For models 400, 800, 4100: -20° to 150°F For Express, Express II and ISACC, 2000: -60° to 175°F Only one sensor may be wired per input.
Indoor 2.8K Temperature Sensor - Description
FGD-0100 Remote Temperature Sensor For use with all Sensaphone Dialers. Enables you to monitor temperature at a location away from your Sensaphone® unit. Measures and tells you the exact temperature and triggers an alarm when conditions exceed the set high/low limits. May be mounted anywhere air temperature needs to be measured and can be used with all Sensaphone® models. Only one sensor may be wired per input. Dimensions: 2.5" x .75" x .75"