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400 Series
™
High-Temperature
Duct Smoke Detector
Models Available
DH400ACDCIHT
4-wire ionization high-temperature duct
smoke detector
Product Overview
System Sensor DH400ACDCIHT is designed for interior
or exterior duct applications where extreme temperatures
can exceed standard detector capabilities. (For exterior
applications use DH400 OE-1 outdoor enclosure.) The
DH400ACDCIHT samples air currents passing through a
Temperature range 32° – 158°F (0° – 70°C)
Air velocity rating from 500 – 4,000 FPM
24 VAC/DC or 120/220 VAC operation
Easy and quick mounting to round or rectangular
ducts from 1′ – 12′ (0.3 – 3.7 meters) wide
3-year warranty
duct to provide dependable performance for management
of fans, blowers, and air conditioning systems. The twist-in,
twist-out 1451DHHT High-Temperature ionization detec-
tor head allows easy removal for quick cleaning, mainte-
nance, and replacement without removing the duct housing.
Agency Listings
DH400ACDCIHT
APA451
RTS451KEY
RTS451
RA400Z
PA400W
UL S911
UL S4011
UL S2522
UL S2522
UL S2522
UL S3593
Accessories
System Sensor provides system flexibility with a variety of
accessories, including two remote test stations, and several
different means of visible and audible system annunciation.
As with our duct detectors, all duct detector accessories are
UL listed.
ALARM
ALARM
POWER
RESET
ON
TEST
F
I
R
E
PA400W with
PS24LOW Add-on Strobe
ALARM
RESET
APA451
Piezo
Annunciator
RTS451KEY
Remote Test
Station with Key
RTS451
Remote Test
Station
RA400Z
Remote
Annunciator
Architect/Engineer Specifications
The air duct smoke detector shall be a System Sensor
Model DH400ACDCIHT Series Duct Smoke Detector.
The detector shall be UL listed per UL S911, standard
for Smoke Detectors for Duct Applications, specifically
for use in air handling systems. The detector shall oper-
ate at air velocities from 500 feet per minute to 4000
feet per minute. The detector shall have an operating
temperature range of 32˚F to 158˚F. The detector housing
shall be equipped with an integral mounting base capable
of accommodating ionization detector heads. It shall be
capable of local testing via magnetic switch or remote test-
Electrical Specifications
Power Supply Voltage
20 - 29 VDC
ing using the RTS451KEY or RTS451 Remote Test Station.
The duct detector housing shall incorporate an airtight
smoke chamber in compliance with UL S911. The housing
shall be capable of mounting to rectangular or round ducts
up to 12′ wide without adapter brackets. An integral filter
system shall be included to reduce dust and residue effects
on detector and housing, thereby reducing maintenance
and servicing. Sampling tubes shall be installed after the
housing is mounted to the duct by passing through the duct
housing. Terminal connections shall be of the strip and
clamp method suitable for 14–18 AWG wiring.
24 VAC 50 - 60 Hz
120 VAC 50 - 60 Hz
220/240 VAC 50 - 60 Hz
CURRENT REQUIREMENTS (USING NO ACCESSORIES)
Max. standby current
Max. alarm current
CONTACT RATINGS
Alarm initiation contacts (SPST)
Alarm auxiliar y contacts (DPDT)
Trouble contacts (SPST)
2.0A @ 30 VAC/DC (0.6 power factor)
10A @ 30 VDC
10A @ 250 VAC
0.3 @32 VDC (resistive)
Device
AP451
25 mA
95 mA
35 mA RMS
55 mA RMS
20 mA RMS
55 mA RMS
20 mA RMS
30 mA RMS
Accessory Current Loads at 24 VDC
Standby
12mA max.
0mA max.
0mA max.
0mA max.*
12mA max.*
Alarm
30mA max.
15mA max.
7mA max.
8mA max.
8mA max.
PA400W
RA400Z
RTS451
*NOTE: When initiating an alarm, the RTS451 and RTS451KEY require 103mA in alarm. Nominal standby
current is 0mA. Alarm current is 8 mA maximum when test magnet is removed.
NOTE: Accessories are only rated to 120°F and must be installed indoors.
RTS451KEY
ANY COMBINATION OF ACCESSORIES MAY BE USED SUCH THAT THE
GIVEN CURRENT LOADS TOTAL:
100mA OR LESS IN THE STANDBY STATE,
150mA OR LESS IN THE ALARM STATE.
Physical Specifications
Length:
14.5 inches (36.8 cm)
Width:
5 inches (12.7 cm)
Depth:
4 inches (10.2 cm)
Weight:
4.5 lbs. (2.0 kg)
Operating Temperature Range:
32º to 158ºF (0º to 70ºC)
Storage Temperature Range:
–22º to 158ºF (–30º to 70ºC)
Air Duct Velocity:
500 to 4000 ft./min.
Operating Humidity Range:
10% to 93% relative humidity
Voltage:
24 VAC/VDC or 120/220 VAC
Ordering Information
Model
1451DHHT
ST-1.5
ST-3
ST-5
ST-10
P48-21-00
APA451
DH400OE-1
Description
RTS451KEY
RTS451
PA400W
PS24LOW
RA400Z
CRT400
F36-05-00
MOD400R
M02-04-00
RS14
A2650-01
Remote test station with key
Remote test station
Piezo sounder (white)
Add-on strobe (white)
Remote annunciator alarm LED
Ion cover removal tool
Replacement air filters (two per package)
Sensitivity test module
Test magnet
Ion replacement screen
Replacement installation kit (mounting hardware)
smoke detector
sensor head
Metal sampling tube duct widths 1′–2′
Metal sampling tube duct widths 2′–4′
Metal sampling tube duct widths 4′–8′
Metal sampling tube duct widths 8′–12′
End cap for metal sampling tubes
Annunciator with piezo alarm and power LEDs
Weatherproof Outdoor Enclosure
DH400ACDCIHT 4-wire ionization high-temperature duct
Replacement ionization high-temperature
System Sensor Sales and Service
System Sensor Headquarters
3825 Ohio Avenue
St. Charles, IL 60174
Ph: 800/SENSOR2
Fx: 630/377-6495
www.systemsensor.com
System Sensor Canada
Ph: 905.812.0767
Fx: 905.812.0771
System Sensor Europe
Ph: 44.1403.891920
Fx: 44.1403.891921
System Sensor in China
Ph: 86.29.8832.0119
Fx: 86.29.8832.5110
System Sensor in Singapore
Ph: 65.6273.2230
Fx: 65.6273.2610
System Sensor – Far East
Ph: 85.22.191.9003
Fx: 85.22.736.6580
System Sensor – Australia
Ph: 613.54.281.142
Fx: 613.54.281.172
System Sensor – India
Ph: 91.124.637.1770 x.2700
Fx: 91.124.637.3118
System Sensor – Russia
Ph: 70.95.937.7982
Fx: 70.95.937.7983
©
2003 System Sensor. The company reserves the right to change product specifications without notice.
A05-0953-002•10/03•#1169
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