0970 0043 Ex Documentation VA 450/452 English, V1.4, 05.11.12
0970 0043 Ex Documentation VA 450/452 English, V1.4, 05.11.12
EX Documentation VA 450/452
EX Documentation VA 450/452
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To all terminals of the flow transmitter, only devices with ratings Um
≤
24 V DC and Im
≤
500 mA are allowed to be connected.
The flow transmitter is only allowed to be used in the permitted tem-
perature class.
For ambient temperatures below –20 °C cables, drain plugs, cable
glands and cable entries must be suitable and certified.
Cables and pipe entries must be certified (Ex d IIC) and must be
suitable for operating temperatures of up to 105 °C . When using pipe
entries, the associated sealing equipment must be fitted directly at
the housing.
The cable entries and openings not used must be sealed tight with
suitable components.
The rotation of the display is only allowed during installation and in
non explosive environment! Before rotating the local display make
sure that the device is powered off for at least 5 minutes.
The display version of VA 452 can be rotated in both directions
270° . For this purpose the nut at the top of the s haft has to be
opened fully. Then pull up the metal casing and rotate it in the de-
sired direction. It can be rotated in 90° steps in both directions
.
A
metal pin locks the position. When the desired position is achieved,
press down the metal casing onto the shaft so that the metal pin can
insert into the position hole. Tighten up the nut.
Important
notes
2. Installation
Examination
certificate,
certificates of
conformity
The system meets the fundamental health and safety requirements
for the design and construction of devices and protective systems
intended for use in potentially explosive atmospheres in accordance
with appendix II of directive 94/9/EC.
Other tech-
nical infor-
mation
Since this manual only contains ex-relevant information please refer
to the instruction manual of VA 450 and VA 452 for technical data
and further information.
Front and
back cover
security seal
The front and back cover of the instrument are secured with a screw
to avoid the opening of the covers through unauthorized persons.
Please ensure that both security screws are tighten up after finishing
the installation!
Security screws at back and front cover
Used
standards
EN 60079-0:2009
EN 60079-1:2007
