D273 Photoelectric Smoke and Smoke and Heat Detectors
- 12 VDC or 24 VDC input
- Designed for commercial or residential use
- Four-wire application
- Light-emitting diodes (LEDs) indicate the status of the chamber, power, and alarm
- Removable terminal block to simplify wiring connections
- Cable connection point for voltmeter sensitivity test
- Trim Plate TP280 for retrofit and remodeling purposes
These detector models use an infrared (IR) LED light source and a silicon photodiode to measure light in a chamber. A fine screen covers the chamber to deter insects and reduce dust accumulation and nuisance alarms. During a fire, smoke particles reflect light onto the photodiode. When the photodiode measurements exceed the alarm threshold, the detector signals an alarm condition. After the alarm condition clears, interrupt power at the control panel to reset the detector.
| Relative Humidity: | Up to 93%, non-condensing |
| Operating and StorageTemperature: | +32°F to +120°F (0°C to +40°C) |
| Radio FrequencyInterference (RFI)Immunity | No alarm or setup on critical frequencies in the range of 26 MHz to 950 MHz. |
| Dimensions (Diameter x H): | 5 in. x 2 in. (12.7 cm x 5.1 cm) |
| Material: | High impact, fire retardant ABS plastic |
| Power-up Time: | 22 sec maximum |
| RMS Ripple: | 25% of DC input maximum |
| Voltage (stand-by): | 10 VDC to 30 VDC |
| Current Draw (alarm) at 30 VDC | |
| D273, D273TH: | 18 mA maximum |
| D273THC: | 33 mA maximum |
| D273THE, D273THR: | 36 mA maximum |
| D273THS: | 78 mA maximum |
| D273THCS: | 90 mA maximum |
| D273THES: | 96 mA maximum |
| D273IS: | 100 mA maximum |
| Current Draw (standby) | |
| D273, D273TH, D27THC, D273THCS, D273THS: | 0.1 mA maximum |
| D273IS: | 15 mA |
| D273THE, D273THES: | 15 mA |
| D273THR: | 18 mA maximum |