Yokogawa digitalYEWFLO (DY) - Manual (Page 106)

TROUBLESHOOTING
IM 1F2B4-01-YIA
Page 101
6.5.3 Large flowmeter errors
Are power supply
voltage and load
resistance correct?
Do parameter settings agree
with process conditions?
END
Does TP2
waveform contain
60Hz noise?
END
Correct power supply
voltage and load
Correct parameter settings
Correct parameter setting
or process conditions
END
No
No
Recheck meter sizing.
Confirm that flow rate
is betwen Qmin and Qmax.
Yes
Yes
END
Are Reynolds number,
temperature and pressure in
operating range.
(note)
Is TP2-COM2 waveform
normal? Figure 6.4.1.
YES
NO
YES
YES
NO
NO
YES
NO
END
END
Perform piping checkout procedure,
section 6.4.3. Correct as required.
Operating
Normal
Check calibration
standards
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.