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1.7.7 Base Pressure
10. Enter the Base Pressure and press [Enter]. The ratio of this value to the actual pressure is used to calculate the
standard mass flow rate.
1.7.8 Low Pressure Switch
11. Scroll to Yes or No to activate or deactivate the Low Pressure Switch software function and press [Enter].
If you selected Yes, enter the Pressure Limit, the low pressure switch set point, and press [Enter]. The acceptable
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range is 0 to 5,000 psia. The meter will stop taking readings if the pressure drops below this value.
If you selected No, go to Quality Input (step 12) below.
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1.7.9 Quality Input
When the temperature and pressure inputs indicate that the steam is saturated, the
mass flow rate calculations. Unless a different value is accurately known, accept the default value at the following
prompt:
Note: The quality value indicates what fraction of the fluid is in the gas phase. The remaining fraction is assumed to
be liquid water. Thus, a quality value of 1.0 indicates 100% gas.
12. At the Quality Input prompt, scroll to a fixed steam quality value or to set up the option card in Slot 1 that will
supply the live steam quality input and press [Enter].
Note: If Slot 1 contains an activated option card with an analog input that has been programmed as
appears as an option at the above prompt. Normally, a fixed value of 1.0 (100% steam) should be used for the
steam quality value.
If there is no active option card for a special input, the meter assumes you are using a fixed quality value.
If you selected Fixed, proceed to Step 13.
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If you selected Slot 1, proceed to Step 14.
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13. Enter the known Fixed steam Quality and press [Enter]. (The meter will accept values from 0.0000 to 1.0000.) Go
to Procedure Options below.
14. Scroll to Input A or Input B and press [Enter]. 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.
Procedure Options
After completing the above steps, the XGS868i returns to the Channel PROGRAM window. Do one of the following:
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To continue programming, refer to Appendix A, Menu Maps, to navigate to the desired menu.
To leave the Keypad Program, press [Escape] three times.
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DigitalFlow™ XGS868i Programming Manual
Chapter 1. Programming Site Data
Quality Input
value is used for the
Special
, Slot 1
13
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