GE PT878GC Manual De Usuario

April 2004

As part of its measurement menu, the PT878GC 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 6 on pages 6-7 and 6-8. Table 10-2 below shows all 
the available diagnostic parameters and ranges.

∆T

Displays Delta T, or the differ-
ence between the upstream 
and downstream transit times.

N/A

Continuous 
large fluctu-
ations of 1 
micro sec-
ond or 
more.

Amplitude Up

Displays the value for the 
amplitude discriminator of the 
upstream transducer.

20-28

<20 or > 28.

Amplitude 

Down

Displays the value for the 
amplitude discriminator of the 
downstream transducer.

20-28 
fluctua-
tions

< 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 tran-
sit 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

CNTup

Displays the AGC DAC count 
for upstream gain setting.

N.A.

N.A.

CNTdn

Displays the AGC DAC count 
for downstream gain setting.

N.A.

N.A.

Soundspeed

(m/s or f/s)

Displays the measured sound 
speed of the fluid.

Check the sound speed 
of fluid in Sound Speeds 
and Pipe Size Data.