Entering Zero Cutoff And Setting Up Inputs; Zero Cutoff Value; Assume Saturation; Steam Input Type - GE DigitalFlow XGS868i Programming Manual

1.7 Entering Zero Cutoff and Setting Up Inputs

Enter the zero cutoff value and set up the temperature and pressure inputs via the
these parameters, refer to Figure 28 on page 77.
IMPORTANT:
If an option card in
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.
DigitalFlow™ XGS868i Programming Manual
Slot 1
fails to appear in this menu, it may be turned
Chapter 1. Programming Site Data
I/O
submenu. While programming
Off Global-I/O-Options
. See the
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