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FEATURES

• UL Listed, S6082, UROX Adjustable Sensitivity Dual Chamber Sensitivity Test Points Simple Twist/Lock Assembly Optional Auxiliary Relay Screw-Clamp Terminals Alarm LED CSFM Approved, #7271-0065:136
• Crafted in the U.S.A.

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DESCRIPTION
The Faraday 8900 Series detector is a plug-in, ionization detector and is designed for two wire system operation. The 8900 is designed with adjustable sensitivity while the 8902 and the 8904 have a fixed sensitivity designed for their individual high air flow applications. The 8900, 8902 and 8904 consist of self-compensating, dual ionization chambers and a highly stable, solid state amplifier-switching circuit. One chamber detects the presence of combustion products, the second chamber serves as a reference, to stabilize the detector's sensitivity for changes in environmental conditions. As products of combustion enter the sampling changer, the chamber current is reduced producing a voltage change. At the time, the voltage range exceed the pre-determined threshold, an alarm is signaled to the control unit. The detector locks in upon alarm and must be reset from the control panel. The sensitivity of the 8900, 8902 and 8904 is present at the factory. The electrical sensitivity can be monitored in the field using the Faraday sensitivity tester,module 8915. The sensitivity test jack on the 8900, 8902 and 8904 and the adjustment screw on the 8900 are accessible from the front of the detector housing enabling the user to perform all sensitivity adjustments and tests without removing the detector from its base. The detectors utilize a low profile surface mounting base, model 8914, which may be attached to either a 4? octagonal, single gang outlet box, 4 11/18? square wiring box. The 8914 base utilizes screw-clamp terminals for all electrical connections, self-wiping contacts for reliability and contain provision for an optional concealed locking mechanism to prevent unauthorized removal of the detector head. The Faraday 8900 Series ionization detector has been designed to meet a wide range of system design parameters. The 8900 detector is designed for open area protection in areas with air velocities up to 300 feet per minute. The Faraday 8902 is recommended for use in high air velocity application such as computer room under floor areas. The model 8902 contains a specially designed internal chamber cover and a pre-selected fixed sensitivity setting which provides extremely stable operation. Model 8902 has been UL listed for operation in air velocities of 0 to 1200 feet per minute. Since air velocity has an effect on detector sensitivity and performance, the 8902 should be used only in applications which meet this established air velocity range.

The 8904 is designed specifically for use with the Faraday 8930 air duct housings and, like the 8902, contains a specially designed internal chamber cover and a pre-selected fixed sensitivity setting. The 8904 must be utilized with the 8930 air duct housing in air duct applications with velocities of 500-4000 FPM. The 8900, 8902 and 8904 are also available for high altitude applications (3000 to 8000 feet above sea level) as model numbers 8901 8903 and 8905. The 8900 and 8902 are capable of operating a remote alarm lamp, model 8922/8923.

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APPLICATION DATA
The Faraday Ion detectors are applicable to the 30 foot center spacing (900 sq. ft.) as referred to in NFPA 72. This spacing, however, is based on ideal condi-tions namely smooth ceiling, no air movement, and no physical obstructions between the fire source and the detector. This spacing should be used as a guide or starting point in detector installation layout. Do not mount detectors in areas close to ventilating or air conditioning outlets. Exposed joists or beamed ceilings may also affect safe spacing limitations for detectors. It is mandatory that engineering judgment be applied regarding detector location and spacing.

The 8900-8905 ionization detectors are Underwriter Laboratories, Inc. listed.

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TECHNICAL SPECIFICATIONS
Current Requirements

• Normal – 100 ma Max.
• Alarm – 80 ma. Max.

Voltage Range

• 21 ± 3 VDC

Operation Temperature

• + 32°F (0°C) to 100°F (38°C) per UL

Humidity

• 0-93% relative humidity, non-condensing

Air Velocity

• 0-300 ft./min. Model 8900 0-1200 ft./min. Model 8902
• 500-4000 ft./min. Model 8904
  (requires air duct housing)

Shipping Weight

• 1 Lb. (.45 Kg.)

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MOUNTING DATA & DIMENSIONS

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TYPICAL WIRING

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