Toshiba LF414 - Manual (Page 43)

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