Hold Mode; Static Pressure (Sp) Calibration Checks - ABB XSeries G4 6200 User Manual

4.13.2 Hold mode

When calibrating the transducer or setting up a fixed temperature, PCCU32 will
instruct the G4 EX to ignore live values for the flow calculations for the period of
time that the G4 EX is being calibrated. During this time, the G4 EX uses SP, DP
and temperature captured at the time that calibration mode was entered. This is
referred to as the Hold mode.
To exit Hold mode:
1) Exit Calibration mode.
2) Unplug the PCCU cable at the G4 EX connector.

4.13.3 Static pressure (SP) calibration checks

The G4 EX allows the user to check the static pressure calibration and log
pressure marker check points. The user should perform this check prior to and
directly following the calibration.
During normal operation of the G4 EX, the display provides continuous SP
readouts; however, during this procedure, the G4 EX is placed in a temporary
Hold mode.
A minimum of three SP markers should be set; however, the user can enter as
many SP markers as they want. Recording too many markers could cause the G4
EX to overwrite existing older events. Only the last five checks are used by the
WinCCU editor for calibration adjustment. Enter a low, mid-low, mid, mid-high and
high value.
4.13.3.1
1) Enter the Calibration menu's Checks screen. This will place the G4 EX on
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If a method other than compressed nitrogen/deadweight
tester is used to calibrate the static pressure cell, the user
must ensure that the prescribed flange type valves are
blocked to prevent false differential pressure from being
applied to the DP cell. Additionally, ensure that both high and
low sides are pressured up during SP calibration.
Totalflow recommends performing a five point check before
and after calibration. The host software (WinCCU) is capable
of recalculating the volume based on the differences
between the previous five point check and the current five
point check.
After a secure audit trail is archived, WinCCU recalculates
the flow volumes based on the previous and current markers.
This allows more accurate results of the flow volume.
The resulting comparison pressure must not be greater than
the static pressure cell's maximum pressure.
Step-by-step instructions
Hold. Select the preferred measurement tube from the tree-view.
2104349 rev. AD