106 XFC G4 2103335 Rev AB
introduced errors, it is recommended that Reset Volume command be used. This command forces the flow computer to perform
volume calculations for the elapsed time since a previous volume calculation was made. A new partial period volume is added to
the volume accumulator, which is logged as an event before it is reset to zero (0).
5.8.3.1 Description
When the volume accumulator is reset the flow computer will:
— Store time, date and previous accumulated partial calc period volume into the historical record file.
— Zero the remaining partial calc period accumulation.
— Complete all computations for the present flow file daily record.
— Begin a new flow file daily record.
— Zero total volume accumulator and log the event with an accumulator value before zeroing out accumulator.
5.9 XFCG4 Standard Displays
5.9.1 Program Display
The single tube flow computer comes from the factory with a set default displays as shown below. By default, each display item
remains on the display for 5 seconds. You have the ability to change this default to zero (item not displayed) or any value from 1
to 255 seconds. You are also able to change the engineering units, and data format for display purposes. Further instructions on
programming the display system can be found in the PCCU32 Help Files. All display items and item groups are programmable
and may be displayed by user defined parameters.
Table 13 XFC
G4
Displayed Items
Yesterday’s Percent DP Low Limit Percent time
below DP Low Set Point
Yesterday’s Percent DP High Limit Percent time
below DP High Set Point
Current Flow Rate Programmable SCF or MCF
or MMCF
Total Accumulated Volume Programmable SCF
or MCF or MMCF
Differential Pressure Inches H2O
Static Pressure Static PSIA
Yesterday’s Volume Programmable MCF or
MMCF
Previous Period Volume Last volume
calculation period volume
10 Character alphanumeric identifier
10 Character alphanumeric application or tube
identifier
5.10 Key Pad
The XSeries models may be configured to include the optional keypad (see Figure 83) located on the front cover of the unit. The
keypad entry allows the user to monitor programmed display items without using additional equipment (see Table 14).