BEKA BA374C, Руководство пользователя

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Any EEx ia IIC certified galvanic isolator with
output safety parameters equal to or less than the
following may be used:
Uo = 30V
Io = 280mA
Po = 0.85W
For guidance, System Certificate Ex96D2506 lists
some of the devices which may be used.. Fig 4
shows a typical loop.
Fig 4 Typical application using galvanic isolators
5. INSTALLATION
The BA374C indicating temperature transmitter
should only be installed and operated by trained
competent personnel.
5.1 Location
The BA374C indicating transmitter can be supplied
in either a glass reinforced polyester (GRP), or an
epoxy painted aluminium enclosure. Both provide
IP66 protection and have a toughened glass
window and stainless steel fittings. The GRP
enclosure is suitable for most industrial installa-
tions including off-shore and waste water treatment
applications. For installations where solvents may
be present, the aluminium enclosure provides
maximum protection. The instrument should not
be installed in a position where it may be attacked
by aggressive substances.
The instrument must be positioned such that the
environmental conditions specified by the instru-
ment datasheet and the EC-Type Examination
Certificate are not exceeded.
Please consult BEKA associates if the instrument
is to be installed in an area subject to high
vibration.
Fig 5 BA374C installation procedure
Both enclosures are surface mounting, but may be
pipe or panel mounted using the accessory kits
described in section 10.
To simplify installation, the enclosure may be
installed and the field wiring terminated prior to the
transmitter assembly being fitted. Terminal 7 is
internally connected to the screen in the GRP
enclosure and to the case in the aluminium
enclosure.
5.2 Installation Procedure
Fig 5 illustrates the instrument installation
procedure.
a. Remove the enclosure cover by unscrewing
the four captive 'A' screws.
b. Remove the transmitter assembly from the
enclosure by unscrewing the three captive 'B'
screws and unplugging the flexible cable(s).
c. Mount the enclosure on a flat surface and
secure with screws or bolts through the four
corner 'C' holes. Alternatively use one of the
pipe or panel mounting kits described in
section 9.
d. Remove the temporary dust seals from the
cable entries and install the required glands,
conduit fittings or blanking plugs.
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