The controllers are housed in a small custom IP66 surface mounted enclosure with a 3 1/2 digit liquid crystal display.
The BC9 provides a single pole change over relay to operate a solenoid valve or dosing pump and theBC92 & 93 provide an isolated 0/4-20 mA output for remote monitoring or recording.
For cooling tower bleed applications the BC92 provides an additional relay output to control an inhibitor feed pump. The time that this relay is energised is in proportion to the bleed relay on time. This provides a cost effective method of proportional inhibitor dosing without the need for a water meter.
The BC93 has 2 single pole changeover relays as well as an isolated 0/4–20mA output.