Fst-851 Thermal Detector

DN-6936:A • H-211

FST-851 Series
Intelligent Thermal (Heat) Detectors with FlashScan®
Intelligent/Addressable Devices

General
Notifier FST-851 Series intelligent plug-in smoke detectors with integral communication provide features that surpass conventional detectors. Detector sensitivity can be programmed in the control panel software. Sensitivity is continuously monitored and reportedto the panel. Point ID capability allows each detector’s address to be set with decade address switches, providing exact detector locations for selective maintenance when chamber contamination reaches an unacceptable level. FST-851 Series thermal detectors use an innovative thermistor sensing circuit to produce 135°F/57°C fixed-temperature (FST851) and rate-of-rise thermal detection (FST-851R) ina lowprofile package. FST-851H provides fixed high-temperature detection at 190°F/88°C. These thermal detectors provide cost effective, intelligent property protection in a variety of applications. FST-851 Series detectors are compatible with all Notifier intelligent Fire Alarm Control Panels (FACPs). FlashScan® (U.S. Patent 5,539,389) is a communication protocol developed by NotifierEngineering that greatly enhances the speed of communication between analog intelligent devices and certain NOTIFIER systems. Intelligent devices communicate in a grouped fashion. If one of the devices within the group has new information, the panel’s CPU stops the group poll and concentrates on single points. The net effect is response speed greater than five times that of earlier designs.

6936pho1.jpgFST-851 Series in B710LP base
• Plugs into separate base for ease of installation and maintenance. Separate base allows interchange of photoelectric, ionization and thermal sensors. • SEMS screws for wiring of the separate base. • Constructed of off-white Bayblend®, designed to commercial standards, and offers an attractive appearance. • 94-5V plastic flammability rating. • Remote LED outputconnection to optional RA400Z remote LED annunciator. • Optional sounder, relay, and isolator bases. • Optional recessed (RMK400) or surface (SMK400) base mounting kits.

Features
• • • • • • Sleek, low-profile, stylish design. State-of-the-art thermistor technology for fast response. Rate-of-rise model (FST-851R), 15°F (8.3°C) per minute. Factory preset at 135°F (57°C); high-temperaturemodel at 190°F (88°C). Addressable by device. FlashScan® (NFS-640, NFS-3030) and classic CLIP system (AFP-100, AFP-200, AFP-300, AFP-400, NFS-640, AFP1010, AM2020, NFS-3030, NFS2-3030) compatible. Rotary, decimal addressing (1 – 99 on current classic systems, 1 – 159 on FlashScan® systems). Two-wire SLC connection. Visible LEDs “blink” every time the unit is addressed. 360°-field viewing angle of thevisual alarm indicators (two bi-color LEDs). LEDs blink green in Normal condition and turn on steady red in Alarm. Integral communications and built-in device-type identification. Remote test feature from the panel. Built-in functional test switch activated by external magnet. Walk test with address display (an address of 121 will blink the detector LED 12-(pause)-1). Low standby current. Listedto UL 521. Backward-compatible. Built-in tamper-resistant feature. Designed for direct-surface or electrical-box mounting. Sealed against back pressure.

Specifications
Size: 2.1" (5.3 cm) high x 4.1" (10.4 cm) diameter installed in B501 base, 6.1" (15.5 cm) diameter installed in B710LP base. Shipping weight: 4.8 oz. (137 g). Operating temperature range: FST-851 Series, FST-851R: – 20°C to38°C (–4°F to 100°F); FST-851H: –20°C to 66°C (–4°F to 150°F). Detector spacing: UL approved for 50 ft. (15.24 m) center to center. FM approved for 25 x 25 ft. (7.62 x 7.62 m) spacing. Relative humidity: 10% – 93% noncondensing. Thermal ratings: fixed-temperature setpoint 135°F (57°C), rate-of-rise detection 15°F (8.3°C) per minute, high temperature heat 190°F (88°C).

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