DigitalFlow™ GF868 Programming Manual (1-Channel) 13
Chapter 1. Programming Site Data
1.8.4 Path Length
5. Press [F1] = inch or [F2] = feet to select the units. Then, enter the Path Length (P) of the ultrasonic signal. Press
[ENT]. (The meter will only accept values from 1/8 to 900 in.)
Note: The factory has calculated both the transducer signal path length (P) and the transducer signal axial length (L),
based on the exact transducer configuration used for the application. These values are engraved on the
flowcell and/or are included in the documentation supplied with the meter.
1.8.5 Axial Length
6. Press [F1] = inch or [F2] = feet to select the units.Then, enter the Axial Length (L) of the ultrasonic signal and press
[ENT].
Note: The factory has calculated both the transducer signal path length (P) and the transducer signal axial length (L),
based on the exact transducer configuration used for the application. These values are engraved on the
flowcell and/or are included in the documentation supplied with the meter.
1.8.6 Reynolds Correction
7. Press [F1] to turn Reynolds Correction off, or [F2] to turn it on.
Note: Reynolds Correction is a number based on the Kinematic Viscosity and flow rate of the fluid. It should be
enabled for most applications.
a. When you enable the Reynolds Correction Factor, you must also enter the Kinematic Viscosity of your gas, as
listed in Sound Speeds and Pipe Size Data. Use the numeric keys to enter a value, and press [ENT].
1.8.7 Calibration Factor
8. Enter a value for the flow Calibration Factor and press [ENT]. The default value is 1.00. (The meter will only accept
values between 0.50 and 2.00.)
1.8.7a Procedure Options
After completing the above steps, the meter returns to the User PROGRAM prompt. Continue as follows:
• To continue programming the meter, refer to the menu maps in Appendix A and navigate to the desired menu.
Then, proceed to the appropriate section of the manual for instructions.
• To leave the User Program and retain the previous settings, press [EXIT] and then press [F1] = NO at the SAVE
prompt. Any programming changes will be discarded and you will be returned to the data display.
• To leave the User Program and return to measurement mode, press [EXIT] and then press [F2] = YES at the SAVE
prompt. Your programming changes will be entered into the meter’s memory, and you will be returned to the data
display.
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