Chapter 1. Programming Site Data
28 DigitalFlow™ GF868 Programming Manual (1-Channel)
1.10.4 Setting Advanced Parameters (cont.)
1.10.4b Edit K Factors
1. Press [F2] = MULTK to enter the MultiK option.
2. Press [F1] = NO to disable or [F2] = YES to enable Multiple K-factors.
• If you press NO, the GF868 returns to the Advanced Features prompt.
• If you press YES, complete the steps below.
a. The GF868 asks for the type of K factor. Press
[F1] to select CstV (Custom velocity) or [F2] to select CstR
(Custom Reynolds number).
• If you enable CstR, 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].
b. Press
[F1] = NO to retain the current K-factor table and return to the Advanced Features prompt, or press [F2] =
YES to Edit The K-factor Table.
Note: If velocity vs. K-factor data was not provided with the Model GF868, the K-factor table can not be edited.
c. Enter the Number of K-factors to be entered into the table. Press [ENT]. (The meter will only accept values from
2 to 20.)
IMPORTANT: When editing the K-factor table, the velocities must be entered in increasing order.
d. Enter the Velocity (or Reynolds) Value for K-factor number “x”. Press [ENT]. (The meter will only accept values
from –30,000 to +30,000 ft/sec.)
e. Enter the K-factor corresponding to velocity number “x”. Press [ENT].
3. Repeat steps c and d until all of the data points have been entered.
1.10.4c Procedure Options
After completing the above steps, the meter returns to the Advanced Features 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 this manual for instructions.
• To leave the User Program and retain the previous settings, press [EXIT] twice 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] twice 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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