2D51 Duct Smoke

Detector for
Special Applications
The System Sensor 2D51 low-profile photoelectric smoke
detector with a B210LP base tied to the D4P120 is listed
to Underwriters Laboratories 268A specifically for use in
no-flow/low-flow air-handling systems.

Features for 2D51/B210LP/D4P120 The 2D51 can be used as a pendant mount detector in no-flow/
low-flow air-handling systems (0-4,000 FPM). The pendant /plenum
• Low-profile smoke detector design
mounted 2D51 is to be installed into a B210LP base and wired to a
• Low standby current D4P120 power board-only control unit. The D4P120 power board is
• Two LEDs blink in standby capable of controlling up to two 2D51 sensors.

• Detector head plugs easily into base

Pendant mounted in a standard electrical box within the duct, the
• Built-in test switch twist-in/twist-out head allows easy removal from the base for quick
• F
 ield sensitivity metering of detector to meet the requirements cleaning and maintenance. The 2D51 heads can be locally tested
of NFPA 72 with the use of RTS2/RTS2-AOS and SENS-RDR using a magnet or by using the test/reset push button on the D4P120
power board.
• Designed for mounting on a standard electrical box

• SEMS screws for easy wiring and positive wire retention Remote testing is accomplished using the RTS151, RTS151KEY,
• Removable cover and insect screen for field cleaning RTS-2 or RTS-AOS accessories connected to the D4P120 power
board.
• Remote push button Test/Reset, LEDs provide visual indications

• Onboard supervisory and alarm relays The APA151, RTS2 and RTS2-AOS Remote Annunciators with Piezo
• Accepts 24 or 120V supply voltage Alarm can also be connected to the D4P120 power board to provide
an audible and visible indication of smoke detector status.
• Interconnect up to 100 units for common functions

• C
 ompatible for interconnection with System Sensor InnoviarFlex™
D4120 or D4120W duct smoke detectors and remote accessories

Agency Listings

S911 3029700 7272-1653:203

Free Datasheet http://www.datasheet4u.com/

2D51 Photoelectric Detector Specifications
Architectural/Engineering Specifications
The air duct smoke detector shall be a System Sensor model 2D51 Series Smoke detector listed to UL 268A specifically for use in air handling
systems when used in conjunction with the B210LP base. The detector shall operate at air velocities up to 4,000 feet per minute. It shall be
capable of local testing using a magnet test on the 2D51 or using a test/reset button on the D4P120 power board. It can also be remotely
tested using the RTS151, RTS151KEY, RTS2 or RTS2-AOS connected to the D4P120 power board. It shall be capable of providing duct
smoke detector status via the UL-listed APA151, RTS2 and RTS2-AOS Piezo Annunciators.
Physical Specifications
Size 2.0 inches H, 4.1 inches D
Weight 3.1 oz (88 g)
Operating Temperature Range -4˚F to 158˚F (-20˚C to 70˚C)
Operating Humidity Range 10 to 95% relative humidity non-condensing
B210LP Plug-In Detector Base
Physical Specifications
Diameter 6.1 inches (155mm)
Mounting 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)
31/2-inch Octagon Box; Minimum Depth - 1.5 inches (38 mm)
Single Gang Box; Minimum Depth - 1.5 inches (38 mm)
Operating Temperature Range Refer to applicable sensor Operating Temperature Range using the Base/Sensor Cross Reference Chart
at systemsensor.com

D4P120 Power Board

Physical Specifications
Size: 7.66 inches (19.45 cm) Length; 4.98 inches (12.64 cm) Width; 2.29 inches (5.81 cm) Depth
Operating Temperature Range: –40° to 158°F (–40° to 70°C)
Storage Temperature Range: –40° to 158°F (–40° to 70°C)
Operating Humidity Range: 0 to 95% relative humidity non-condensing
Weight: 1 lb 3 oz
Electrical Ratings
Power supply voltage: 20–29 VDC 24 VAC 50–60 Hz 120 VAC 50–60 Hz
Input capacitance: 270 µF max. 270 µF max. N/A
Reset voltage: 3.0 VDC min. 2.0 VAC min. 10 VAC min.
Reset time: (with RTS451) .03 to 0.3 sec. .03 to 0.3 sec. .03 to 0.3 sec.
Reset time: (by power down) 0.6 sec. max. 0.6 sec. max. 0.6 sec. max.
Power up time: 35 sec. max. 35 sec. max. 35 sec. max.
Alarm response time: 15 sec. 15 sec. 15 sec.
Sensitivity test: See detector label See detector label See detector label
Current Requirements: (Using No Accessories)
Max. standby current: 21 mA @ 24 VDC 65 mA RMS @ 24 VAC 60 Hz 20 mA RMS @ 120 VAC
60 Hz
Max. alarm current: 65 mA @ 24 VDC 135 mA RMS @ 24 VAC 60 35 mA RMS @ 120 VAC
Hz 60 Hz
Contact Ratings
Alarm initiation contacts: 2.0 A @ 30 VDC (resistive)
(SPST)
Alarm auxiliary contacts: 10 A @ 30 VDC (resistive); 10A @ 250 VAC (resistive); ½ HP @ 240 VAC ; ¼ HP @ 120 VAC
(DPDT)
Note: Alarm auxiliary contacts shall not be connected to initiating circuits of control panels. Use the alarm initiation contact for this purpose.
Supervisory contacts: (SPDT) 2.0 A @ 30 VDC (resistive); 2.0 A @ 125 VAC (resistive)
Accessory Current Loads at 24 VDC
Device Standby Trouble Alarm
APA151 12.5 mA n/a 30 mA Max.
MHR/MHW 0 mA n/a 29 mA Max.
RA100Z 0 mA n/a 12 mA Max.
RTS151/RTS151KEY 0 mA/12 mA n/a 12 mA Max.
RTS2/RTS2-AOS 3.0 mA max 16 mA Max. with strobe: 55 mA max; without strobe 30 mA max
Note: Any combination of accessories may be used such that the given accessory loads are: 110 mA or less at the Aux output, and 50 mA or less
at the Alarm output.
HVDS00302

