Filter
Top Products
9.5.2 Perform density offset calibration using ProLink III
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 wizard: Device Tools > Calibration > Density
Offset > Density Offset Calibration.
2. Enter the laboratory reference value for density.
3. Click Apply Offset and wait for a few seconds while the calibration process is
performed.
4. For API referral: Check the values displayed in the Density Offset and Referred Density
(API) fields.
If the calibration succeeded:
• Density Offset displays the updated value for this parameter.
• Referred Density (API) 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.
• Repeat the calibration.
Measurement support
Configuration and Use Manual 145