Unlike smoke detectors that detect the presence of smoke particles, heat detectors only react to changes in temperature. The ST-H2-AS is a Thermistor based Heat Detector, which uses electronic components that change their resistance when heated; this change is detected by circuitry within the detector.Thermistor Heat SensorOmniview 360°Direct replacement for ST-H-ASRobust Fully Modulated AS Communications ProtocolEEPROM addressed (Address stored in on-board EEPROM, programmed by handheld programmer)
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