Unstable Zero - YOKOGAWA ADMAG AXR User Manual

11.7.2 Unstable Zero

START
Investigate whether or not the
flowtube is filled with fluid and that it
is free of bubbles.
*1
Is the flowtube
completely full of fluid?
YES
Are there bubbles
in the fluid?
NO
Check for the presence of valve
leakage.
Are valves leaking?
NO
● Confirm the flowmeter grounding.
● Confirm whether or not the
grounding wire is disconnected
from the earth flange.
Is the flowmeter properly
grounded?
YES
Recheck the fluid to be measured.
● Does the fluid's
conductivity vary?
● Is the fluid conductivity
within the limits?
NO
Is the fluid likely to
contain deposits?
NO
Is the flowmeter
located near motors, transformers,
inverters, or electric
equipment?
NO
Contact a service center.
*1: When checking for bubbles, it is
convenient if there is a gas vent hole
on the flowtube's downstream side.
Particular care must be taken in the case
of horizontal mounting. In order to ensure
NO
complete filling of the tube, either adjust
the mounting position or switch to vertical
mounting.
YES
Install a defoaming device on the
flowtube's upstream side.
YES
Replace the valve(s).
NO Completely ground the flowmeter
(Read Section 4.4.)
● Ensure that the fluid's conductivity
changes as little as possible.
● Do not use the meter when fluid
YES
conductivity is out of limits.
● Whenever possible, reduce the flow
velocity to being in the vicinity of the
lower conductivity limit.
● Remove dirt and scale of and near
electrodes.
YES
● Use a soft brush or cloth to perform
scale removal, and make sure that
the lining is not damaged.
Provide the meter with sufficient
YES
shielding or move it away from the
electrical equipment
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