The Discovery Addressable Heat Detector, distinguishable by the low airflow resistant case, uses a single thermistor to sense the air temperature around the detector.
Approvals: AS 7240.5-2004

| Voltage | 17-28 VDC |
| Quiescent Current | 340µA average, 600µA peak |
| Alarm Current | 3.5mA at 24 VDC |
| Operating Temperature | -40°C to +70°C (no icing) |
| Relative Humidity | 0 to 95% (non condensing) |
| IP Rating | IP54 (indoor use) |
| Size (inc Base) | 100mm Dia x 50mm H |
| Weight (inc Base) | 160 grams |
| 4106-2007 | Discovery Heat Detector |