Det-Tronics U7099 Dual Frequency IR Detector/Controller - Manual (Page 2)

INSTRUCTIONS
Dual Frequency Infrared
Detector/Controller
U7099
APPLICATION
The Det-Tronics U7099 Unitized Dual Frequency
Infrared (IR) Detector/Controller features two sensors,
each looking at different wavelengths in the infrared
spectrum. The signals from the sensors are used to
detect particular spectral characteristics of burning
hydrocarbon fires, and are processed so that false
alarms from “blackbody” sources are reduced. Since
electric arcs do not emit significant radiation at the
response frequencies of the U7099, false actuations
from arc welding will not occur. Thus the U7099
responds primarily to a true fire condition. Its perfor-
mance is relatively unaffected by smoke, and contami-
nation of optical surfaces by such things as oil and
grease has only moderate effect.
The standard U7099 Dual Frequency Infrared
Detector/Controller has a Fire and a Fault relay. A
model that includes an additional Auxiliary Fire relay is
available to provide expanded output options.
Typical applications for the Det-Tronics IR fire detection
system are:
— aircraft maintenance hangars
— ship engine compartments
— hazardous locations where smoke can be expected
to precede a fire
— hazardous locations where arc welding is conducted
— automobile paint spray booths
— turbine enclosures.
FEATURES
• Quick response to hydrocarbon fires - typical reaction
time to a one square foot gasoline pan fire at 25 feet
(7.5 meters) is less than 5 seconds.
• Not adversely affected by arc welding, strobe lights,
lightning flashes, flashbulbs or radioactive sources (x-
rays).
• Adjustable mounting swivel for ease of installation and
positioning.
• Factory Mutual (FM) approved and Canadian
Standards Association (CSA) certified.
SPECIFICATIONS
INPUT VOLTAGE—
20 to 32 vdc with a maximum ripple of 5 volts peak to
peak.
ENCLOSURE MATERIALS—
Anodized copper-free aluminum.
ENCLOSURE RATINGS—
Explosion-proof housing designed for indoor use. FM
approved and CSA certified for Class I, Groups C and
D; Class II, Groups E, F and G. CSFM listed.
SENSITIVITY—
The IR sensing elements are adjusted for response to a
one square foot gasoline pan fire at a distance of 25
feet (7.5 meters) on the primary axis in less than 5 sec-
onds. Figure 1 gives response of the detector to fire at
varying distances. Figure 2 is a diagram of the cone of
vision.
POWER CONSUMPTION—
1.5 watts, typical, 2.5 watts, maximum.
TEMPERATURE RATING—
Operating: –13°F to +185°F (–25°C to +85°C).
Storage:
–67°F to +185°F (–55°C to +85°C).
DIMENSIONS—
See Figure 3.
RELAY CONTACT RATING (Maximum)—
Resistive: 2 amperes at 28 vdc, 0.1 ampere at 115 vac.
Inductive: 0.5 ampere at 28 vdc.
©
Detector Electronics Corporation 1995 9/95 95-8272-02