Zero Transducer; Static Pressure; Differential Pressure; Rtd Calibration And Bias - ABB XSeries G4 6200 User Manual

4) Next, the user will need to click on the K-Factor button. Enter a value, and

4.15 Zero transducer

During the process of setting pressure markers to determine the need for a
calibration of either the static pressure (SP) or the differential pressure (DP), the
user may conclude that the SP or the DP pressures are out of alignment at exactly
the same amount at each pressure marker (linear shift). When this occurs, the
user may either recalibrate the G4 EX or they can set the transducer to zero. The
preferred method is to recalibrate the G4 EX. This maintains the G4 EX records in
a manner that assures accountability and continuity when other measurement
issues arise. By using the Zero Transducer command, all references to previous
pressure markers are non-existent, eliminating the ability to adjust volumes based
on previous markers.

4.15.1 Static pressure

The SP can be zeroed without recalibrating. If the SP shifts, the user can enter a
new barometric pressure value. This shifts the SP transducer curve. After the Hold
state initiates, select Zero Transducer.

4.15.2 Differential pressure

The DP can be zeroed without recalibrating. If DP shifts, the user can enter a new
zero (0). This shifts the DP curve. After the HOLD state begins, select Zero
Transducer.

4.16 RTD calibration and bias

The Totalflow G4 EX has one onboard RTD input. The registers representing the
RTD input is normally assigned to a measurement tube. The RTD tab is located in
the Calibrate screen within the Onboard I/O tree-view. The user will need to click
the Analog Inputs sub-menu, and move to the RTD tab (see Figure 4–13).
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click the OK button. Input pulses are multiplied by the K-Factor. To have a
one-to-one pulse count, user a factor of 1.
Please take into consideration that these inputs may have
the de-bounce enabled or disabled. This feature is
discussed in the PCCU32 Help Files and is also turned on
or off within PCCU32.
Using the Zero Transducer capability assumes that the shift
is linear. This means that at different levels of pressure the
transducer is off by exactly the same amount. If this is not
the case, the user needs to recalibrate the transducer
instead.
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