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Chapter 9. Diagnostics and Troubleshooting
206 Transport® Model PT878 Portable Liquid Flowmeter User’s Manual
9.2 Displaying Diagnostic Parameters
As part of its measurement menu, the PT878 offers a list of diagnostic
parameters to aid in troubleshooting in the event of flowcell, transducer, or
electrical problems. You can select any diagnostic parameter for display as a
measurement as discussed in Chapter 5, Displaying and Configuring Data,
on page 95. Table 8 below shows all the available diagnostic parameters
and ranges.
Table 8: Diagnostic Parameters
Diagnostic
Parameter Displays Good Bad
DT Displays Delta T, or the difference between
the upstream and downstream transit
times.
N/A Continuous
large fluctu-
ations of 1
ms or more.
Amplitude
Up
Displays the value for the amplitude dis-
criminator of the upstream transducer.
20-28 <20 or >28
Amplitude
Down
Displays the value for the amplitude dis-
criminator of the downstream transducer.
20-28
fluctuations
< 20 or > 28
fluctuations
T Up Displays the upstream transit time of the
ultrasonic signal in micro seconds.
N/A N/A
T Down Displays the downstream transit time of
the ultrasonic signal in micro seconds.
N/A N/A
Gain/Up Displays upstream gain in dB. N/A N/A
Gain/Dn Displays downstream gain in dB. N/A N/A
Soundspeed
(m/s or f/s)
Displays the measured soundspeed of the
fluid.
Check the soundspeed of
fluid in Soundspeeds and
Pipe Size Data.
P#up Displays signal peaks for the upstream
transducer.
100-900 <100, >900
P#dn Displays signal peaks for the downstream
transducer.
100-900 <100, >900
Reynolds # Displays the Reynolds Number. N/A N/A
K(RE) Displays the K Factor, based on the
Reynolds Number.
N/A N/A
Raw Up Displays raw upstream signal. N/A N/A
Raw Down Displays raw downstream signal. N/A N/A