The EMS Sentry Monitor programmable control relay measures the output of almost any analog sensor. The 10A control relay has normally open and normally closed contacts, allowing a variety of alarms, pumps, fans, heaters, air conditioning, valves or other devices to be operated when the measured sensor value exceeds the programmed set-point value. Suitable for use as a standalone control, the relay also can act as an analog input channel for a digital PLC.