Omega CN2081 and CN2091 Series are microprocessor-based instruments with special design features for extra safety and reliability. These devices provide one 5 ampere electromechanical relay (EMR) to alarm or shut down the system when the temperature exceeds the setpoint. The analog backup looks at the input signal independently from the main microprocessor circuitry, compares the input to its own setpoint and will trip the limit relay at alarm state if the digital circuit fails to do so.