Description
The DP991 Apollo Discovery Optical Detector is an elegant, slim-line, optical sensor with high performance analogue addressable features. Compensation for sensor drift is included as part of the internal signal-processing algorithm.
Optical Smoke Monitor
The DP991 Apollo Discovery Optical Detector has an internal pulsing LED and a photodiode at an obtuse angle. In clear air conditions the photo-diode in the monitor receives no light from the LED and produces a corresponding analogue signal. This signal increases when smoke enters the chamber and light is scattered onto the photodiode.
The signal is processed by the electronic circuitry and transmitted to the control equipment in exactly the same way as in the case of the ionization smoke monitor.
Drift Compensation
The drift compensation algorithm will compensate for changes in sensor output caused, for example, by dust in the chamber, and will therefore hold the sensitivity at a constant level even with severe chamber contamination. This increased stability is achieved without significantly affecting the detector’s sensitivity to fire.
Compensation values are stored in nonvolatile memory and will be retained even if detectors are disconnected.
Unique Addressing
A unique, patented addressing method provides simple, user-friendly and accurate identification of monitor location whereby a coded card, inserted in the base, is read by any monitor as it is plugged in. All the electronic components are in the monitor, but the location information is held in the base.
Addressing errors during maintenance and service are eliminated. Pre-coded and pre-numbered address cards are also available. These address cards simplify and speed up installation and commissioning.
5 Approved response modes for ease of optimization to different environments
Rejection of transient signals
Drift compensation to ensure constant sensitivity
360° Alarm visibility
Flashing LED option
Fast alarm reporting
EN54 approved and CPR certified |
