Appendix D: Intelligent Sensing Applications; D.1: Intelligent Sensing Overview; D.2: Intelligent Sensing Features; D.2.1: Drift Compensation And Smoothing - Honeywell NOTIFIER NFS2-3030 Programming Manual

Appendix D: Intelligent Sensing Applications

D.1 Intelligent Sensing Overview
Intelligent Sensing is a set of software algorithms that provide the NFS2-3030 with industry-
leading smoke detection capability. The user can program Intelligent Sensing functions on a global
or on a per-detector basis.
Intelligent Sensing topics covered in this appendix:
Topic
Intelligent Sensing features – Descriptions of Intelligent Sensing features, such as
Drift Compensation, Sensitivity Adjust, programmable on a per-detector basis.
Pre-Alarm – Alert and Action settings, programming (global settings).
Detector Sensitivity Settings – Pre-Alarm and Alarm sensitivity settings for photo,
ion, laser, and multisensor detectors programmable on a per-detector basis.
Detector Maintenance Features – Instructions for viewing and printing detector
maintenance information.
D.2 Intelligent Sensing Features
Intelligent Sensing features include the following:
• Drift Compensation and Smoothing
• Maintenance Warnings - Three Levels
• Self-optimizing Pre-Alarm
• Detector Sensitivity
• Cooperative Multi-Detector Sensing
D.2.1 Drift Compensation and Smoothing
Drift compensation uses algorithms (U.S. patent pending) that identify and compensate for long-
term changes in the analog readings from each smoke detector. (Typically, dirt and dust
accumulation inside the smoke chamber causes long-term changes in detector readings.) Drift
compensation does the following:
• Allows a detector to retain its original ability to detect actual smoke, and resist false alarms,
even as dirt and dust accumulates.
• Reduces maintenance requirements by allowing the control panel to automatically perform
the periodic sensitivity measurements required by NFPA Standard 72.
The software also provides smoothing filters to remove transient noise signals, usually caused by
electrical interference. Different smoothing algorithms are used, depending on the sensitivity
selection of each detector. Refer to Appendix D.4, "Detector Sensitivity Settings", on page 113 for
more information on detector sensitivity levels.
NFS2-3030 Programming Manual — P/N 52545:A 11/29/2005
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