Simplex 4098-9784

Standard Sensor Base 4″

  • Factory New
  • Material Obsolete
Brand: Simplex Part #: 53995 Categories: , Manufacturer Part #: 4098-9784 Tag:


TrueAlarm sensor bases contain integral addressable electronics that constantly monitor the status of the detachable photoelectric, ionization, or heat sensors. Each sensor’s output is digitized and transmitted to the system fire alarm control panel every four seconds.

Since TrueAlarm sensors use the same base, different sensor types can be easily interchanged to meet specific location requirements. This feature allows intentional sensor substitution during building construction. When conditions are temporarily dusty, instead of covering the smoke sensors, heat sensors may be installed without reprogramming the control panel. Although the control panel will indicate an incorrect sensor type, the heat sensor will operate at a default sensitivity and provide building protection.


Weight 0.2 lbs



DIP Switch, Set via Base

Production Status




Product Notes

Replacement: Simplex 4098-9792


  • Base mounted address selection remains with location and is accessible from front (dip-switch under sensor)
  • Automatic identification provides default sensitivity when substituting sensor types
  • Integral LED for power-on (pulsing), or alarm or trouble (steady-on)
  • Locking anti-tamper design
  • Magnetically operated functional test
  • Mounts on standard outlet boxes


TrueAlarm Fire Alarm Systems; Communicating Devices
Simplex – Data Sheet
Addressable Peripherals; IDNET and MAPNET II Addressable Devices
Simplex – Compatibility Chart