Panametrics DigitalFlow GS868, Programming Manual, Page: 25 / 146

DigitalFlow™ GS868 Programming Manual (2-Channel) 15
Chapter 1. Programming Site Data
1.7.4.3 Entering the Temperature Input
5. 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.
6. Do one of the following:
• If you selected FIXED , enter the known fixed process temperature. Press [ENT] . (The meter will only accept
values 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.
1.7.4.4 Entering the Pressure Input
7. At the Pressure Input prompt, press [F1] to enter a constant pressure value or press [Fx] to select the option card
in Slot X that will supply the live pressure input.
Note:
Each slot that contains an option card with an analog input assigned to
PRESR
will appear on the option bar.
If the process pressure is stable, a fixed value may be used, but most applications require a live pressure
input.
8. Do one of the following:
• If you selected FIXED , enter the known fixed process pressure. Press [ENT] . (The meter will only accept values
from 0–5000 psia.)
• 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.
b. Enter the
Base Pressure (standard) value for the process, and press the
[ENT] key. (The meter will only accept
values from 0–5000 psia.)
c. Press [F2] = YES to activate the Low Pressure Switch, or press [F1] = NO to turn the switch off.
• If you selected NO , proceed to step 9.
• If you selected YES , enter the Pressure Limit (the setpoint for the low pressure switch) and press [ENT] . The
acceptable range is 0 to 5,000 psia. If the pressure drops below the pressure limit, the GS868 will stop taking
readings.
1.7.4.5 Entering the Quality Input Value
9. At the Quality Input prompt, press [F1] to enter a constant steam quality value or press [Fx] to select the option
card in Slot X that will supply the live steam quality input. This value is used for mass flow calculations when the
temperature and pressure inputs indicate that the steam is saturated. Unless a different value is accurately
known, accept the default value.
Note:
Each slot that contains an option card with an analog input that has been programmed as
SPEC
in the
OPTN
submenu appears on the option bar. Normally, a fixed value of 1.0 (100% steam) should be used for the steam
quality value.
10. Do one of the following:
• If you selected FIXED , enter the known fixed steam quality. Press [ENT] . (The meter will only accept values from
0.0000 to 1.0000.)
• 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.
Procedure Options
After completing the above steps, the meter returns to the main I/O prompt. Continue as follows: