Options board (Optional)
The options board comprises of a TWA alarm relay, PC connection port and an
isolated repeat 4..20mA output. The option board connects to SK6 and SK9. The field
terminals associated with the TWA relay and repeat 4.20mA output are mounted on
the main circuit board.
Enclosure
The enclosure is a custom design. The back box of the enclosure contains all of the
electronic circuit boards, batteries (if fitted) and galvanic isolator (if fitted). A
separate metal cable gland earth plate is available should metal cable glands be used.
The enclosure has three mounting points; one top centre and two at the bottom
corners. All mounting points are non-intrusive to maintain the enclosure rating of
IP65.
The lid of the enclosure is fixed to the back box by six bolts. A special tool is required
to loosen these fixing bolts
A plastic cradle is available to house a galvanic isolator (Stahl 9303) within the
general enclosure. This cradle creates a separate enclosure within the general
enclosure to separate the safe and hazardous terminals of the galvanic isolator.
Installation
Unpacking
There are no special precautions to be taken when unpacking the control unit from the
carton. Care should be taken not to discard the Installation and Operating manual,
which is packed in the carton.
All packing materials should be re-cycled if possible.
Mounting
The control unit should not be mounted in the following environments
Hazardous areas (without additional protection)
Surfaces with excess vibration
Environments containing aggressive and corrosive atmospheres
Inaccessible areas
The control unit can be mounted directly onto the wall or any suitable robust surface.
The three-point mounting allows the control unit to be mounted on an irregular
surface without the enclosure being distorted.
The mounting hole dimensions are detailed in Appendix A.
Issue 4 03/09/04
6 of 29
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