GE DigitalFlow DF968, Service Manual

Page: 35 / 78

March 2008
3-2 Diagnostics
Displaying Diagnostic
Parameters (cont.)
For example, pressing
[F1]
displays the
Tdown
parameter, as shown in
the following prompt.
Table 3-1 below lists the available diagnostic parameters for the
Model DF868. 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.
(Ch1) label gSITE
‰ Press the [
←]
and [
→]
keys and
the appropriate
[Fx]
key to
display a different diagnostic
parameter or to
EXIT
the
Diagnostics Menu .
Ch1 DN Transit usec
519.7
(error codes appear here)
Tdown DELTA PEAK% Qup
Table 3-1: Available Diagnostic Parameters
Option Bar Screen Display Description Good Bad
SS up UP Sig Strength Displays the signal strength for the
upstream transducer. 50–75 <50 or >75
SS do DN Sig Strength Displays the signal strength for the
downstream transducer. 50–75 <50 or >75
SNDSP Soundspeed Ft/s Displays the measured sound speed of
the fluid. N.A. N.A.
Tup UP Transit S usec Displays the upstream transit time of
the ultrasonic signal in microseconds. N.A. N.A.
Tdown DN Transit usec Displays downstream transit time of
the ultrasonic signal in microseconds. N.A. N.A.
DELTA DeltaT usec Displays the difference in µsec
between upstream and downstream
transit times. N.A. >10,000
nsec
REYN# Reynolds # A number based on the kinematic
viscosity and flow rate of the fluid. N.A. N.A.
K(RE) K(RE) K factor, based on Reynolds number N.A. N.A.
PEAK% PEAK% Displays the percentage of peak
(set to +50 by default). N.A. N.A.
THETA Theta 3 degrees Theta 3 is the angle between the
ultrasonic beam and the normal to
pipe wall. It is calculated from the
measured transit time and clamp-on
parameters (clamp-ons only). N.A. N.A.
Qup UP Signal Q Displays the signal quality for the
upstream transducer. Š 1200 –400 to +400
Qdown DN Signal Q Displays the signal quality for the
downstream transducer. Š 1200 –400 to +400