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5.3 Replacement of parts
If the transmitter requires a replacement part, drain process fluid from the transmitter,
disconnect it from the process and carry out replacement in an instrument room.
Replace the transmission unit with a spare one in order to determine whether it is the
detecting unit or transmission unit which is faulty.
When the faulty unit is identified, it should be replaced with a new one.
Indicator
Connection at rear
of electronics unit
Electronics unit
Replacing procedure
(1) Turn off the power supply.
(2) Remove the indicator.
(3) Remove the electronics unit.
Unplug each connector.
(4) Remove the stud bolts which fastens
the indicator.
(5) Replace the electronics unit with a
new one and assemble it by
reversing the above procedure from
(4) to (1).
When installing the electronics unit, make sure that the
zero adjust screw and the volume control are posi-
tioned as shown the right.
Important
Zero/span
adjustment screw
Volume control
DANGER
When removing an explosion-proof transmitter, turn OFF the main power, then dis-
connect the piping and wiring. Do not remove it when the power is ON to prevent
serious accident such as explosion, fire, etc.
To identify faulty part
Replacement of electronics unit
Important
The electronics unit should be removed carefully so as not to damage the internal
wiring.
(6) After completion of replacement, perform zero and span adjustments.