Panametrics DigitalFlow GC868, Programming Manual, Page: 23 / 134

DigitalFlow™ GC868 Programming Manual (2-Channel) 1-12
Chapter 1. Programming Site Data
1.6.3.9 Number of
Traverses
11. Press [F1]-[F4] to select the desired
Number of Traverses
(times the ultrasonic
signal traverses the pipe, from 1 to 9).
Note:
Most clamp-on gas applications require a single traverse (1(Z)).
1.6.3.10 Transducer
Spacing
12. The Transducer Spacing prompt displays the spacing of the transducers, as
calculated from the information you have entered. Record this number in
Appendix B, Data Records , and use it to properly space the transducers.
Note:
If necessary, you can overwrite the spacing shown at the previous prompt
(using the numeric keys) to match the actual physical spacing of the
transducers. Panametrics does not recommend overwriting the spacing. If
you must, do not change the spacing by more than ±10% from the value
shown.
1.6.3.11 Procedure Options After completing the above steps, the meter returns to the Channel 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
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.
1.6.4 Setting Up
Inputs/Outputs
The following specific tasks may be performed via the I/O submenu:
• Enter a zero cutoff value to eliminate low flow reading fluctuations
• Set up any optional temperature and/or pressure inputs
Refer to the menu map in Figure A-2 on page A-2.
Note: Remember to record all programmed data in Appendix B, Data Records.
1. To enter the Channel PROGRAM menu, press [F1] or [F2] (depending on the
desired channel) at the User PROGRAM prompt.
2. To enter the I/O submenu, press [F4] at the Channel PROGRAM prompt.
1.6.4.1 Zero Cutoff 3. Enter the desired Zero Cutoff value and press the [ENT] key. A value of 0.1 ft/s
(0.03 m/s) is recommended, but values from 0–1 ft/s (0–0.3 m/s) are
acceptable.
1.6.4.2 Temperature Input 4. At the
Temperature Input
prompt, press [F1] to enter a constant temperature
value or press [Fx] to select the option card in Slot x that will supply the live
temperature input.
Note: Each slot that contains an option card with an analog input assigned to
TEMP
or an
RTD
input will appear on the option bar. If the process
temperature is stable, a fixed value may be used, but most applications
require a live temperature input.
5. Do one of the following:
• If you selected FIXED , enter the known fixed process temperature. Press [ENT] .
(The meter will only accept values from –148° to 662°F.)
• If you selected SLOT X ,
a.
Press
[F1]
to select input A or press
[F2]
to select input B.The inputs were labeled
during setup.
Note:
The set up of input A is used as an example. Identical procedures would be
used to set up input B.