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Chapter 1. Programming Site Data
14
DigitalFlow™ GF868 Programming Manual (2-Channel)
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 12 on page 88.
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.
1.6.4a 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.
1.6.4b Temperature Input
Note:
This option appears only if you have selected
Standard
as the equation type in the
SYSTM
submenu, as shown on
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 accept values only
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.
b.
Enter the
Base Temperature
(from –148 ° to 662 °F), and press
[ENT]
. The ratio of this value to the actual
temperature is used to calculate the standard volumetric flow.
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