Simplex 4098-9714


Photoelectric Smoke Sensor

Available with Lead Time

Brand: Simplex Part #: 004885 Categories: , , , Manufacturer Part #: 4098-9714 Tags: ,


TrueAlarm photoelectric sensors use a stable, pulsed LED light source and a silicon photodiode receiver to deliver consistent and accurate low power smoke sensing. Three user selectable sensitivities for special applications are available for each individual sensor, 0.2%, 0.5%, and 1% per foot. Standard sensitivity is 1.25% to 3.1% per foot. The fire alarm control panel runs an algorithm that can vary the sensitivity for normal applications between 1.25% and 3.1% per foot.

Note: Fixed sensitivity settings higher than 1.0% per foot are not UL268 7th Edition compliant.

The sensor head design provides 360° smoke entry for optimum response to smoke from any direction. Due to its photoelectric operation, air velocity is not normally a factor, except for impact on area smoke flow.


Weight .50 lbs
Dimensions 5 × 5 × 5 in


Device Addressing

Set via Base

Sensing Element


System Type





  • Sealed against rear air flow entry
  • Interchangeable mounting
  • EMI/RFI shielded electronics
  • Photoelectric technology sensing
  • 360° smoke entry for optimum response
  • Built-in insect screens


TrueAlarm Analog Sensing: TrueAlarm Analog Sensors – Photoelectric and Heat; Standard Bases and Accessories
TrueAlarm Analog Sensing: 4098-9846 Sensor Guard for TrueAlarm Sensors


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