Siemens OH121


Detector Combo PE/Heat Conv

Availability: Estimated 6 - 8 Business Days

  • Factory New
Brand: Siemens Part #: 72156 Categories: , , Manufacturer Part #: OH121


Model OH121 from Siemens Industry ─ Fire Safety is a photo / thermal smoke detector that contains a thermal sensor. When the sensor is utilized, an Alarm condition will trigger when the temperature reaches 135°F ─ at this point, the detector will also lock into Alarm condition. The magnet-test feature allows for Model OH121 to be tested without the use of a heat gun, providing quick testing for installers and test personnel to prove the integrity of the wiring and proper connection to the fire alarm control panel (FACP).





  • State-of-the-art, smoke-detection chamber that yields quick response
  • Incorporates one (1) state-of-the-art chamber for rapid, uniform response to alarm criteria (i.e. ─ heat, smoke)
  • Magnet-test feature
  • Automatic sensitivity test without the need for a special tester (per NFPA 72)
  • Available optional sounder base, providing an alert and evacuation signal
  • UL 268 Listed, ULC S529 Listed; FM, CSFM Approved

Photo Thermal Smoke Detector; Model OH121


Siemens – Data Sheet