Models Available

1551B Ionization Sensor

2551HR Photoelectronic Sensor

5551B Fixed Temperature Thermal Sensor

2551THR High Resolution Photo Sensor with Thermal

5551R Rate-of-Rise/Fixed Temperature Thermal Sensor

Intelligent Sensors with

Integral Communications

© System Sensor 4/97

This document is not intended to be used for installation purposes.

A05-228-01

A Division of Pittway

3825 Ohio Avenue, St. Charles, IL 60174

1-800-SENSOR2 (736-7672), Fax 630-377-6495

http://www.systemsensor.com

Features

• Low standby current

• Shielded electronics

• Noise immunity provides stable communications

• Compact, stylish design

• Sensor plugs easily into base

• Built-in tamper-resist feature

• Sealed against dirt, insects, and back pressure

• SEMS screws for easy wiring

• Easy to use decade address switches

• Built-in type ID

System Sensor Intelligent Sensors

offer features and

performance that surpass conventional sensors. The

sensitivity of models 1551B, 2551HR, and 2551THR can be

“set” individually in the panel software. The sensors may

be continuously monitored for changes in sensitivity and

compensate for dirt, temperature, or humidity to maintain

the set sensitivity. Model 5551R offers a rate-of-rise

temperature response while the 5551B offers a fixed

temperature response.

Specifications – 2551HR, 2551THR

Dimensions

Height:

3.2

″ (8.1 cm), detector in base

(add .5

″ [1.27 cm] for thermal)

Diameter:

4.0

″ (10.2 cm) installed in

B501 base

6.1

″ (15.5 cm) installed in

B501B base

Shipping Weight:

9.6 ounces (272 g)

Temperature Range

2551HR:

32

° to 120°F (0° to 49°C)

2551THR:

32

° to 100°F (0° to 38°C)

Humidity Range:

10% to 93% RH noncondensing

Air Velocity Rating:

3,000 fpm

Operating Voltage:

15–32 VDC peak, 6.5 mA

current for visible LEDs

latched on

Standby Current:

230

µA

Sensor (2551HR):

Photoelectronic

(scattering principle)

Thermal Sensor

(2551THR):

135

°F fixed temperature alarm

Smoke Detector Spacing:

On smooth ceilings (as defined in NFPA 72) spacing of

30 feet (900 sq. ft.) may be used as a guide. See NFPA

72 for more details on spacing requirements.

APPROVED

MSFM