System Sensor 1251B User manual

D200-28-00 1 I56-1908-02R
1251B Plug-in Intelligent Ionization
Sensor with Communications
INSTALLATION AND MAINTENANCE INSTRUCTIONS
3825 Ohio Avenue, St. Charles, Illinois 60174
1-800-SENSOR2, FAX: [phone]
www.systemsensor.com
Before Installing
This sensor must be installed in compliance with the con-
trol panel system installation manual. The installation must
meet the requirements of the Authority Having Jurisdiction
(AHJ). Sensors offer maximum performance when installed
in compliance with the National Fire Protection Association
(NFPA); see NFPA 72.
General Description
Model 1251B intelligent ionization sensor uses a state-of-
the-art 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. Remote LED annunciator capability is
also available as an optional accessory (RA400Z).
The 1251B requires compatible addressable communica-
tions to function properly. Connect this sensor to listed-
compatible control panels only.
Spacing
System Sensor recommends spacing sensors in compliance
with NFPA 72. In low air flow applications with smooth
ceilings, space sensors 30 feet apart. For specific infor-
mation regarding sensor spacing, placement, and special
applications, refer to NFPA 72 or the System Smoke Detector
Application Guide, available from System Sensor.
Wiring Guide
All wiring must be installed in compliance with the
National Electrical Code, applicable local codes, and any
special requirements of the Authority Having Jurisdiction.
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, non condensing
Operating Temperature Range: 0°C to 49°C (32°F to 120°F)
Height: 2.0 inches (51 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: 5.4 oz. (153 g)
Proper wire gauges should be used. The installation wires
should be color-coded to limit wiring mistakes and ease
system troubleshooting. Improper connections will prevent
a system from responding properly in the event of a fire.
Remove power from the communication line before
installing sensors.
1. Wire the sensor base (supplied separately) per the wir-
ing diagram, see Figure 1.
2. Set the desired address on the sensor address switches,
see Figure 2.
3. Install the sensor into the sensor base. Push the sensor
into the base while turning it clockwise to secure it in
place.
4. After all sensors have been installed, apply power to the
control unit and activate the communication line.
5. Test the sensor(s) as described in the TESTING section
of this manual.
CAUTION
Dust covers provide limited protection against airborne dust
particles during shipping. Dust covers must be removed
before the sensors can sense smoke. Remove sensors prior
to heavy remodeling or construction.
Tamper-Resistance
Model 1251B 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.

D200-28-00 2 I56-1908-02R
32
1
32
1
32
1
+
-
-
+
+ -
Figure 1. Wiring Diagram:
Testing
Before testing, notify the proper authorities that the system
is undergoing maintenance, and will temporarily be out of
service. Disable the system to prevent unwanted alarms.
All sensors must be tested after installation and periodi-
cally thereafter. Testing methods must satisfy the Authority
Having Jurisdiction (AHJ). Sensors offer maximum perfor-
mance when tested and maintained in compliance with
NFPA 72.
Test the sensors as follows:
A. Functional: Magnet Test (P/N M02-04-01 or M02-09-00)
This sensor can be functionally tested with a test mag-
net. The test magnet electronically simulates smoke in
the sensing chamber, testing the sensor electronics and
connections to the control panel.
1. Hold the test magnet in the magnet test area as shown
in Figure 3.
2. The sensor should alarm the panel.
Two LEDs on the sensor are controlled by the panel
to indicate sensor status. Coded signals, transmitted
from the panel, can cause the LEDs to blink, latch
on, or latch off. Refer to the control panel technical
documentation for sensor LED status operation and
expected delay to alarm.
B. Smoke Entry: Aerosol Generator (Gemini 501)
The GEMINI model 501 aerosol generator can be used
for smoke entry testing. Set the generator to represent
4%/ft to 5%/ft obscuration as described in the GEMINI
501 manual. Using the bowl shaped applicator, apply
aerosol until the panel alarms.
A sensor that fails any of these tests should be cleaned
as described under CLEANING, and retested. If the sensor
fails after cleaning, it must be replaced.
When testing is complete, restore the system to the normal
operation and notify the proper authorities that the system
is back in operation.
CAUTION: Do not loop wire under terminal 1 or 2.
Break wire run to provide supervision of connections.
CLASS A OPTIONAL WIRING
REMOTE ANNUNCIATOR
UL LISTED COMPATIBLE
CONTROL PANEL
C0129-00

LED Status
Indicators
Magnet Test
Marker
Test Magnet
Position
Test Magnet
Position
Magnet Test
Marker
LED Status
Indicators
Magnet Test
Marker
Test Magnet
Position
Test Magnet
Position
Magnet Test
Marker
D200-28-00 3 I56-1908-02R
Figure 3. Test Magnet positioning:
TENS ONES
9
8
7
6
5
4
3
210
9
8
7
6
5
4
3
210
Figure 2. Rotary decade address switches:
Sensor
Cover
Sensing
Chamber
and Screen
Cover
Removal
Tabs
Figure 4: Cleaning
Before cleaning, notify the proper authorities that the sys-
tem is undergoing maintenance and will be temporarily
out of service. Disable the system to prevent unwanted
alarms.
1. Remove the sensor to be cleaned from the system.
2. Remove the sensor cover. Press firmly on each of the
four removal tabs that hold the cover in place.
3. Vacuum the outside of the screen carefully. If further
cleaning is required, continue with Step 4, otherwise
skip to Step 5.
4. Use clean, compressed air to remove dust and debris
from the sensing chamber.
5. Replace the cover using the LEDs to align the cover and
then gently pushing it until it locks into place.
6. Reinstall the detector.
7. Test the detector as described in TESTING.
8. Reconnect disabled circuits.
9. Notify the proper authorities that the system is back on
line.
Special Note Regarding Smoke Detector Guards
Smoke detectors are not to be used with detector guards
unless the combination has been evaluated and found
suitable for that purpose.
C0145-00
C0146-00
C0150-00

D200-28-00 4 I56-1908-02R
© 2004 System Sensor
System Sensor warrants its enclosed smoke detector to be free from
defects in materials and workmanship under normal use and service for a
period of three years from date of manufacture. System Sensor makes no
other express warranty for this smoke detector. No agent, representative,
dealer, or employee of the Company has the authority to increase or alter
the obligations or limitations of this Warranty. The Company’s obliga-
tion of this Warranty shall be limited to the repair or replacement of any
part of the smoke detector which is found to be defective in materials or
workmanship under normal use and service during the three year period
commencing with the date of manufacture. After phoning System Sensor’s
toll free number 800-SENSOR2 (736-7672) for a Return Authorization
number, send defective units postage prepaid to: System Sensor, Returns
FCC Statement
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful inter-
ference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These
limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses
and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to
radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause
harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to
try to correct the interference by one or more of the following measures:
– Reorient or relocate the receiving antenna.
– Increase the separation between the equipment and receiver.
– Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
– Consult the dealer or an experienced radio/TV technician for help.
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
Department, RA #__________, 3825 Ohio Avenue, St. Charles, IL 60174.
Please include a note describing the malfunction and suspected cause
of failure. The Company shall not be obligated to repair or replace units
which are found to be defective because of damage, unreasonable use,
modifications, or alterations occurring after the date of manufacture. In
no case shall the Company be liable for any consequential or incidental
damages for breach of this or any other Warranty, expressed or implied
whatsoever, even if the loss or damage is caused by the Company’s neg-
ligence or fault. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation or exclusion
may not apply to you. This Warranty gives you specific legal rights, and
you may also have other rights which vary from state to state.