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Figure 2-8: Detection Chamber Sensitivity and the Alarm
Threshold without Drift Compensation.
Figure 2-9: Detection Chamber Sensitivity and the Alarm Thresh
old with Drift Compensation
Drift Compensation is performed on every detector when the system is pow-
ered up and every 120 hours (based on at least four samples). In addition, a
Drift Compensation is performed on a specific detector whenever a non-
communications Invalid Reply clears.
Corrective Action:
If power has not been removed from the system recently and a Drift Compen-
sation error is present, follow the procedure below:
1) Remove the detector in question.
2) Clean the detector by following the directions supplied with it.
3) Leave the detector out for at least three minutes before replacing it.
4) If the trouble does not clear within a few minutes, remove the detector.
5) Wait for approximately three minutes and replace the detector with a new
one (of the same type) that has been set to the proper address.
If power has been removed from the panel, some detectors may show drift
AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
firealarmresources.com
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