ATJ-EA – Fixed Temp-Rate of Rise Heat Sensor-Asian-technologies-ltd
STANDARD FEATURES
Low profile – only 2.00″ high, including base
Simple and reliable device addressing method
Uses the noise immune Digital Communication
Protocol (DCP), which utilizes interrupts for fast
response to fires
Rate of rise temperature threshold = 15°F/Min
(determined by panel)
Adjustable threshold temperature = 135°F – 190°F
(determined by panel)
UL maximum spacing of 70 feet
SPECIFICATIONS
Operating Voltage 24 – 41 VDC
Standby Current 350µA
Alarm Current 500µA
Transmission Method DCP – Digital Communication
Protocol
Rate of Rise 15° F/Min. (8.3° C/Min.)
UL Temperature Range 135° F to 190° F
(57.2° C to 87.8° C)
Operating Temperature Range 14° F to 122° F
(-10° C to 50° C)
UL Maximum Spacing 70 feet
Maximum Humidity 95% RH Non-Condensing
Color & Case Material Bone – ABS blend
Weight 3.2oz (4.9oz. with 4” base)
Bases YBN-NSA-4, HSB-NSA-6,
ASB, SCI-B4, SCI-B6, ASBL
APPLICATION
The Hochiki ATJ-EA Fixed Temperature / Rate of Rise
sensors provide accurate temperature measurement
data to the fire alarm control panel. These sensors are
well-suited for environments where dust, cooking fumes
or other factors make the use of smoke sensors
impractical.
OPERATION
The ATJ-EA incorporates a highly linear thermistor
circuit. The specially designed cover protects the thermistor while allowing maximum air flow. The thermistor
circuit produces a voltage proportional to the temperature. This information is transmitted to the control panel
as a digital value. When the ambient temperature
exceeds a pre-programmed threshold (fixed temp or
rate of rise), the sensor transmits an interrupt to the
control panel indicating a fire alarm. The fire alarm
control panel can adjust the sensor’s fixed temperature
threshold for different installation requirements.
Up to 127 devices may be installed on each SLC loop.
The sensor address may be set by a hand-held
programming unit. The sensor mounts to an electronics
-free base and incorporates a locking mechanism for
security. The base provides mounting slots, terminals
for field wiring and a third terminal for a remote indicator/LED. The sensor has dual LEDs for easy viewing of
the sensor status.
SENSOR SPACING
Heat sensor spacing shall be in compliance with NFPA
72. The distance between heat sensors shall not
exceed their listed spacing or all points on the ceiling
shall have a sensor within a distance equal to or less
than 0.7 times the listed spacing. Heat sensors shall be
located within a distance of one-half the listed spacing,
measured at right angles from all walls or partitions
extending upward to within the top 15 percent of the
ceiling height. For additional instructions see NFPA 72.
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