The MI-RHSE-S2 uses the same thermistor and microprocessor technology to provide an alarm when the rate of rise in temperature exceeds 10?C/ minute (typical) or if the temperature exceeds a threshold of 58?C (Response Class A1R).
With the implementation of the Advanced Protocol, any model can be software configured to be either a fixed 58?, a fixed 78? unit or a 58? with rate of rise device.