ABB XSeries G4 6200, User Manual, Page: 97 / 168

2104349 rev. AD Page 3
–35
Since the G4 EX volume calculations are made each vol calc
period, any changes that are made during the period would
effect the volume calculations (such as changing the orifice
plate size) and be introduced into the calculations. To avoid
introduced errors, it is recommended that the Reset Volume
command be used. This command forces the G4 EX 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. This is logged
as an event before it is reset to zero (0).
3.7 Start Up the G4 EX
3.7.1 Putting the G4 EX On Line
To avoid a calibration shift, carefully follow these
instructions.
3.7.1.1
Step-by-step instructions
1) Open both the bypass valves, and close the vent to the atmosphere valve.
This stabilizes the pressure on both sides of the cell.
2) Begin to slowly open the high side orifice tap valve from the meter run.
3) Begin to slowly open the low side valve.
4) Once both the high and low sides are completely open, close both bypass
valves.
3.7.2 Setting G4 EX Temperature Calculation
The G4 EX temperature calculations can be set to the following conditions:
1) RTD Installed
– This uses the RTD temperature input and stores the RTD
temperature unless the RTD fails. Additionally, it then uses and logs the
Fixed GF value.
2) Use Fixed TF
– This uses and stores the fixed temperature.
3.8 G4 EX Standard Displays
3.8.1 Program Display
The single tube G4 EX comes from the factory with a set of default displays (see
Table 3
–5). By default, each display item remains on the display for five seconds.
The user has the ability to change this default to zero (item not displayed) or any
value from 1 to 255 seconds. The user is 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 user programmable and may be displayed by user defined
parameters.
Table 3
–5 G4 EX Displayed Items