The 52051E and 52051HTE are fixed temperature analogue addressable sensors employing low mass thermistors and microprocessor technology for fast response and linear temperature sensing. Their linear response allows these sensors to be used to signal temperatures over the range of 58 degrees (class A1S) to 78 degrees (Class BS).
 
The 52051RE uses the same thermistor and microprocessor technology to provide an alarm when the rate of rise in temperature exceeds 10 degree/minute (typical) or if the temperature exceeds a threshold of 58 degrees. With the implementation of the Series 200 Advanced Protocol, any model can be sof