DigitalFlow™ XGS868i Programming Manual
11
Chapter 1. Programming Site Data
1.7 Entering Zero Cutoff and Setting Up Inputs
Enter the zero cutoff value and set up the temperature and pressure inputs via the
I/O
submenu. While programming
these parameters, refer to Figure 28 on page 77.
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 25 for setup instructions.
1.7.1 Zero Cutoff Value
Near a zero flow rate, the Model XGS868i’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 below.
1.
In the
Keypad Program
, scroll to
PROG
and press
[Enter]
.
2.
In the
PROG
menu, scroll to
CH1
or
CH2
and press
[Enter]
.
3.
In the
Channel PROGRAM
menu, scroll to
I/O
and press
[Enter].
4.
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
0.0200 ft/sec (0.0009 m/sec).
1.7.2 Assume Saturation
This prompt permits you to use a single input for either temperature or pressure to measure mass flow. The
User
Program
contains a table that correlates pressure and temperature for saturated steam. If the meter can assume the
steam is always at or near saturation, then only a temperature or pressure input is needed. The meter will interpolate the
corresponding pressure or temperature.
1.
At the
Assume Saturation?
prompt, scroll to
No
or
Yes
and press [
Enter]
.
•
If you selected
Yes
, proceed to Step 2 below.
•
If you selected
No
, proceed to Step 3 on the next page.
1.7.3 Steam Input Type
2.
Scroll to the
Steam Input Type
that will be used to measure mass flow and press
[Enter]
.
•
If you selected
Temperature
, proceed to
Temperature Input
on the next page.
•
If you selected
Pressure
, proceed to
Base Temperature
on the next page.
IMPORTANT:
GE Measurement & Control recommends using a live input for either temperature or pressure when
assuming the saturation.
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