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Discovery Ionization Smoke Sensor

Discovery Ionization Smoke Sensor
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Discovery Ionization Smoke Sensor: VF5600-0M USCG Type Approved 161.002/A53/0 Standard Features - Compatible with Elite and Elite RS-M control panels - 5 operating modes - Drift compensation - Address is set by X-Pert card and is stored in base - User memory - Alarm flag for fast alarm reporting - Conventional false safe mode - Polarity insensitive - Fits 4” & 6” low profile base - 6” audible base - 4” wire relay base The VF5600-0M Discovery Ionization Smoke Detector has a molded white polycarbonate case with wind resistant smoke inlets. Inside the case is a printed circuit board which has the ionization chamber mounted on one side and the signal processing and communications electronics on the other. The ionization chamber consists of a reference chamber contained inside a smoke chamber. The outer smoke chamber has inlet aperatures fitted with insect resistant mesh. Bases and cards are not included with detectors, please order separately. Sectional View - Ionization Smoke Detector 30 Second Alarm Delay Operation The radioactive source holder and the smoke chamber form positive and negative electrodes respectively. An Americium 241 radioactive source mounted within the reference chamber irradiates the air in both chambers, producing positive and negative ions. A voltage across the electrodes produces an electric field. Ions are attracted to the Electrode of the opposite sign to their own charge; many recombine but a small electric current flows between the electrodes. At the junction between reference and smoke chambers, the sensing electrode converts variations in chamber current into voltage hanges. When smoke particles enter the ionization chamber, ions become attached to them with the result that the current flowing through the chamber decreases. This effect is greater in the smoke chamber than in the reference chamber, and the imbalance causes the sensing electrode to become more positive. The analog voltage at the sensor electrode is converted to a digital format which is processed to provide on analog value or transmission to the control panel when the device is polled. Ionization Detector Operating Modes Fireboy-Xintex, Inc. O-379 Lake Michigan Drive Grand Rapids, MI 49534 . 616.735.9380 Fireboy-Xintex, Ltd Unit 10 Holton Road, Holton Industrial Estate Poole, Dorset BH166LT UK . 44 (0) 845 389 9462

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Operation - continued The VF5600-0M Discovery Ionization Detector, like all Ionization detectors, has some sensitivity to air movement (wind). The extent to which the analog value will change depends on the wind speed and on the orientation of the detector relative to the wind direction. Relatively small changes in wind direction can cause significant changes in analog value. For wind speeds up to 200 ft/min the change in analog value will not exceed 5 counts. Continuous operation in wind speeds greater than 400 ft/min is not however recommended. It will not under any conditions increase...

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