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11.2 Components Replacement
IMPORTANT
In case of explosion proof type, component
replacement by other than authorized
representative of Yokogawa is prohibited and
will void the certification. If necessary, contact
Yokogawa.
WARNING
• Component replacement must be carried out
by the trained personnel having knowledge
of safety standard. No operator shall be
permitted to perform any operations relating
to component replacement.
• Component replacement and the associated
operations must be carried out by expert
engineer or skilled personnel and not by
operators.
• Before opening the cover, it is important to
ensure that at least 5 minutes have passed
since the power was turned off. Furthermore,
opening of the cover must also be carried out
by expert engineer or skilled personnel.
IMPORTANT
• As a rule, maintenance of this flowmeter
should be implemented in a maintenance
service shop where the necessary tools are
provided.
• The amplifier assembly contains sensitive
parts that may be damaged by static
electricity.
Excercise care so as not to directly touch
the electronic parts or circuit patterns on
the board, for example, by preventing static
electrification by using grounded wrist
straps when handing the assembly. Also
take precautions such as placing a removed
amplifier assembly into a bag with an
antistatic coating.
<11. MAINTENANCE>
11.2.1 Display Unit Replacement
CAUTION
When using this instrument for a long time in
conditions of high temperature and humidity, the
visibility of the display unit may deteriorate. In
this case, it is necessary to replace the display
unit.
(1) Removing the Cover
(1) Turn off the power.
(2) The cover has the locking screws in front and
behind it as shown in Figure 11.2.1 in case of
explosion proof type. This is used for the cover-
locking system. Loosen cover locking screws
clockwise using a hexagonal wrench (nominal
size 3) to unlock the cover. (Upon shipment
from the manufacturing plant, the cover is
locked.)
Hold the flowmeter with your hand and remove
the cover by turning it in the direction of the
arrow as shown below (both explosion proof
and general purpose types).
Front
side
(1)
(2)
Cover locking
screws
Explosion proof type
Figure 11.2.1 Removing the Display Cover
(2) Removing the Dispaly Unit
(1) Hold the display unit with your hand and loosen
the four mounting screws. Remove the display
unit by pulling it in a straight, taking care not to
damage it (Read Figure 11.2.2).
11-2
Both Explosion proof and
General purpose types
F1103.ai
IM 01E30D01-01EN
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