Installation; Installation Considerations - GasTech D-Guard2 Operator's Manual

9. INSTALLATION

9.1.

Installation Considerations

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The D-Guard Toxic Gas detector would generally be part of a larger system and be connected to other
components or equipment within it. These other pieces of equipment would generally provide the function of
signal acquisition, decision making, shutdown, control and indication (PLC's, fan controls, beacons, sirens, SCADA
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systems etc.). D-Guard can also be used as a standalone instrument as part of a 'mini system' using alarm type
devices connected directly to its relay terminals.
Whichever type of system D-Guard
number of things that need to be considered to prevent incorrect or unsafe operation of both the detector and
the system into which it is installed. Along with relevant competence, and an understanding of the target
application, the following points should be considered:-
Ensure that the information provided in sections 1 to 6 is fully understood.
It is extremely important that the limitations and restrictions for use of the detector are understood in order to
prevent the creation of hazardous situations and increased risk of dangerous events occurring . If in doubt as to
the nature of these limitations/restrictions, or their implication, consult a competent authority such as a
supervisor or Gastech applications engineer.
Ensure that the information in sections 11 to 19, plus Appendix A are understood.
It is extremely important that the functionality of the detector is fully understood in order to reduce the likelihood
of creating hazardous situations and risks due to a malfunctioning detector or gas monitoring system. If in doubt
as to the functionality of the detector, or the implications of incorrect use, consult a competent authority such as
a supervisor or Gastech applications engineer.
Ensure that the application into which the detector is to be installed is correctly understood.
Any system intended to mitigate the risk of injury needs to be properly designed and implemented. Such a system
must be the result of structured risk analysis with the outcomes used to help define the safety system
requirements. Such risk assessments will take into considerations the nature of the application along with its
processes and likely hazards. The safety system requirements, in turn, will guide the choice of instrumentation,
logic solvers and actuators needed to implement the system. Understanding the required functionality of the
system will ensure proper selection and safe deployment of equipment.
Ensure that the detector will properly perform the required functions within the system design.
It is important to understand how the detector will interact with other equipment within a system. For safe and
reliable use, it is crucial that neither the detector or other system components signalling be compromised by
incompatibilities between equipment.
Ensure that all equipment to be connected to D-Guard
Entity parameters are listed on the equipment certificate of compliance (a copy of which is contained in Appendix
H and also on the product identification plate. Check for any conditions of safe use.
Check the terminal parameters of all devices intended to be connected to the detector against its certificate of
conformance. Entity parameters are assigned to input and output connections of equipment and set the limits
for parameters such as input voltages, load capacitance etc.. It is essential for the sake of safety and compliance
to conditions of certification, that limits presented by entity parameters are not exceeded. If in doubt, consult a
competent authority, or contact an Gastech applications engineer.
It is critical that the certification type shown on the D-Guard
application into which it is being installed. Failure to adhere to this could create the risk of injury or loss of
life.
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is intended to be used in, before the detector can be installed, there are a
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have compatible entity parameters.
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identification plate is compatible with the
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D-Guard