Chapter 1. Programming Site Data
14
DigitalFlow™ XMT868i Programming Manual
1.3.4
Entering Input/Output Parameters
Enter the zero cutoff value and set up the temperature inputs using the
I/O
submenu. While programming these
parameters, see Figure 30 on page 9.
IMPORTANT:
If an option card in
Slot 1
fails to appear in this menu, it may be turned
OFF
. See the
GLOBL-I/O-OPTN
section on page 28 for setup instructions.
1.3.4.1
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 PROGRAM
menu, scroll to the
I/O
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
press
[Enter].
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.
1.3.4.2
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 Supply
prompt, scroll to
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.
Summary of Contents for DigitalFlow XMT868i
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