These Fixed Heat Detectors incorporated a self-resetting, be-metallic dish element with respond indicator. They activate whenever the ambient air temperature reaches the top temperature detector setting (various setting available) SPECIFICATION Fixed temperature: 60ºC, 70ºC, 80ºC Alarm Rating: 30 VDC, 50 mA max. Sensitivity: when exposed within an air stream 1m/s, 125% higher than it’s operating temp., and at 20ºC of ambient temperature, approximately 107 seconds for standard and 33.6 seconds for high.