1800 SYSTEMSENSOR | Alldatasheet
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=, l—. MODEL ‘up he i IONIZATION & iV— y SMOKE DETECTORS FOR ®& rN SYSTEMS APPLICATIONS tk BRK ELECTRONICS First in Fire Warning “ = Ly] a wll ¥ 4 hatin ° Compact, Stylish Design I ¢ Stable Unipolar lonization Sensing Chamber (Ga) ° Designed For Direct Surface or Electrical & yy Box Mounting ¢ Unique Unipolar Dual Chamber Sensor © 10 to 32 VDC Operating Range - Provides Exceptional Stability Convenient Terminal Strip Wiring — 1.5% Nominal Sensitivity * 2 Wire Supervised Circuits — Wind Gusts up to 2500 Feet per Minute * Remote LED Option will not cause False Alarms ¢ Low Standby Ci t ® * Built-in Test Switch Ow standby Curren * Visual Alarm Indication ° Listed to UL 268 ¢ Twist On Mounting Bracket with Tamper Option BRK's 1800 series has been designed to meet the demanding performance DETECTOR RESPONSE TO requirements of UL's new standard 268. Among the most significant dif- SMOLDERING PIRES ferences between this standard and those that it replaces (167) and (168), Unipolar vs. Bipolar is the addition of a slow smoldering fire test. The conventional (bipolar) ye recroR ionization type smoke detector, while extremely responsive to the fastflam- RELECT QR UNIPOLAR ing fires, is sluggish in responding to slow smoldering fires, and therefore to meet UL268, must be set to a more sensitive level than previously re- , UMpgar: Poecoaccenens quired (see fig. 1). tee ee BIPOLAR. BRK’s 1800 series features a new UNIPOLAR sensing chamber, which responds uniformly to the broad range of fire tests required by UL268 (see Bipolar |--~- page 2 for detailed information on unipolar technology). ae Ei Maximum allowable When set to the same sensitivity, the 1800's unipolar chamber is approx- point) Bere eee crest) imately 2 times more sensitive to smoke than conventional bipolar chambers with comparable smoke entry characteristics. Therefore it can be set LESS SENSITIVE than bipolar detectors, and further from the TTS threshold of alarm (1.5% nominal) and still will alarm at the levels of smoke LeveL DEBNORE required by this demanding new standard. In order to pass these new re- (in UL 268 smoldering fire) quirements most competitive units are commonly set below 1% sensitivi- ty, and therefore may be more susceptible to nuisance alarms. Figure 1 The 1800 series are system type products of combustion —_remoted by using BRK’s 669 series remote alarm lamp detectors designed for use with two-wire UL Listed control —_ assemblies. Incorporated within the detector is a sensitivity panels. Drawing less than 100 microamps during normal _test switch which makes troubleshooting easy without operation, the detectors can operate over a broad voltage —_ sophisticated test equipment. Field wiring connects to easy- range of 10 to 32 VDC. The dual chamber unipolar joniza- _to-wire terminals, simplifying installation. Easy to install, tion sensor detects both visible and invisible smoke. The clean and maintain, this detector is designed for direct sur- sensitivity of the 1800 is preset at the factory and does not face mounting (mounting bracket included), or mounting to require adjustment in the field. A solid state voltage regu- a 4" octagon or smaller box. For installation and mainte- ® lator maintains detector sensitivity over a wide range of input nance instructions, see the 156-127-XX Manual and the voltages. A visual indication of an alarm is given by an LED 156-210-XX “Applications Manual for System Detectors" for on the detector cover. The visible alarm signal may be location and placement of the detectors.
