Baker Hughes DigitalFlow XGF868i, Programming Manual

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C.5.4 Entering input/output parameters
Enter the zero cutoff value and set up the temperature,
pressure and quality inputs via the input/output submenu.
While programming these parameters, refer to Figure 55 on
page 80 of Appendix D, PanaView menu maps .
IMPORTANT
If an option card in slot 1 fails to appear in this menu, it
may be turned OFF. See Setting up inputs and outputs on
page 65 (global-I/O-options ) for setup instructions.
C.5.4a Zero cutoff value
Near a zero flow rate, the XGF868i readings may fluctuate
due to small offsets caused by thermal drift or similar
factors. To force a zero display reading when there is
minimal flow, enter a zero cutoff value as described in
the following steps:
1. From the channel menu, highlight and double-click
on the input/output option in the center pane.
2. The program asks for the zero cutoff . Enter a value
from 0 to 1 ft/sec (0 to 0.30 m/sec) for the zero cutoff
and click [next item]. The recommended setting is
0.1 ft/sec (0.03 m/sec).
C.5.4b Temperature input
The XGF868i can use either a fixed temperature value
or a live temperature input to calculate the density for
the mass flow rate display.
1. Double-click on a
fixed temperature value or to
set up the option card in slot 1 that will supply the
live temperature input and press [next item].
NOTE: If slot 1 contains an activated option card with an
analog input assigned to temperature or an RTD input,
slot 1 appears as an option at the above prompt. If the
process temperature is stable, a fixed value may be used,
but most applications require a live temperature input. If
there is no active option card for temperature, the meter
assumes you are using a fixed temperature.
2. Proceed to one of the following sections:
• If you selected fixed - proceed to step 3.
• If you selected slot 1 - proceed to step 4.
3. Enter the known fixed temp. (process temperature)
and click [next item]. The meter will accept values
from –328 to 1832°F (–200 to 1000oC). Proceed to
base temperature on the next page.
4. Select input A or input B and click [next item]. 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.
C.5.4c Base temperature
1. Enter the base temperature and click [next item].
The ratio of this value to the actual temperature is
used to calculate the standard mass flow rate.
2. Do one of the following:
• If you selected pressure as the input type,
proceed to pressure input below.
• If you selected temperature as the input type,
proceed to base pressure below.
C.5.4d Pressure input
1. Double-click on a fixed pressure value or to set up
the option card in slot 1 that will supply the live
pressure input.
NOTE: If slot 1 contains an activated option card with
an input assigned to pressure, slot 1 appears as an
option at the above prompt. If the process pressure is
stable, a fixed value may be used, but most applications
require a live pressure input. If there is no active option
card for pressure, the meter assumes you are using a
fixed pressure.
2. Proceed to one of the following steps:
• If you selected fixed - proceed to step 3.
• If you selected slot 1 - proceed to step 4.
3. Enter the known fixed process pressure and click
[next item]. The meter will only accept values from
0 to 5000 psia. Proceed to base pressure below.
4. Double-click on input A or 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.
C.5.4e Base pressure
1. Enter the base pressure and click [next item]. The
ratio of this value to the actual pressure is used to
calculate the standard mass flow rate.
C.5.4f Low pressure switch
1. Click on yes or no to activate or deactivate the low
pressure switch software function and click [next item].
• If you selected yes, enter the pressure limit , the
low pressure switch set point, and click [next item].
The acceptable range is 0 to 5000 psia. The meter
will stop taking readings if the pressure drops below
this value.
PanaView returns to the channel program menu.
You have completed entering input/output parameters.
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