Low Pressure Switch; Quality Input - GE XGS868 Programming Manual

Low Pressure Switch

Quality Input

Programming Site Data
1. Use the pull-down menu to activate or deactivate the low pressure
switch software function and press Next Item/Enter.
2. Proceed to one of the following sections:
If you selected Yes - proceed to Step 3.
•
If you selected No - proceed to Quality Input below.
•
3. Enter the low pressure switch set point and press Next Item/Enter.
The acceptable range is 0 to 5000 psia. The meter will stop taking
readings if the pressure drops below this value.
When the temperature and pressure inputs indicate that the steam is
Quality Input
saturated, the
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.
1. Use the pull-down menu to select 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 Next Item/Enter.
Note: If Slot 1 contains an activated option card with an analog
input that has been programmed 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.
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 steam quality and press Next Item/Enter.
(The meter will accept values from 0.0000 to 1.0000.) Go to
Procedure Options of the following page.
4. Use the pull-down menu to set up input A or input B and press
Next Item/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.
value is used for the mass flow rate
Special
, Slot 1 appears as
November 2004
1-13