Operation Manual

8-14
IM 1F5B2-01E
■ The flowrate reading fluctuates.
START
Contact Yokogawa’s
service personnel.
Is the flowrate
reading close to its
lower limit?
Is the output signal
at terminal P stable?
TP2: Is the voltage low?
YES
NO
Replace the
batteries.
Does the supply voltage
signal contain ripples?
Are the terminals and cables
properly connected?
NO
Replace the
amplifier unit.
Replace the
sensor
assembly.
Remedy the
improper
connection.
YES
YES
NO
Lower the
trigger level.
YES
NO
The fluctuation may be due
to the cut-off-low-flowrate
feature. Turn up the flow of
fluid.
NO
(Very high)
YES
Around 450 mVp-p
Check the piping conditions:
• Straight lengths of pipeline (page 4-1)
• Bubbles of gas (page 4-3)
• Protrusion of gaskets (page 4-4)
• Loose piping connections
The reading
fluctuates.
The output circuit
of the amplifier
assembly is faulty.
The reading
fluctuates.
The reading
fluctuates.
The reading fluctuates.