Product Overview

ManualsBrandsFenwal ManualsHeating SuppliesDetect-A-Fire, Open on Rise (190F)

F-12-0-001

Effective: May 2014

FEATURES

• Repeatable - self-restoring, nothing to replace, testable

• Rugged - withstands shock and vibration

• Versatile - various temperature settings available

• Durable - long lasting stainless steel shell

• Economical - wide spacings reduce installation costs

• Factory set

• Internal contact area hermetically sealed in stainless

steel shell

• ROHS Compliant

APPLICATIONS

• Protection of schools, factories, offices, libraries, etc.

• Power generation

• Gas station islands

• Paint spray booths

• Range hoods

• Engine compartments

DETECT-A-FIRE

Detection and Release Devices

DESCRIPTION

DETECT-A-FIRE

detectors are the “heart” of many fire protection systems. These highly reliable devices have been a standard for

over 65 years. Thousands of these detectors are in use controlling the release of extinguishants such as clean agents, CO

, water,

or dry chemicals. In some systems the device is used as an ALARM device, to sense overheat or fire and alert personnel.

DETECT-A-FIRE detectors have met with wide acceptance because they are designed with RATE COMPENSATION. This provides

a unique advantage over both fixed temperature and rate-of-rise types of detectors because only the DETECT-A-FIRE detector

accurately senses the surrounding air temperature regardless of the fire growth rate. At precisely the pre-determined danger point,

the system is activated.

Fixed temperature detectors must be completely heated to alarm temperature and therefore a disastrous lag in time may occur with

a fast rate fire. Rate-of-rise devices, on the other hand, are triggered by the rate of increase in ambient temperature and are subject

to false alarms caused by harmless, transient thermal gradients such as the rush of warm air from process ovens.

The secret of the unit’s sensitivity is in the design (Figure 1). The outer shell is made of a rapidly expanding alloy which closely follows

changes in surrounding air temperature. The inner struts are made of a slower expanding alloy. Designed to resist thermal energy

absorption and sealed inside the shell, the struts follow temperature changes more slowly.

A slow rate fire (Figure 2) will heat the shell and struts together. At the “set point”, the unit will trigger, actuating the alarm or releasing

the extinguishant.

A transient rush of warm air up to 40°F/min. may expand the shell, but not enough to trigger the unit. By ignoring transient warm air

excursions, the DETECT-A-FIRE detector virtually eliminates false alarms prevalent with rate-of-rise devices.

If a fast rate fire (Figure 3) starts, the shell will expand rapidly. The struts will close, actuating the alarm and/or releasing the agent.

The faster the fire rate of growth, the sooner the DETECT-A-FIRE detector will react.

Figure 1. READY Figure 2. SLOW FIRE Figure 3. FAST FIRE

Summary of content (6 pages)

PAGE 1
DETECT-A-FIRE® Detection and Release Devices FEATURES • Repeatable - self-restoring, nothing to replace, testable • Rugged - withstands shock and vibration • Versatile - various temperature settings available • Durable - long lasting stainless steel shell • Economical - wide spacings reduce installation costs • Factory set • Internal contact area hermetically sealed in stainless steel shell • ROHS Compliant APPLICATIONS • Protection of schools, factories, offices, libraries, etc.
PAGE 2
HORIZONTAL DETECT-A-FIRE DETECTOR SPECIFICATIONS Horizontal DETECT-A-FIRE detectors are designed for locations where appearance is a factor. The attractive, functional design lends physical protection of the unit while making it suitable for commercial, industrial, mercantile public buildings, institutions and marine applications in non-hazardous locations (those classified as “ordinary” under the National Electric Code).
PAGE 3
VERTICAL DETECT-A-FIRE DETECTOR SPECIFICATIONS Vertical DETECT-A-FIRE detectors are designed for use in both “ordinary” or “hazardous” locations. For “ordinary” use, they may be mounted to any approved junction box with 7/8” diameter opening by using 1/2-14 NPT mounting nuts. The device may be wired in or out of conduit, depending on local preferences and codes. To facilitate supervision of system wiring, four lead wires are provided on normally open vertical units (that close on temperature rise).
PAGE 4
MOUNTING CONSTRUCTION DETECT-A-FIRE detectors are not position sensitive. Horizontal and vertical detectors refer to the most common mounting configuration for that unit. However each type can be mounted either horizontally or vertically depending on the application and installation requirements. Stainless steel shell sensing element. Cold rolled steel mounting facility. Off-White finish.
PAGE 5
TABLE 8 DETECT-A-FIRE PART SELECTION GUIDE Model Number Mounting Head Material Contact Operation on Temperature Rise Electrical Rating (Resistive Only) Approximate Weight per Unit 12-X27120-000 12-X27120-022 Brass Type 300 Stainless Steel Opens (450°F Max) 5.0 Amps 125 VAC 0.5 Amps 125 VDC 5 oz. 12-X27121-000 12-X27121-020 Brass Type 300 Stainless Steel Closes 5.0 Amps 125 VAC 0.5 Amps 125 VDC 2.0 Amps 24 VDC 1.0 Amps 48 VDC 5 oz.
PAGE 6
Figure 4. Optional Explosion Proof Enclosure, P/N 06-116317-001 Note: Complies with NEC Class I, Groups A, B, C, D, Class II, Group E,F,G, Class III, and U.L. Standard 886. Explosion Proof Enclosure must be purchased separately from the DETECT-A-FIRE. HOW TO ORDER 1. Select the DETECT-A-FIRE detector model from specifications in Table 1 for horizontal DAF or Table 8 for Vertical DETECTA-FIRE. 2.