Yokogawa ADMAG CA - Manual (Page 75)

IM 1E8B0-01E
9-5
9. MAINTENANCE
9.3.3 Disagreement of Indication with Actual Flow Result
NO
NO
NO
YES
NO
NO
CONTINUE
YES
YES
YES
NO
YES
YES
NO
YES
Set the parameters correctly.
Examine liquid filling in the meter tube, bubbles present, and grounding status.
Adjust zero when the meter tube is
compleltely filled with liquid and is
standing still.
Recheck the liquid property.
• Change the meter mounting position or
piping so that the meter tube is completely
filled with liquid.
• Mount the meter vertically with upward flow.
Provide a defoaming device on
the upstream side of the meter.
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 rhe
meter (on the upstream side).
START
Are parameters correctly set?
Is zero adjustment
correctly done?
Is the meter 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?