2151 Duct Smoke
Detector for
Special Applications
The System Sensor 2151 low-profile photoelectric smoke
detector with a B114LP or B114LPBT base is listed to
Underwriters Laboratories 268A specifically for use in noflow/low-flow air-handling systems.
Features for 2151/B114LP/B114LPBT
• Low-profile smoke detector design
• Low standby current
• Two LEDs blink in standby
• Detector head plugs easily into base
• F
ield sensitivity metering of detector to meet the requirements
of NFPA 72 with the use of SENS-RDR
• Designed for mounting on a standard electrical box
• Removable cover and insect screen for field cleaning
• Accepts 24 or 120V supply voltage
Agency Listings
S911
The 2151 can be used as a pendant mount detector in no-flow/
low-flow air-handling systems (0-3,000 FPM). The pendant /plenum
mounted 2151 is to be installed into a B114LP or B114LPBT
base. This is the perfect combination for installation in ducts where
the air velocity is below 500fpm or for duct sizes as small as 8” in
diameter.
Pendant mounted in a standard electrical box within the duct, the
twist-in/twist-out head allows easy removal from the base for quick
cleaning and maintenance. The 2151 heads can be combined with
the System Sensor B114LP 120VAC base or the B114LPBT 24VAC/
DC base.
2151 Photoelectric Detector Specifications
Architectural/Engineering Specifications
The air duct smoke detector shall be a System Sensor model 2151 Series Smoke detector listed to UL 268A specifically for use in air handling
systems when used in conjunction with the B114LP or B114LPBT base. The detector shall operate at air velocities up to 3,000 feet per minute.
It shall be capable of local testing using a magnet test on the 2151 sensor head.
Physical Specifications
Size
Weight
Operating Temperature Range
Operating Humidity Range
1.66” (4.22cm) H
3.6 oz (104 g)
32˚F to 120˚F (0˚C to 49˚C)
10 to 93% relative humidity non-condensing
B114LP/B114LPBT Plug-In Detector Base
Physical Specifications
Diameter
Mounting
Operating Temperature Range
6.1 inches (155mm)
4-inch (102 mm) square box with or without plaster ring; Minimum Depth - 1.5 inches (38 mm)
4-inch Octagon Box; Minimum Depth - 1.5 inches (38 mm)
Refer to applicable sensor Operating Temperature Range using the Base/Sensor Cross Reference Chart
at systemsensor.com
B114LP Typical Wiring Diagrams
RA100Z
(Optional)
B114LP Base Terminals
No. Function
1
Remote Annunciator (+)
2
Not Used
3
Not Used
4
Remote Annunciator (–)
5
Not used
6
N.O. Supervisory Relay
7
N.O. Form A Contacts
8
N.O. Alarm Relay
9
N.O. Form A
10 C.
Initiation
11 C.
Contacts
12 N.O. Alarm Relay
13 N.C.
Form C
14 C.
Auxiliary Contacts
EOL
2
6
120 VAC
FIRE
ALARM
CONTROL
PANEL
7
14
5
1
10
9
8
13
11
SPECIFIED
BY PANEL
MANUFACTURER
12
ALARM INITIATION LOOP
S0279-01
FAN/DAMPER
CONTROL
POWER
(+)
6
RELEASING
DEVICE
4
3
EOL
2
2
7
14
5
1
120 VAC
RA100Z
(Optional)
(–)
4
3
BLACK LEADS
TRANSFORMER
PRIMARY
(+)
RA100Z
(Optional)
(–)
FIRE
ALARM
CONTROL
PANEL
4
3
BLACK LEADS
TRANSFORMER
PRIMARY
9
8
10
13
11
12
120 VAC
1
6
7
14
5
8
9
10
13
11
SPECIFIED
BY PANEL
MANUFACTURER
12
ALARM INITIATION LOOP
POWER
RELEASING
DEVICE
POWER
S02809-01
RELEASING
DEVICE
NOTE: ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED
SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.
SUPERVISORY
RELAY
SUPERVISORY
RELAY
EOL
HVDS00700
CONTROL
PANEL
ALARM
RELAY
ALARM
RELAY
SPECIFIED
BY PANEL
MANUFACTURER
B114LPBT Typical Wiring Diagrams
B114LPBT Base Terminals
No. Function
1
Remote Annunciator (+)
2
Test Coil (+)
3
Not Used
4
Remote Annunciator (–)
5
RTC (–)
6
C.
Supervisory Relay
7
N.O. Form A Contacts
8
N.O. Alarm Relay
9
N.O. Form A
10 C.
Initiation
11 C.
Contacts
12 N.O. Alarm Relay
13 N.C.
Form C
14 C.
Auxiliary Contacts
3 APA151
2
1 (Optional)
4
3
2
24 VACrms/DC
6
7
14
5
1
8
9
10
POWER
13
11
12
FAN / DAMPER
SHUTDOWN
H0269-01
3 APA151
2
1 (Optional)
RELEASING
DEVICE
4
3
FIRE
ALARM
CONTROL
PANEL
EOL
7
14
5
1
6
RELEASING
DEVICE
4
3
2
2
24 VACrms/DC
3 APA151
2
1 (Optional)
8
9
10
13
11
12
24 VACrms/DC
5
1
6
7
14
8
9
10
13
11
SPECIFIED
BY PANEL
MANUFACTURER
12
ALARM INITIATION LOOP
H0268-01
NOTE: ABOVE DIAGRAM SHOWS NFPA REQUIRED WIRING OF SUPERVISED
SYSTEMS. SCHEMATIC SHOWN BELOW FOR REFERENCE.
SUPERVISORY
RELAY
SUPERVISORY
RELAY
EOL
CONTROL
PANEL
ALARM
RELAY
ALARM
RELAY
SPECIFIED
BY PANEL
MANUFACTURER
HVDS00700
Ordering Information
Part No.
2151
B114LP
B114LPBT
Description
Low-profile photoelectric plug-in detector (order the base listed below)
120 VAC detector base
24VAC/DC detector base
3825 Ohio Avenue • St. Charles, IL 60174
Phone: 800-SENSOR2 • Fax: 630-377-6495
www.systemsensor.com
©2012 System Sensor.
Product specifications subject to change without notice. Visit systemsensor.com
for current product information, including the latest version of this data sheet.
HVDS00700 • 1/12