Yokogawa digitalYEWFLO (DY) - Manual (Page 107)

IM 1F2B4-01-YIA
Page 102
TROUBLESHOOTING
6.5.4 Output is unstable when flowrate is low
YES
NO
Perform piping checkout
procedure, section 6.4.3.
Perform noise balance adjustment,
section 6.4.4.
Operation
Normal?
END
NO
YES
YES
NO
Is TP2-COM2
waveform unstable?
Confirm that vortex sensor
assembly mounting bolts
are properly torqued.
Check vortex
shedder for obstructions
Check meter sizing. Is
the flowrate within the
measurable range?
Resize meter
Waveform
superimposed with
60Hz noise?
YES
NO
END
Eliminate noise by grounding, or
using shielded wire. For remote meters
only, confirm that Yokogawa's
special signal cable (YF011) is used
and properly terminated.
Contact Yokogawa Industrial Automation
technical assistance, 800/524-7378.