System-sensor 1551B Plug-in Intelligent User Manual download pdf (Page 3)

D500-40-00 3 I56-1436-00

EST MODULE

SOCKET

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

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System-sensor 1551B Plug-in Intelligent User Manual Page 3

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