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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 wizard: OFF-LINE MAINT > OFF-LINE CAL >
DENS CAL OFFSET and activate Select.
If concentration measurement is enabled, the active matrix is displayed. Activate
Scroll to continue. The current reference temperature is displayed.
2. Activate Scroll to move to the next step.
3. Enter the laboratory reference density and save it to the transmitter.
4. Activate Select to apply the offset, and wait for a few seconds while the calibration
process is performed.
If the calibration succeeded, the calculated density offset is displayed.
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.
• Repeat the calibration.
5. Activate Scroll to view the referred density value.
• For concentration measurement, Referred Density (Concentration) is displayed.
• For API referral, Referred Density (API) is displayed.
6. To exit the calibration, activate Scroll, then activate Select.
Measurement support
144 Micro Motion
®
Fork Viscosity Meters (FVM)