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5. For concentration measurement: Check the values displayed in the Density Offset and
Referred Density (Concentration) fields.
If the calibration succeeded:
• Density Offset displays the updated value for this parameter.
• Referred Density (Concentration) shows this process variable with the new density
offset applied. This value should match the laboratory reference value.
If the calibration failed, Density Offset is reset to the original value.
• Verify your laboratory reference value.
• Ensure that your process was stable during the entire procedure.
• Ensure that the active concentration matrix is valid.
• Repeat the calibration.
9.5.3 Perform density offset calibration using the
Field Communicator
Density offset calibration is used to verify or adjust the value of Density Offset. Density Offset is
always added to the measured density value after the density meter factor is applied, and
before other processing is performed.
The default value of Density Offset is 0.
Restriction
Density offset calibration is available only when API referral or concentration measurement is
enabled on your meter. If neither of these is enabled, Density Offset must be entered manually.
Tip
Density offset calibration is the preferred method for calculating a density offset, because the
procedure automatically corrects the data to reference temperature and reference pressure. If this
procedure is available on your device, use it and do not set Density Offset manually.
Prerequisites
Ensure that your process is stable during the calibration procedure. Minimize variation in
density, temperature, flow rate, and fluid composition. Minimize aeration.
If concentration measurement is enabled on your meter, ensure that Active Matrix is set to
the matrix that you want to calibrate.
Following the procedures defined in ASTM 1298 or API 555, obtain a laboratory reference
value for the density of your process fluid at reference temperature and reference
pressure.
Procedure
1. Navigate to the Density Offset Calibration method: Service Tools > Maintenance >
Calibration > Density Offset Calibration.
Measurement support
146 Micro Motion
®
Fork Viscosity Meters (FVM)