HOCHIKI ATJ-EA Fixed Temp-Rate Of Rise Heat Sensor Instruction Manual
- June 4, 2024
- HOCHIKI
Table of Contents
ATJ-EA Fixed Temp-Rate Of rising
Heat Sensor Instruction Manual
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 rising 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, AS
APPLICATION
The Hochiki ATJ-EA Fixed Temperature / Rate of Rising 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 rising),
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
the 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.
ENGINEERING SPECIFICATIONS
Heat sensors are installed in accordance with NFPA 72, the UL Listed spacing
requirements, and the rules and regulations set forth by the local authorities
having jurisdiction. The contractor shall furnish and install, where indicated
on the plans, fixed temp/rate of rising automatic heat sensors. The heat
sensor head and twist lock base need to be UL Listed as compatible with a UL
Listed fire alarm control panel. The base permits direct interchange with the
Hochiki
AIE-EA ionization type smoke sensor, ALG-V, ALK-V/ALK-V2 photoelectric type
smoke sensors, ATG-EA, ATJ-EA heat sensors, and the ACA-V, ACC-V multi-
criteria sensors. The sensitivity of the sensor is capable of being measured
by the control panel. The vandal-resistant, security locking feature is used
in those areas as indicated on the drawing. The locking feature is optional
and can be implemented when required.
BASES
The Hochiki HSB-NSA-6
and the YBN-NSA-4 mounting bases are electronic-free and are a simple, rugged
design with screw terminals for wiring connections. A common mounting
base allows sensor interchange and maintains loop continuity when sensors are
removed. A simple anti-tamper head locking system is provided which is enabled
by removing a small plastic tab on the back of the sensor. Once locked, the
head can be removed using a small-diameter screwdriver.
TYPICAL WIRING DIAGRAMS
NOTE: Fire alarm control panel compatibility is required for DCP
products. DCP communications protocol allows system components (DCP sensors
AIE-EA, ALG-V, ACA-V, ACC-V, ALK-V, ALN-V, ATJ-EA, and ATG-EA, bases and
modules) to be used concurrently on a system’s SLC (Signaling Line Circuit).
Hochiki America Corporation ATJ-EA Fixed Temperature / Rate of rising Sensor
Specifications are subject to change without notice.
Hochiki America Corporation
7051 Village Drive, Suite 100, Buena Park, CA 90621-2268
Phone: 714/522-2246 Fax: 714/522-2268
Technical Support:800-845-6692 or
[email protected]
Find the latest revision atwww.hochiki.com
F0187