ABB XRC G5, User Manual

Page: 123 / 145

2106026MNAA | XSERIES G 5 | 123
On the Checks tab, select SP from the Calibration drop-down menu.
Define the SP display value: Absolute or Gauge ( Figure 11-1: SP calibration pressure
checks ).
IMPORTANT NOTE: Selecting Absolute will display the value with the barometric pressure
added. Subsequent values require that the barometric pressure be added to the value
before it is entered.
Selecting Gauge will display values in gauge pressure. Subsequent values require that the
entered values be in gauge pressure.
Figure 11-1: SP calibration pressure checks
Click Enter Pressure Check Value.
In the Enter Pressure dialog box, select Continuous to update the current reading.
Verify that the vent valve is closed.
Open both the high and low equalizer valves.
Close both the downstream and upstream tap valves.
Open the atmospheric vent valve.
Enter a pressure marker for atmospheric pressure (PSIA). Enter zero if in Gauge mode, or
the barometric pressure (or contract value) if in Absolute mode.
Click OK .
Close the atmospheric vent valve.
Click Enter Pressure Check Value.
Connect the calibration standard to the calibration test port.
Apply pressure to the next verification pressure.
When the current reading stabilizes, enter the pressure value from the calibration source.
Add the barometric pressure if the pressure type is Absolute. Click
OK .
Repeat steps 16 through 17 for each pressure check value.
After all the static pressure markers have been set, determine if calibration is required. Return the
manifold to service before exiting Calibration mode if more calibration is not required.
11.1.2 Differential pressure checks