Free Datasheet http://www.datasheet4u.com/

B210LP Typical Wiring Diagrams

B210LP
TAMPER PROOF
TAB BASE
TERMINAL 2

BASE
TERMINAL 3
B210LP
BASE
2 TERMINAL 1

+ –
3 1
3 2 1

SENSOR #1
TERMINALS

FIELD SELECTABLE
DIP SWITCHES FIELD INSTALLED
JUMPER WIRE
SENSOR #2 GROUND
TERMINALS SCREW

Y Y R B
TAMPER + –
1/2 SENSORS
OFF/ON TRBL SHUTDN
7/0 MIN TMPR DELAY

Y Y R B Y Y R B 120 VAC
TAMPER + - TAMPER + -

AUX OUT +, 19

24V AC/DC, 10
AUX OUT -, 20
SENSOR 1 SENSOR 2

24V AC/DC, 9
SENSOR 1

INT/AUX-, 1
ALARM, 15
R TEST, 11
R RESET, 2

INT+, 12
ACC +
ACC -

D4P120
4, C

5, NO

13, NC

3, C

14, N0

16, NC

6, C

17, NO

8, NC

18, C

7, NO
ALARM SUP AUX A AUX B

120
POWER VAC INPUT
BOARD LED 2
TEST/RESET 24 VAC/
POWER BUTTON DC INPUT
BOARD LED 1

POWER INPUTS (NOTE 1) POWER INPUTS (NOTE 1)

24VAC/DC 120 24V 120
VAC VAC

9 10 9 10

OR OR

AUXILIARY CONTACTS AUXILIARY CONTACTS

FOR FAN SHUTDOWN, ETC. (NOTE 2) FOR FAN SHUTDOWN, ETC. (NOTE 2)
AUX A AUX B AUX A AUX B
N.C. C. N.O. N.C. C. N.O. N.C. C. N.O. N.C. C. N.O.

16 6 17 8 18 7 16 6 17 8 18 7

EOL RESISTOR
SPECIFIED BY
PANEL
SUPERVISORY CONTACTS SUPERVISORY CONTACTS MANUFACTURER
(NOTE 3) (NOTE 3)
SUP N.O. SUP C SUP N.O. SUP C

UL/FM LISTED 14 3 14 3
4-WIRE
CONTROL PANEL

+
ALARM 5 ALARM N.O. ALARM 5 ALARM N.O.
ALARM INITIATION INITIATION
INITIATION CONTACTS CONTACTS
LOOP (NOTE 4) (NOTE 4)
4 ALARM C 4 ALARM C

FIRST DETECTOR IN THE LOOP LAST DETECTOR IN THE LOOP

NOTE 1: 24V Power Inputs accept a non-polarized 24 VDC or 24 VAC

50-60Hz. 120 VAC Power Inputs accept only 120 VAC 50-60 NOTE 3: Supervisory contacts shown in standby position. Open
Hz. Connect power source to appropriate terminals of each contacts indicate a trouble condition to the panel. See
detector. See specifications for additional power supply specifications for contact ratings.
information.
NOTE 4: Alarm Initiation contacts shown in standby position. Closed
NOTE 2: A
 uxiliary contacts shown in standby position. Contacts contacts indicate an alarm condition to the panel. See
switch during alarm as indicated by arrows. Auxiliary specifications for contact ratings.
contacts are not to be used for connection to the control
panel. See specifications for contact ratings.

*Please refer to the corresponding installation manual for detailed installation instructions and accessory wiring diagrams.

HVDS00302

Free Datasheet http://www.datasheet4u.com/

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 smoke detectors, all duct smoke detector accessories are UL listed.

RTS151 UL S4011 RTS151KEY UL S2522 APA151 UL S4011 RTS2-AOS UL S2522

RA100Z UL S2522 MHW UL S4011 AOS

Top Mount in Ventilation Shaft D4P120 Power Board

Ordering Information
Part No. Description
2D51 Low-profile photoelectric plug-in detector (order the base listed below)
B210LP 120 VAC detector base
D4P120 4-wire photoelectric power board component only, 24 VAC/DC, 120 VAC
RTS151 Remote test station
RTS151KEY Remote test station with key lock
APA151 Remote annunciator with Piezo alarm
RTS2-AOS Multi-signaling accessory
RA100Z Remote annunciator alarm LED
MHW Mini horn, white
AOS Add-on strobe

3825 Ohio Avenue • St. Charles, IL 60174 ©2012 System Sensor.

Phone: 800-SENSOR2 • Fax: 630-377-6495 Product specifications subject to change without notice. Visit systemsensor.com
for current product information, including the latest version of this data sheet.
www.systemsensor.com HVDS00302 • 1/12

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