Toshiba LF664 Instruction Manual page 37

7.2.3 Flow rate indication is not stable
START
Is power supply voltage
within the specified range?
YES
Are cables securely connected?
YES
Is the flowmeter grounded
with 100Ωor less ground
resistance?
YES
Is the detector pipe filled with
fluid?
YES
Is the fluid carrying bubbles?
Is there high-voltage or large
current cable or equipment
near the flowmeter?
Contact your nearest Toshiba
representative.
NO
NO
NO
NO
YES
NO
YES
NO
—
Use a power supply within the
specified range.
Connect each cable securely to the
terminal board.
Ground the flowmeter with a copper
braid or wire(5.5 mm² minimum) to a
good earth ground
(100ohm or less ground resistance)
Design piping so that the detector
pipe is filled with fluid all the time.
Design piping so that the fluid does
not carry bubbles.
Install the flowmeter away from
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.
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