Data Sheet for Product

Explosion-Proof Thermal Fire Detectors 6128
s Industry, Inc.
Building Technologies Division
s
Data Sheet
Fire Safety & Security Products
Conventional Detection Devices
Thermal Fire Detectors
Explosion-Proof Devices
ARCHITECT AND ENGINEER SPECIFICATIONS
For Detect-A-Fire Models
 Explosion proof
− Models available in Normally Open (N.O) and Normally Closed (N.C) contacts in a wide
range of temperature settings
 Self restoring detector element
 Factory set and hermetically sealed in a stainless-steel shell
 UL / ULC Listed, FM Approved [as Fenwal Model Series 27120 and 27121];
− Manufactured for Siemens ─ Fire Safety by Fenwal Protection Systems
Product Overview
Detect-A-Fire explosion-proof detectors, which are rate
compensated, are designed for use with Siemens
─ Fire
Safety detection devices. Moreover, the detector element in
each device is self-restoring after operation.
Each Detect-A-Fire, explosion-proof detector can be
supplied with (N.C) contacts at 140°F (60°C); 160°F
(71.1°C); 190°F (87.8°C); 225°F (107.2°C); 275°F (135°C);
325°F (163°C); 360°F (182.2°C), or 450°F (232°C) settings.
Each Detect-A-Fire, explosion-proof detector can also be
supplied with (N.O) contacts at 140°F (60°C); 160°F
(71.1°C); 190°F (87.8°C); 275°F (135°C); 325°F (163°C);
360°F (182.2°C); 450°F (232°C); 600°F (316°C), or 725°F
(385°C) settings.
Note: Each detector is only explosion proof when mounted in an
agency-approved / listed explosion-proof junction box.
Operation
Detect-A-Fire detectors are widely industry-accepted since
each is designed with (temperature) rate compensation.
This product feature provides a distinctive advantage over
both standard, fixed temperature and rate-of-rise types of
detectors: 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 immediately activated.
The secret of the Detect-A-Fire’s sensitivity lies within its
design. For instance, 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 lower-expanding alloy.
Designed to resist thermal-energy absorption and sealed
inside the shell, the struts will thus follow temperature
changes more slowly.
A slower-rate fire will heat the shell and struts together. At
the ‘set point’, each device will trigger, actuating the alarm
or releasing the extinguishant.
A transient rush of warm air up to 40°F/ (4.4°C) min. may
expand the shell, but any expansion will not be enough to
trigger the device. In ignoring transient warm-air
excursions, the Detect-A-Fire device virtually eliminates
false alarms common with rate-of-rise devices.
If a fast-rate fire ignites, the shell will then expand rapidly,
and the struts will close, thus actuating the alarm or
releasing the agent: the faster the fire’s rate-of-growth, the
sooner the alarm will trigger.
Ratings
Fenwal
Model
Contacts
Electrical Rating
{Resistive Only}
5.0 Amps, 125VAC
27120 Series Normally Closed
0.5 Amp, 125VDC
5.0 Amps, 125VAC
0.5 Amp, 125VDC
2.0 Amps, 24VDC
27121 Series Normally Open
1.0 Amp, 48VDC