Before installing sensors, refer to NFPA 72, and 101 (Life Safety Code) for information on sensor spacing, placement, zon-
ing, and special applications.
GENERAL DESCRIPTION
Model 5251P is an intelligent sensor that utilizes a state-of-the-art thermistor sensing circuit for fast response. This sensor
is designed to provide open area protection with 50 foot spacing capability and is intended for use with compatible con-
trol panels only.
Two LEDs on each sensor light to provide 360° visibility of the sensor indication. The LEDs can be latched ON by code
command from the panel for an alarm indication. The LEDs can also be unlatched to the normal condition by code com-
mand. Remote LED annunciator capability is available as an optional accessory (Part No. RA400Z).
SPECIFICATIONS
Diameter:
Height:
Weight:
Installation Temperatures:
Operating Humidity Range:
Mounting:
Voltage Range:
Standby Current:
LED Current:
Fixed Temperature Rating:
6.1 inches (155 mm) installed in B210LP
4.1 inches (104 mm) installed in B501
2.0 inches (51 mm)
5 ounces (150 gm)
-4° F to 100° F (-20° C to 38° C)
10% to 93% Relative Humidity Non-condensing
B210LP flanged base
B501 flangeless base
B501 with RMK400 recessed mounting kit
15 to 32 Volts DC Peak
300
µ
A @ 24 VDC (one communication every 5 seconds with LED blink enabled)
6.5 mA @ 24 VDC
135° F (57° C)
WIRING GUIDE
Refer to the installation instructions for the particular plug-in base being used: 1) for the B210LP base (D250-01-00); 2) for
the B501 base (D550-02-00); 3) for the RMK400 used with the B501 base (D450-07-00). Bases are provided with screw ter-
minals for power, ground, and remote annunciator connections. See Figure 1.
D200-88-00
1
I56-1331-02R
NOTE: All wiring must conform to applicable local codes, ordinances, and regulations.
NOTE: Verify that all sensor bases are installed and that the wiring polarity is correct at each base.
WARNING:
Disconnect the power from the loop before installing sensors.
1. Install Sensors:
a. Verify that the sensor type matches the type written on the label in the base.
b. Set the sensor to a desired address and then write the address on the label on the base.
c. Place the sensor into the sensor base.
d. Turn the sensor clockwise until it drops into place.
e. Continue turning the sensor clockwise to lock it in place.
REMOTE ANNUNCIATOR
+
-
CAUTION: Do not loop wire under terminal 1 or 2.
Break wire run to provide supervision of connections.
+
U.L. LISTED COMPATIBLE
CONTROL PANEL
3
2
1
3
2
1
3
2
1
-
-
+
CLASS A OPTIONAL WIRING
A78-1253-01
Figure 1
2. Tamper Resistance:
The sensor bases have a tamper-resistant capability. When this capability is enabled, sensors cannot be removed from
the base without the use of a small screwdriver or other similar tool. Refer to the sensor base installation instruction
manual for details in using this capability.
3. After all sensors have been installed, apply power to the control unit.
4. Test the sensor by placing a small magnet against the sensor plastic, as shown in Figure 2. The alarm level should be
recognized in the panel and the LED controlled by communication command from the panel.
5. The reset of the sensor LED is controlled by communication command from the panel.
TESTING
Sensors must be tested after installation and periodic maintenance. The sensor may be tested in the following ways.
A. Test Magnet (Model No. M02-04)
1. Place the magnet against the cover in the magnet test area as shown in Figure 2 to activate the test feature.
2. The LEDs should latch ON within 10 seconds, indicating alarm and annunciating the panel.
3. Reset the detector at the system control panel.
B. Test sensitivity from the control panel.
C. Direct Heat Method (Hair dryer of 1000 – 1500 watts)
1. From the side of the detector, direct the heat toward the sensor. Hold the heat source about 6 inches (15cm) away to
prevent damage to the cover during testing.
D200-88-00
2
I56-1331-02R
2. The LEDs on the detector should light when the temperature at the detector reaches 135° F (57° C). If the LEDs fail
to light, check the power to the detector and the wiring in the detector base.
3. Reset the detector at the system control panel.
Detectors that fail these tests should be cleaned as described under MAINTENANCE and retested. If the detectors still fail
these tests they should be returned for repair.
LED
PAINTED
SURFACE
PAINTED
SURFACE
MA TES
GN T
ET
LED
TEST
MAGNET
A78-1478-05
MAGNET TEST MARKER
Figure 2. Views showing position of test magnet.
MAINTENANCE
NOTE: Before cleaning notify the proper authorities that the system is undergoing maintenance, and therefore the system
will temporarily be out of service. Disable the loop or system undergoing maintenance to prevent unwanted
alarms.
It is recommended that the sensor be removed from its mounting base for easier cleaning and that sensors be cleaned at
least once a year. Use a vacuum cleaner to remove dust from the sensing chamber. See Figure 3.
A78-1944-01
Figure 3
D200-88-00
3
I56-1331-02R
Please refer to insert for the Limitations of Fire Alarm Systems
Three-Year Limited Warranty
System Sensor warrants its enclosed heat 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 heat detector. No agent, representative, dealer, or
employee of the Company has the authority to increase or alter the obliga-
tions or limitations of this Warranty. The Company’s obligation of this
Warranty shall be limited to the repair or replacement of any part of the
heat 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, Repair Depart-
ment, 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, modifica-
tions, 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 negligence or fault.
Some states do not allow the exclusion or limitation of incidental or conse-
quential 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.
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 interfer-
ence, 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 commu-
nications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interfer-
ence 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.
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