YOKOGAWA DO72, Инструкция по эксплуатации

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5.1 DO72 optical DO sensor
grounding
The DO72 dissolved oxygen optical
sensor housing is made of stainless
steel with high corrosion resistance
(SUS 316 L).
However, electric potential differ -
ences between the DO72 and a tank
or other peripherals in the tank can
cause immediate corrosion through
electrolysis. Therefore, please
ensure to avoid electric potential
differences between DO72 and the
surrounding environment.
We recommend always to connect
the DO72 to the protective ground
at the installation site. Assign the
device housing and cable shield to
protective ground.
Especially the length of the cable
can influence the ground connec -
tion quality.
If the DO72 is installed in a fitting,
which is connected to the protective
ground, then the connection to the
ground will be established via the
PG 13.5 stainless steel fitting (see
Fig. 11).
If the DO72 is installed in a tank
which is NOT connected to the
protective ground (e.g. fitting made
of plastic or glass), a ground con-
nection should be attached to the
DO72 PG 13.5 fitting (see Fig. 12).
You can use a grounding clamp to
connect the DO72 directly to protec-
tive ground (see Fig. 13 for exam-
ple).
Fig. 11: DO72 grounding when installed
in a tank which is connected to protective
ground
Fig. 12: DO72 grounding when installed in
a tank which is NOT connected to protective
ground
Fig. 13: Example for a grounding clamp
that can be used for connecting an DO72 to
protective ground, when installed in a tank
without grounding.
PG13.5
Stainless steel thread
VP cable
shield
Green /
yellow
cable
IM12J06J02-00EN-P
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