Displaying Diagnostic Parameters - GE TransPort PT878 User Manual

Chapter 9. Diagnostics and Troubleshooting

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.
Diagnostic
Parameter
DT Displays Delta T, or the difference between
the upstream and downstream transit
times.
Amplitude Displays the value for the amplitude dis-
Up criminator of the upstream transducer.
Amplitude Displays the value for the amplitude dis-
Down criminator of the downstream transducer.
T Up Displays the upstream transit time of the
ultrasonic signal in micro seconds.
T Down Displays the downstream transit time of
the ultrasonic signal in micro seconds.
Gain/Up Displays upstream gain in dB.
Gain/Dn Displays downstream gain in dB.
Displays the measured soundspeed of the
Soundspeed
(m/s or f/s)
fluid.
P#up Displays signal peaks for the upstream
transducer.
P#dn Displays signal peaks for the downstream
transducer.
Reynolds # Displays the Reynolds Number.
K(RE) Displays the K Factor, based on the
Reynolds Number.
Raw Up Displays raw upstream signal.
Raw Down Displays raw downstream signal.
206
Table 8: Diagnostic Parameters
Displays
Transport® Model PT878 Portable Liquid Flowmeter User's Manual
Good Bad
N/A Continuous
large fluctu-
ations of 1
ms or more.
20-28 <20 or >28
20-28 < 20 or > 28
fluctuations fluctuations
N/A
N/A
N/A
N/A
Check the soundspeed of
fluid in Soundspeeds and
Pipe Size Data.
100-900 <100, >900
100-900 <100, >900
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A