System Sensor 1551B Plug-in Intelligent - Manual (Page 3)

D500-40-00 3 I56-1436-00
EST MODULE
SOCKET
LED
LED
TEST
MAGNET
PAINTED
SURFACE
TEST
MAGNE
Figure 2. Views showing position of test magnet:
Sensors that fail these tests should be cleaned as described
under CLEANING and retested. If the sensors still fail these
tests they should be returned for repair.
CAUTION
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 enter-
ing the detector. Therefore, System Sensor recommends the
removal of detectors before beginning construction or other
dust producing activity.
Be sure to remove the dust covers from any sensors that
were left in place during construction as part of returning
the system to service.
Cleaning the Sensor
NOTE: Before cleaning, notify the proper authorities that
the smoke sensor system is undergoing mainte-
nance and will be temporarily out of service. Dis-
able 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.
To remove the cover, depress the three lock prongs on the
top of the cover and rotate it counterclockwise to remove
the cover and screen assembly. Remove the screen and
clean the cover and screen assembly. Remove the screen
and clean it (Figure 3). Use a vacuum cleaner to remove
dust from the sensing chamber. Cover removal tools
(CRT400) and replacement screens (RS14) are available
upon request.
After cleaning, snap the screen into the cover. Then place
the cover and screen assembly on the sensor and rotate it
clockwise until it is locked in place. Test the sensor.
Figure 3:
A78-1938-00
A78-1978-00