GE DigitalFlow GC868 Service Manual page 34

April 2008
Displaying Diagnostic
Parameters (cont.)
Option
Bar Screen Display
SS up UP Sig Strength
SS do DN Sig Strength
SNDSP Soundspeed Ft/s
Tup UP Transit S usec
Tdown DN Transit usec
DELTA DeltaT usec
REYN# Reynolds #
Tot K K(Re) MultiK*KFactor
PEAK% PEAK%
Qup UP Signal Q
Qdown DN Signal Q
AMPup UP Amp Discrim
AMPdn DN Amp Discrim
CNTup UP DAC Counts
CNTdn DN DAC Counts
P#up UP +- Peak
P#dn DN +- Peak
TEMP Temperature deg F
PRES Pressure psia
3-2
Table 3-1 below lists the available diagnostic parameters for the
Model GC868. The first column in the table shows the parameter as it
appears on the option bar, while the second column shows the
parameter as it appears in the prompt area after it has been selected.
Table 3-1: Available Diagnostic Parameters
Description
Displays the signal strength for the
upstream transducer.
Displays the signal strength for the
downstream transducer.
Displays the measured sound speed
of the fluid.
Displays upstream transit time of the
ultrasonic signal in microseconds.
Displays downstream transit time of
ultrasonic signal in microseconds.
Displays the difference in µsec
between upstream and downstream
transit times.
Displays the Reynolds number.
Displays the combination of all K
factors.
Displays the percentage of peak
(set to +80 by default).
Displays the signal quality for the
upstream transducer.
Displays the signal quality for the
downstream transducer.
Displays the value for the upstream
transducer amplitude discriminator.
Displays the value for the down-
stream amplitude discriminator.
Displays the AGC DAC count for
upstream gain setting.
Displays the AGC DAC count for
downstream gain setting.
Displays signal peaks for the
upstream transducer.
Displays signal peaks for the
downstream transducer.
Displays the gas temperature
(0/4-20 mA or RTD input).
Displays the gas pressure
(0/4-20 mA or RTD input).
Good Bad
58–68 <58 or >68
58–68 <58 or >68
N.A. N.A.
N.A. N.A.
N.A. N.A.
N.A. >30 nsec
<100,000,000 N.A.
N.A. N.A.
N.A. N.A.
Š 1,200 –400 to +400
Š 1,200 –400 to +400
24 ± 5 <19 or >29
24 ± 5 <19 or >29
N.A. N.A.
N.A. N.A.
100-2,300 <100 or >2,300
100-2,300 <100 or >2,300
N.A. N.A.
N.A. N.A.
Diagnostics