Appendix C. Programming the XMT868i Using PanaView™
38
DigitalFlow™ XMT868i Programming Manual
C.5.4 Entering Input/Output Parameters
Enter the zero cutoff value and set up the temperature, pressure and quality inputs using the Input/Output submenu.
While programming these parameters, refer to Figure 53 on page 71.
IMPORTANT:
If an option card in
Slot 1
fails to appear in this menu, it may be turned
OFF
. See the
Global-I/O-Options
section on page 50 for setup instructions.
C.5.4.1 Zero Cutoff Value
Near a zero flow rate, the Model XMT868i’s 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).
Proceed with one of the following:
•
If the ENERGY OPTION is OFF, the display now returns to the Channel
menu.
•
If the ENERGY OPTION is ON, refer to
Temperature Input
below.
C.5.4.2 Temperature Input
The Model XMT868i can use either a fixed temperature value or a live temperature input to calculate energy.
Complete the following steps to configure this input:
Note:
The site data programmed in this chapter is automatically stored in the meter’s non-volatile RAM (NVR). If
the power to the meter is disconnected, the same site data will be applied when the unit is next powered on.
3. At the
Temp Input Supply
prompt, double-click on
Fixed
to enter a constant temperature value or on
Slot1
to
select the output in Slot 1 that will provide the live temperature input for the supply.
Note:
If Slot 1 contains an activated option card with an analog input assigned to
TEMP
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.
4. One of the following two prompts will appear, depending on your selection in Step 3.
•
If
Fixed
was chosen, enter the known fixed process temperature and click
[Next Item]
.
The meter will only
accept values from –328° to 1832°F (–200
o
to 1000
o
C).
•
If
Slot 1
was chosen, double-click on the desired temperature input (from A to D).
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