A control unit is microprocessor-based and has both control and verification functions. It is comprised of control and battery charging circuits, a power supply and front panel which includes control and indication functions visible through a scratch-resistant window. The unit is packaged in an enclosure which is designed to provide superior dust contamination and weather resistance. Terminal access has been carefully designed for ease of installation.
Any signals emerging from the explosion pressure or flame sensors are recorded, tested and evaluated by the control unit. The monitoring and activation lines are continuously checked for wire breakage, earth fault and short circuit. Additionally, an automatic self-test system ensures that all important functions of the control unit are verified electronically. These control units provide both trouble relay contacts for process interlocking, and alarm relay contacts for notification should a system actuation occur.