GE DigitalFlow DF868 Service Manual

Chapter 3. Diagnostics
22 DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual
3.2 Displaying Diagnostic Parameters (cont.)
For example, pressing [F1] displays the Tdown parameter, as shown in the following prompt.
Table 3 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 SITE  Press the [] or [] 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: Available Diagnostic Parameters
Option Bar Screen Display Description Good Bad
SS up UP Sig Strength Displays signal strength for the upstream transducer. 50–75 <50 or >75
SS do DN Sig Strength Displays 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 signal quality for the downstream transducer. Š 1200 –400 to +400
AMPup UP Amp Discrim Displays the value for the amplitude discriminator of
upstream transducer.
24 ± 5 <19 or >29
AMPdn DN Amp Discrim Displays the value for the amplitude discriminator of the
downstream transducer.
24 ± 5 <19 or >29
CNTup Counts up Displays automatic gain control setting for the
upstream signal.
N.A. N.A.

GE DigitalFlow DF868 Specifications

General

Brand	GE
Model	DigitalFlow DF868
Category	Measuring Instruments
Language	English