GE General Electric Oxygen Equipment PT878 Manual De Usuario

Chapter 9. Diagnostics and Troubleshooting

206

Transport® Model PT878 Portable Liquid Flowmeter User’s Manual

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.

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 

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