEST K” button