![YOKOGAWA AE100D Instruction Manual Download Page 110](http://html.mh-extra.com/html/yokogawa/ae100d/ae100d_instruction-manual_911083110.webp)
IM 1E7B0-02E
9-4
9. MAINTENANCE
(3) Disagreement of Indication with Actual Flow Result
NO
NO
YES
NO
NO
YES
YES
YES
NO
YES
YES
NO
YES
Examine liquid filling in the flow tube, bubbles present, and grounding status.
Adjust zero when the flow tube is
completely filled with liquid and the
velocity is zero.
Recheck the liquid property.
Change the mounting position or piping so
that the flow tube is completely filled with
liquid.
Provide a defoaming device on the
upstream side of the flow tube.
Complete grounding
(grounding resistance must be
100
Ω
or less).
Completely perform end-treatment of the signal
cable with PVC tubes or insulation tape so that
the conductors, inner shields, and outer shield
do not contact each other or with the case.
a. Remove scales. Especially clean the
electrodes and their vincinity.
b. Remove scales with a soft brush or a piece
of soft cloth. Never claw or scratch the
lining.
NO
YES
a. If a valve located immidiately upstream of
the meter is used half opened, the
indication may be affected with flow
turbulency.
b. Move the valve downstream of the meter.
c. If the valve must be located on the
upstream side, allow for a minimum
distance to the meter of 10 times the meter
diameter or use the valve fully open.
Examine whether or not a valve
exists immidiately before the
meter (on the upstream side).
NO
Set the parameters correctly.
Are parameters correctly set?
Is zero adjustment
correctly done?
Is the flow tube completely
filled with liquid?
Does the liquid contain bubbles?
Is grounding complete?
Is the signal cable completely
end-treated?
Is the liquid likely to cause
deposits?
Is a valve located immidiately
upstream of the meter?
START
Contact your agent or the nearest
YOKOGAWA sales office.
Check the operation with the
AM012 calibrator, and you'll
be able to confirm the error of
the converter or of Flow Tube.