Setting Up Inputs/Outputs - GE DigitalFlow GS868 Programming Manual

March 2008

Setting Up Inputs/Outputs

Entering the Zero Cutoff
Entering the Steam Input
Entering the Temperature
Input
1-16
The following specific tasks may be performed via the
•
Enter a zero cutoff value to eliminate low flow reading fluctuations
•
Set up fixed or live temperature and pressure inputs
•
Set up fixed or live steam quality input for mass flow calculations
While following the programming instructions, refer to the menu map
in Figure A-2 on page A-2 in Appendix A, Menu Maps. Remember to
record all programmed data in Appendix B, Data Records.
1. To enter the
I/O
submenu, press
prompt.
Near zero flow, the Model GS868's readings may fluctuate due to
small offsets caused by thermal drift or similar factors. To force a
zero reading when there is minimal flow, enter a zero cutoff value as
described below:
2. Enter the desired Zero Cutoff value and press the
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. The menu returns to the main I/O
prompt.
3. At the Assume Saturation prompt, press
temperature and pressure to determine the state of the steam, or
[F2]
press for the GS868 to assume the steam is saturated.
4. At the Steam Input Type prompt, press
[F2]
input, or to select a pressure input.
• TEMP
If you select , go to step 5.
•
PRESR
If you select
5. At the Temperature Input prompt, press
temperature value or press
that will supply the live temperature input.
Note: Each slot that contains an option card with an analog input
TEMP
assigned to
bar. If the process temperature is stable, a fixed value may be
used, but most applications require a live temperature input.
[F4] Channel PROGRAM
at the
[F1] = NO
[F1]
to select a temperature
, go to step 7 on the next page.
[F1]
to enter a constant
to select the option card in Slot x
[Fx]
RTD
or an input will appear on the option
Programming Site Data
I/O
submenu:
[ENT]
key. A
to use