39
3.3 Sensor replacement/servicing of detectors
Xgard
uses a modular design, which makes replacement of sensors
extremely simple.
Xgard
Type 4 uses a high temperature detector, which
must be replaced as a whole, complete with sensor retainer (see page
33).
A detailed view of
Xgard
Type 4 is given in Diagram 10.
The following procedure may be followed when servicing a
Xgard
Type 4.
WARNING
This work should be carried out by Crowcon or an approved
service centre unless suitable training has been received.
1. Switch off and isolate power to the detector requiring attention.
2. Open the junction box of the detector by unscrewing the lid in an anti
clockwise direction (having loosened the retaining grubscrew first).
3. Loosen the terminals retaining the detector wires.
4. Loosen the grubscrew on the sensor retainer.
5. Unscrew the detector and sensor retainer.
6. Fit the replacement detector and sensor retainer taking care to ensure
the wires do not become twisted. Ensure the new detector is securely
tightened.
7. Secure the sensor retainer grubscrew.
8. Reconnect the detector wires as shown in Diagram 10.
9. Follow the commissioning procedure given in 3.1.
Storage Instructions:
The sensor used in this detectors should be stored
in a dry environment, and protected from exposure to silicones,
sulphides, chlorines and lead. Exposure to these compounds will
significantly reduce the sensitivity of the sensor, and render the sensor
warranty void.
3. Operation
Xgard Type 4