’ . . . . BRK’s new unipolar ionization chamber aN Stable response to a broader range of fires! . ai A unipolar dual chamber ionization sensor polar allowing for easier ion recombination. may TH SeAN| } is more sensitive to slow smoldering fires (See figure 3), Tests have shown that uni- ie bcd AHI than a conventional bipolar sensor and yet polar sensors are approximately twice as ~\\ aT li We is less susceptible to nuisance alarms. Like sensitive as bipolar chambers in terms of ) Winn Tit a bipolar sensor, a unipolar sensor is able — chamber signal change to increasing levels Pl HH | IM to detect a change in the chamber ion cur- _ of smoke (see figure 4). Jee) {1 ye Be rent caused by the presence of combustion —_ Furthermore, because its response is not E \\ | dean particles. These particles act as recombina- significantly affected by size or number of F eae ee! tion centers, increase resistance across the smoke particles, the unipolar's response ae ae a chamber and reduce current flow (see figure goes not decrease in a slow smoldering fire \\ Wiest ¥ =p) 2). Unlike a bipolar sensor, a unipolar sensor —_as much as a bipolar detector. Thus, its sen- ———— (see figure 3) accentuates the increase in sitivity does not have to be increased (moved resistance by speeding the rate ofionrecom- closer to the threshold of alarm) to pass bination, The recombination rate is speeded —_ J 268's smoldering fire test. & because the unipolar field, weakens the bi- BIPOLAR UNIPOLAR: ., | CHAMBER RESPONSE VS. SMOKE WITHOUT SMOKE WITH SMOKE ¥ sg UNIPOLAR alpha | ESD SY! region 6 “ 1 f | partion 149 4°} (negative Z r is b oho ip 6 @ | j 1 LOOT} wonsony) | / BIPOLAR 103 9'd 9 9 Lweeeagl” vl al 1 9? 64 vt 4 t yo? " s| / ri e4 19 @ gpl f ‘ Se Netel 2| / = Bipolar | Alpha source 19O%% 9 by si a oe %W/FT. OBSCURATION (Smoke) Fig. 2. Influence of smoke particles on the current in Fig. 4. A Unipolar chamber is approxi- a bipolar ionization chamber. Equal number of + and Fig. 3. Unipolar chamber is larger than bipolar mately twice as responsive as a bipolar = ions. lons recombine on smoke particles and reduce chamber, with one plate positioned beyond the chamber, Thus, It will provide a larger current flow distance traveled by alpha particles. signal swing for a given level of emoke. FLUSH MOUNTING ON Architectural/Engineering specifications EES Sse '4” OCTAGON BOX 4 3 The detectors shall have a dual chamber ionization sensor 14800 Series industrial ionization, dual | o | of the unipolar type. The sensor ehallhave a nominal seni source, dual chamber, unipolar —- | |. tivity of 1.5% ft. as measured in a UL smoke box. It shall be > y possible to performa calibrated sanaitvty and performance ) — Ee test on the detector without the need of generating smoke. “~~ Sheciicavons, 1500 xe = «The test method shal! test all detector clrcults. Control Panel Applications: 2-wire th Me if ans a The detector shall incorporate a solid state voltage regu- Visual LED Local lator which can maintain detection sensitivity over an input Remote LED Annunciator , = voltage range of 10-32 VDC. Standby current shall be no Capability 4 i more than 100 microamps. Current limiting shall protect Operating Voltage Range: —10-32V DC. ba IS the detector against power surges and noise protection ris ODS circuitry shall protect the detector so it can be wired with- Surreneuinite tif >s /6s\\ out conduit, where codes allow. a) Standby (typ.) 100/A@24V {j a) The detector shall have a mounting bracket that allows for b) Alarm Current (typ.) Note 1 Te i} direct surface mounting or mounting to a 4” octagon box. ¢) Alarm Current (max.) Note 1 SOSAY A visual indication of an alarm shall be provided by a latch- ri wi LY ing light emitting diode (LED) on the detector which may arm Signal: Shunt on =, be seen at ground level. The visible alarm signal shall be power lenus ‘aseen sor capable of remote LED annunciation. NOTE Sg pee ; ; 1, Two-wire control panels must limit current to 300mA special test meter shall be available to precisely check et Ui git the calibration and sensitivity of the detector. Metering =) \\ points for the test meter shall be accessible on the exterior (A Mh) of the detector. \\ YN yy | The detector shall not alarm when exposed to wind veloci- \\ sZy/ ties up to 2500 feet per minute. The detector's sensing (Sa chamber shall incorporate less than one microcurie of namic AM241, esr son HOW TO ORDER — 1800 — lonization Detector, 2 Wire, Surface Mount. 156-210-XX — Applications Manual for Systems Detectors. A77-669-00 — Remote Alarm Lamp (LED) Assembly With Rectangular Mounting Plate. TM-80 — Test Meter for Field Check of Voltage and Sensitivity Levels. Distributed by: System Sensor Division
780 McClure Road
Aurora, Illinois 60504-2495 Printed in US.A. 1800 5/85