Maintaining Conditions Of Certificate Conformity; Mounting The Enclosure; Mounting Surfaces And Environment - GasTech D-Guard2 Operator's Manual

9.4.3

Maintaining Conditions of Certificate Conformity.

To maintain compliance with the conditions of certification, ensure a full serviceable life and avoid compromising
detector safe operation, it is essential to operate with great care when installing D-Guard
Failing to be vigilant as to the conditions surrounding the certification (Appendix G –Approvals) may significantly
compromise the integrity of the detector, system or operation, and the consequence could be fatal. The user
must ensure that any "Conditions of Safe Use" outlined in the certificate are met.
When handling the D-Guard
components, since this may compromise safety. D-Guard
construction have been taken into account when issuing its certificate of conformity.
Damage caused by mishandling or by connection to incompatible equipment could render inoperative, those
aspects of the design that product safety relies on.
In addition to those areas covered in sections 8.4.1 and 8.4.2, it is vital that cable glands are correctly sealed as
must be the front panel (lid) of the enclosure that is removed during installation.
In particular for Group I applications, the exclusion of coal-dust from inside the detector housing is essential.
This is assured by design and by the IP66/IP68 level of protection that D-Guard
glands or front face may lower or even remove this level of protection.
9.5.

Mounting the Enclosure

2
The D-Guard enclosure provides two mounting feet that are external to the enclosure. These are located to
the left and right of the instrument and can accommodate screw/bolt sizes up to M8.
9.5.1

Mounting Surfaces and Environment

The surface that the detectors are to be mounted to should be as flat as possible to provide stable, secure fixing.
If the mounting surfaces are uneven and mounting screws are over-tightened, it is possible to apply undesirable
stresses to the enclosure mounting points. Ingress rating may also be affected if the enclosure is deformed by
mounting to an uneven surface.
Do not mount the detector to a surface using adhesive materials as this will not allow easy removal if necessary.
Additionally, the use of adhesives on the enclosure will void the product warranty. Adhesive fumes may also
cause degradation to the gas sensing cell, leading to premature failure.
Ensure that any surface coverings such as paint do not emit vapours. Many paints can release VOC's (Volatile
Organic Compounds) that, if sufficient in concentration can react within the electro-chemical gas sensing cell.
This reaction can cause errors in reading, shorten the life of the cell or cause cell damage.
If the detectors are to be mounted into a newly built and painted area, it is strongly advised that paints be
allowed to dry thoroughly before installing the detectors.
2
during installation, great care must be taken to not damage any part of the system
19
2
is intrinsically safe by design and all aspects of the
2
has. Incorrectly tightened cable
2
D-Guard
2
.