Smoke Sensor Calibration Error

[Sandeep_Kumar006]

1. Issue

Panel showing detector Calibration error.

Product Line

ESMI Fire Detection.

Environment

• FFSULH1001.
• FFSULH1002.

Cause

When the contamination increases significantly and exceeds the sensitivity range for the smoke sensor, it is no longer able to perform calibration, causing a calibration error.

Resolution

1. Understanding the Calibration Process:
   • The Esmi Ultima panel performs daily calibration and drift compensation for all addressable smoke sensors at 7 AM by default.
2. Sensitivity and Contamination:
   • Over time, dust and other contaminants can build up in the chamber of a smoke sensor, increasing its sensitivity.
   • Illustration:
     • Left Image: Clean sensor requiring 2.0% per foot of smoke to activate the fire alarm.
       Right Image: Contaminated sensor with increased sensitivity, requiring less smoke to reach the alarm threshold of 2.0% per foot.
   

3. Trouble Condition:

   • When the panel can no longer compensate for the contamination, it indicates a trouble condition.

   • The Esmi Ultima panels can compensate for contamination build-up in addressable smoke detectors and addressable multi-criteria detectors.

   • Daily calibration offsets any contamination, ensuring each smoke detector remains within its UL Listed sensitivity range.

4. Recommended Action:

   • Clean or replace the sensor with a new one of the same model. If you have a replacement in stock, replace it immediately.