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Flow Rate Indication Is Not Stable - Toshiba LF414 Instruction Manual

Electromagnetic flowmeter detector
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7.2.3 Flow rate indication is not stable

Is power supply voltage
within the specified range?
Are cables securely connected?
Is the flowmeter grounded
with 100Ωor less ground
resistance?
Is the detector pipe filled
with fluid?
Is the fluid carrying bubbles?
Is there high-voltage or large
current cable or equipment
near the flowmeter?
Contact your nearest Toshiba
representative.
START
YES
YES
YES
YES
NO
NO
NO
Use a power supply within the
specified range.
Connect each cable securely to the
NO
terminal board.
Ground the flowmeter with a copper
braid or wire(5.5 mm² minimum) to a
NO
good earth ground
(100
Ω
NO
Design piping so that the detector
pipe is filled with fluid all the time.
Design piping so that the fluid does
YES
not carry bubbles.
Install the flowmeter away from
YES
equipment producing electromagnetic
or electro- static interference.
Note 1: If the detector tube is not filled with
operating fluid, the flow is indefinite and
measurement is impossible. Be sure to fill
the detector tube with operating fluid
before starting measurement.
- 42 -
6F8A0870
.
or less ground resistance)

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