Issue
Does the DS284IS or D273IS photo smoke detector have a fixed temp heat sensor or rate of rise heat sensor built in?
Solution
The D273IS and the DS284IS are both photo electric smokes with a 135° Fixed temperature heat sensor.
*On both models, the heat sensors are isolated, this means that a heat alarm will provide a separate alarm output through one set of contacts and smoke alarm will provide an alarm output through a second set of alarm output contacts, either smoke or heat alarm will activate the sounder circuit differently. Heat Alarm is a Steady output from the sounder and the Smoke Alarm will produce a Pulsing sounder output.
These detectors also take separate power, which requires a D275 EOL.
Sounder Function
The sounder acts differently depending on what test is preformed.
- When sprayed using canned smoke the sounder pulseson a smoke alarm output trips.
- When tested using a magnet the sounder is steady and trips the isolated heat output.
- When tested using a heat gun the sounder is steady and trips the isolated heat output.
*After the unit is placed in alarm using canned smoke, the sounder and latched LED will clear on its own when the chamber is free of smoke.
10-30 VDC
Standby - 80uA @ 12 volts 100uA max
Alarm - 100mA +or- 10mA @ 30 VDC
Part numbers DS284IS, D273IS
