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B110RLP Plug-in Detector Base

For use with the following smoke detectors: 

In US :    

1151, 2151

In Canada:  

1151A, 2151A 

In Europe:  

1151E, 2151E

INSTALLATION AND MAINTENANCE INSTRUCTIONS

 3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: 630-377-6495

www.systemsensor.com

BEFORE INSTALLING 

Please read thoroughly System Sensor’s 

Applications Guide for System Smoke 

Detectors

 (SPAG91), which provides detailed information on detector spacing, 

placement, zoning, wiring, and special applications. This is available online 
from System Sensor’s website: www.systemsensor.com. (For installations in 
Canada, please refer to CAN4-S524, 

Standard for the Installation of Fire Alarm 

Systems

, and CEC Part 1, Sec. 32.)

NOTICE:

 This manual should be left with the owner/user of this equipment.

IMPORTANT:

 The detector used with this base must be tested and maintained 

regularly following NFPA 72 requirements. The detector used with this base 
should be cleaned at least once a year. 

GENERAL DESCRIPTION

The B110RLP plug-in detector base is used with System Sensor model 1151 and 
1151A ionization detector heads and model 2151 and 2151A  photoelectronic 
detector heads. The capability of plugging these detectors into a variety of 
special bases makes them more versatile than equivalent direct-wired models. 
Refer to the System Sensor catalog for other available plug-in detector bases.

This base is intended for use in 2-wire systems, with screw terminals provided 
for power, ground, and remote annunciator connections. The base also con-
tains a resistor to provide current limiting in the alarm state.

MOUNTING

This detector base mounts directly to 3-

½

- inch and 4-inch octagon boxes, and 

4-inch square boxes (with or without plaster rings). To mount, remove deco-
rative ring by turning it in either direction to unhook the snaps, then separate 
the ring from the base. Install the base to the box using the screws supplied 
with the junction box and the appropriate mounting slots in the base. Place 
decorative ring onto base, then turn in either direction until the ring snaps in 
place (see Figure 1).

INSTALLATION GUIDELINES

All wiring must be installed in compliance with the National Electrical Code 
and the local codes having jurisdiction. Proper wire gauges should be used. 
The conductors used to connect smoke detectors to control panels and acces-
sory devices should be color-coded to reduce the likelihood of wiring errors. 
Improper connections can prevent a system from responding properly in the 
event of a fire.

SPECIFICATIONS

Base Diameter: 

6.2 inches (157 mm)

Base Height: 

0.95 inches (24 mm)

Weight: 

0.3 lb. (130 g)

Mounting: 

4-inch square box with or without plaster ring. Min. Depth–1.5 inches

 

4-inch octagon box. Min. Depth–1.5 inches

 

3-1/2 inch octagon box. Min. Depth–1.5 inches

Operating Temperature Range: 

0° to +49°C (32° to 120°F)

Operating Humidity Range: 

10% to 93% Relative Humidity

Electrical Ratings — includes base and detector

System Voltage: 

24 VDC

Maximum Ripple Voltage: 

4 Volts peak to peak

Start-up Capacitance: 

0.02 µF Maximum

Standby Ratings: 

17 VDC Minimum; 32 VDC Maximum

 

120 µA Maximum

Alarm Ratings: 

10 mA Minimum at 10.5 VDC; 62 mA Maximum at 32 VDC

 

(If used, the RA400 remote lamp operates within specified detector alarm currents.)

Maximum Alarm Impedance: 

1050

Ω

Minimum Alarm Impedance: 

516

Ω

Reset Voltage: 

2.50 VDC Minimum

Reset Time: 

0.3 Seconds Maximum

Start-up Time: 

34.0 Seconds Maximum

SNAP ON 

DECORATIVE 

RING

SCREWS 

(NOT SUPPLIED)

DETECTOR 

BASE

BOX

(NOT SUPPLIED)

SHORTING 

SPRING

C503-00

FIGURE 1. MOUNTING BASE TO BOX:

I56-0

596-00

5R

  

I56-0596-005R 

 

 06-10

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