INSTRUCTIONS
Risk Area Heat Detector with
Explosion-Proof Junction Box
Model HD
7.1 ©2020 Detector Electronics Corporation 95-8666
Last Manual Update: 6/24/19
DESCRIPTION
The Model HD Risk Area Heat Detector accurately
senses the surrounding air temperature and actuates
an electrical contact output at a pre-determined
temperature. The expansion coefficients of the metal
alloys used in the construction of the detector enable
the hermetically sealed contact to activate at a precise
point.
The Model HD Detector can be used as an alarm device
to sense excessive heat or fire and warn personnel, or
it can be used as a signaling device to sense fire and
send a signal to an alarm panel for actuation of a fire
suppression system.
The design of the heat detector utilizes Rate
Compensation, which provides enhanced performance
when compared to fixed-temperature or rate-of-rise
detectors. Rate-of-rise devices rely on a rapid rate
of increase in the ambient temperature to actuate
an output and are subject to false alarms caused by
warm thermal currents resulting from various industrial
processes. Fixed temperature detectors must be
completely heated to the alarm setpoint in order to
activate and can require a longer than desired response
time in the event of a rapidly growing fire. The Model HD
Detector senses the surrounding air temperature and
actuates its output when the temperature reaches the
pre-determined level, regardless of the fire growth rate.
The unique properties of the alloy outer shell allow the
Model HD to respond more quickly as the fire growth
rate increases; i.e., the faster the fire grows, the sooner
the unit will react.
The heat detector and integral explosion-proof junction
box have been properly evaluated and certified for
high temperature exposure conditions. The detector’s
electrical contact is factory wired to a screw terminal
block located within the junction box. All external wiring
to the device is also connected to this screw terminal
block. The junction box material type is available in
aluminum or stainless steel, with two or four conduit
entries, and either 3/4 inch NPT or 25 mm threads.
The Model HD is ideally suited for use in hazardous
(classified) locations.
FEATURES
• Repeatable - resets itself, nothing to replace, testable
• Rugged - withstands shock and vibration
• Versatile - various temperature settings available
• Economical - wide spacings reduce installation costs
• Factory set internal contact area is hermetically
sealed in stainless steel
• Ease of wiring and installation
• Aluminum or stainless steel junction box, stainless
steel heat detector
•
Models approved and certified to FM, CSA, ATEX,
IECEx, and INMETRO Hazardous Location standards
•
Models certified by Exida for SIL 2 Safety Instrumented
System applications
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