|Subsidiary of Honeywell Life Safety Group|
|Headquarters||St. Charles, Illinois, USA|
President System Sensor HLS
|Products||Fire detection and notification devices|
Number of employees
|Parent||Honeywell International Inc.|
System Sensor is a company headquartered in St. Charles, Illinois, dedicated to the research, development and manufacture of fire protection equipment. System Sensor is a part of the Honeywell Life Safety Group.
System Sensor was founded in 1984  to address the requirements of exclusive industry fire alarm products. In 1997, it introduced its SpectrAlert notification appliance series. In 2006, System Sensor discontinued the SpectrAlert product line, replacing it with the SpectrAlert Advance product line. System Sensor was acquired by Honeywell in the 2000s and currently manufactures fire protection devices, flow switches for fire suppression systems and climate control products. In 2017, the company announced the L-Series, which claims to save energy, installation time, and money.
Mircom is the largest private distribution partner of System Sensor in the world.
- "Companies". Honeywell Life Safety. Archived from the original on 9 November 2015. Retrieved 24 October 2009.
- "About System Sensor". Archived from the original on March 8, 2010. Retrieved 24 October 2009.
- "System Sensor on the web" (PDF). System Sensor. December 12, 1998. Archived from the original (PDF) on 9 July 1997. Retrieved 24 October 2009.