MEDC DB5M, Technical Manual

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English
1.0 INTRODUCTION
This range of light weight, intrinsically safe sounders has been designed with a high weatherproof rating
to cope with the harsh environmental conditions found offshore and onshore in the oil, gas and
petrochemical industries.
The unit is available in both 12Vdc and 24Vdc model
2.0 INSTALLATION
The sounder should be positioned using the two of the available fixing holes in the base. MEDC
recommend that stainless steel nuts and bolts be used, if the environment is corrosive.
The sounder will operate in any attitude - from horizontal to vertical. However, it is important to note that
the alignment of the Sounder should ensure that:-
1.
Dust or debris cannot lodge or settle in the cover apertures.
2.
Water from hoses, jets or rain cannot settle in the cover apertures. The sounder should be installed in
accordance with certified parameters.
This apparatus has been designed in accordance with IEC/EN60079-0 and IEC/EN60079-11, therefore
the apparatus has been designed to meet the fault tolerance requirements of Electrical Apparatus for
Category ‘ia’.
The installation and maintenance must be carried out in accordance with all appropriate international,
national and local standard codes of practice and site regulations for intrinsically safe apparatus and in
accordance with the instructions contained within this manual. Access to the circuitry must not be made
during operation.
The equipment must only be installed, operated and maintained by trained competent personnel. The
product must not be installed in a position where it may be attacked by aggressive substances.
The product must not be installed where it may be subjected to an excessive dust laden air flow that may
cause an electro-static build up.
2.1 Removing/replacing the cover:
Unscrew the locking screw on the side of the base. Remove the cover by turning it anti-clockwise and
pulling it gently away from the base. Replace the cover in a similar, but reverse, manner for that used for
removal.
Ensure the seal is fully located over the cover spigot prior to replacing the cover.
Once the cover has been replaced, ensure the locking screw is fully tightened. Do not over-tighten.
2.2
Cable Termination
Cable termination should be in accordance with specification applying to the application. MEDC
recommend that all cables and cores should be fully identified.
Ensure that only the correct glands are used and that the assembly is shrouded.
s (ATEX 12Vdc only)
© MEDC 2017 01/17