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IM 1E7B0-02E
9-3
9. MAINTENANCE
(2) Unstable Zero
Insulation deterioration is suspected.
Examine the meter.
Examine whether or not the
flow tube is filled with liquid
and the liquid does not contain
bubbles.
Examine whether or not the
valves leak.
Recheck liquid property.
Replace valves.
Completely grounding
(grounding resistance must be
100
Ω
or less.)
Sufficiency shield the meter.
Locate the meter as far as
possible from this equipment.
NO
NO
YES
NO
YES
NO
NO
NO
YES
NO
YES
YES
YES
YES
It is convenient to provide a gas
vent hole on the downstream
side of the flow tube to check
for bubbles.
In particular, be careful for
horizontal mouting.
Change mounting position or
change to vertical mounting with
upward flow so that the flow tube
is completely filled with liquid.
Mount a deforming device on
the upstream side of the flow tube
• Confirm the flow tube grounding.
• Confirm whether or not the
grounding wire is disconnected
from the earth flange.
a,
Insure that the liquid
conductivity does not
change beyond fluid limits.
b,
Do not use the meter with
liquid conductivity below 5
µ
s / cm.
c,
Decrease flow velocity near
the conductivity low limit as
much as possible
•
Remove dirt and scale on
and near electrodes.
•
Change to vertical meter
mounting.
START
Is the flowmeter located
nearmortors, transformers,
or other electric
equipment?
NO
YES
Are valves leaking?
Is the flow tube filled with
liquid completely?
Are bubbles contained
in the liquid?
Is grounding complete?
Is the liquid likely to
cause deposit?
• Does the
fluid conductivity vary
or is it easy to change?
• Is Liquid conductivity sometimes
below 5
µ
s/cm?
*
*