GasTech D-Guard2, Operator'S Manual, Page: 56 / 77

D-Guard
2
53
17. Detector Maintenance
Under normal operating conditions, D-Guard
2
requires minimal maintenance above any scheduled service as set by
local site regulations.
17.1. Visual Inspection
Basic visual inspection focuses on looking at the physical installation for signs of damage, water or dust ingress and the
condition of cables and labels. Visual inspections may include the need to open cabinets to gain access to some parts
of the system. This type of inspection also includes cleaning the fascia and labels that have become obscured by dirt.
NOTE: The detector’s fascia panel must only be cleaned using antistatic compatible cleaning materials. Do
not clean the detector with cleaning products that may create a build-up of static electricity.
During a Visual Inspection, typical observations would include:-

Check that gas inlet ports are not obstructed by dirt or moisture.

Check that connected cables are intact and free from cuts, abrasions and obvious signs of damage.
Verify that cable restraints, including cable glands are in serviceable condition and correctly fitted.

Check system equipment enclosures, cable trays, conduits, wall-boxes etc. for good condition with
no signs of physical damage. Verify that sealed cabinets are free from water or contaminant ingress.
Check that door seals are in good condition.

Verify that labels fixed to equipment such as enclosures, wall boxes and cables are present and in
good condition allowing clear visibility of the information and identification they convey (especially
certification labels).

Verify that no unauthorised modifications have been carried out on equipment.
17.2. Hands-On (Detailed) Inspections
More detailed inspections would include all of the aspects of visual inspection with additional checks that cover the
verification of the integrity of connections, fixtures and fittings. Hands-on inspection may include the use of tools.
Addition to basic visual observations, hands-on checks would typically involve:-

Ensure that the gas inlet port waterproof membranes are intact by removal of the gas port
splashguard.

Check the inside of D-Guard
2
enclosure for signs of moisture or contaminant ingress.

Verify that the detector enclosure lid seal is in good condition.

Re-fit D-Guard
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enclosure lid and properly tighten all fixing screws. Verify screw heads are not
damaged.

Verify that equipment housings, wall boxes and other mechanical fittings are secured properly.
Verify the proper fitting of lids for terminal boxes, the tightness of cable glands and the integrity of
wall-box mountings, DIN rails etc.

Verify that all electrical connections are secure with no loose screw terminals.

Verify that DIN rail mounted terminals are firmly secured fitted to their rails.