System Sensor 1251 User Manual

D200-51-00 1 I56-548-07R

1251 Plug-in Intelligent Ionization
Sensor with Communications

INSTALLATION AND MAINTENANCE INSTRUCTIONS

A Division of Pittway

3825 Ohio Avenue, St. Charles, Illinois 60174

1-800-SENSOR2, FAX: [phone]

Before Installing

Please read the system wiring and installation manual, I56-

407. This manual includes detailed information on sensor
spacing, placement, zoning, and special applications.
Copies of this manual are available from System Sensor.

General Description

Model 1251 intelligent ionization sensor uses a state-of-the­art sensing chamber. These sensors are designed to provide
open area protection and are intended for use with com­patible control panels only.

Two LEDs on each sensor light to provide a local, visible
sensor indication. The LEDs can be latched on by code
command from the control panel for an alarm indication.
The LEDs can also be unlatched to the normal condition by
code command. Remote LED annunciator capability is also
available as an optional accessory (RA400Z).

Wiring Guide

Refer to the installation instructions for the plug-in base
being used. As indicated in Figure 1, terminals for power,
ground, and the optional RA400Z Remote Annunciator are
included in the base. Base Models B210LP (shown in Figure

1) and B501 are electrically identical.

NOTE: All wiring must conform to all applicable codes,

ordinances, and regulations.

NOTE: Verify that all sensor bases are installed and that

polarity of the wiring is correct at each base.

Specifications

Operating Voltage Range: 15 to 32 VDC
Max. Avg. Standby Current: 300µA @ 24 VDC (one communication every 5 sec. with LED blink enabled)
Max. Alarm Current (LED on): 6.5 mA @ 24 VDC
Operating Humidity Range: 10% to 93% Relative Humidity, noncondensing
Operating Temperature Range: 0° to 49°C (32° to 120°F)
Height: 1.7 inches (43 mm) installed in B210LP Base
Diameter: 6.1 inches (155 mm) installed in B210LP Base

4.1 inches (104 mm) installed in B501 Base

Weight: 3.6 oz. (102 g)

Disconnect loop power before installing sensors.

1. Sensor Installation
a. Set the sensor to the desired address and record that

address on the label attached to the base.

b. Insert the sensor into the base and rotate it clockwise

until it drops into place.

c. Continue to rotate the sensor until it locks into the

base.

Dust covers are an effective way to limit the entry of dust
into smoke detector sensing chambers. However, they may
not completely prevent airborne dust particles from enter­ing the detector. Therefore, System Sensor recommends the
removal of detectors before beginning construction or other
dust producing activity.
Be sure to remove dust covers from any sensors that were
left in place during construction as part of returning the
system to service.

CAUTION

WARNING

D200-51-00 2 I56-548-07R

3

2

1

3

2

1

3

2

1

+

-

-

+

U.L. LISTED COMPATIBLE

CONTROL PANEL

CLASS A OPTIONAL WIRING

REMOTE ANNUNCIAT OR

+-

CAUTION: Do not loop wire under terminal 1 or 2.
Break wire run to provide supervision of connections.

Figure 1:

2. Tamper-Resistance
Model 1251 includes a tamper-resistant capability that

prevents their removal from the bracket without the use
of a tool. Refer to the base manual for details on making
use of this capability.

3. After all sensors have been installed, apply power to the

system.

4. See Figure 2. Test the sensor by positioning a test mag-

net against the sensor plastic just to the left of LED1.
The alarm level should be recognized at the panel and
the LED controlled by communication command from
the panel.

5. Reset the sensor by communication command from the

panel.

Testing

Detectors must be tested after installation and following
periodic maintenance. However, before testing, notify the
proper authorities that the smoke detector system is under­going maintenance and the system will be temporarily out
of service. Disable the zone or system undergoing mainte­nance to prevent unwanted alarms.

In addition, check to ensure that the LEDs blink. If they do
not, power has been lost to the detector (check the wiring),
or it is defective (return it for repair).

Test the sensors as follows:
A. Test Magnet (p/n M02-04-01 or M02-09-00)

1. Test the sensor by positioning the optional test mag­net against the sensor plastic just to the left of LED1,
as shown in Figure 2.

2. Both LEDs should latch on within 30 seconds, indi­cating an alarm and annunciating the panel.

B. Aerosol Generator in accordance with NFPA 72.

The Gemini Model 501 aerosol generator can be used
to test the sensor. Set the generator to represent 4%/ft to
5%/ft obscuration, following the instructions in the gen­erator manual. Use a bowl shaped applicator to apply
aerosol to the sensor. It should alarm after 30 seconds.