VESDA VLC-EX Product Guide
VESDA by Xtralis
34
www.xtralis.com
11.1 Opening and Closing the Detector
11.1.1 Opening the detector
Caution:
Before undertaking any work on a VLC-EX detector, which would involve opening the outer
stainless steel case, the area in which it is installed must be made safe, i.e. the atmosphere
must be confirmed to be free from potentially combustible gas. In addition, all site specific and
local rules and regulations must be followed with regard to obtaining permission to work on the
detector.
1. Undo the four screws on the stainless steel front cover.
2. Open the front cover and allow the cover to hang by the attached plastic straps.
3. Undo the two screws on the plastic front cover.
4. Open the front cover and allow it to hang on the attached plastic strap.
11.1.2 Closing the Detector
1. Replace the front cover ensuring that the plastic strap and the cable loom are not wedged between the
cover and the detector body.
2. Tighten the two screws.
3. Replace the stainless steel front cover ensuring that the plastic straps and the earth cable are not
wedged between the cover and the detector body.
4. Tighten the four screws.
Figure 11-1: Opening and closing a VESDA detector inside the VLC-EX enclosure
11.1.3 Replacing the Filter
1. In order that the VLC-EX recognises that the filter has been replaced, the unit needs to be powered up
during this maintenance operation, so that the microprocessor recognises the change.
2. Having the unit powered up is in conflict with the requirements of working in a potentially hazardous
atmosphere. Therefore, this maintenance task is only possible by obtaining a permit to work in the
potentially hazardous atmosphere, in accordance with the site rules for conducting such work.
3. It is important that steps are taken to ensure that the area is made safe and remains so throughout the
maintenance operation.
4. If it is not possible to power the unit up in the potentially hazardous area, the unit needs to be removed to
a safe area, where the unit can be powered and the filter changed.
Summary of Contents for VESDA VLC-500-EX
Page 2: ......
