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40 Model 2700 Transmitter with PROFIBUS-PA
Calibration
Note: Before performing the calibration, record your current calibration parameters. If you are using
ProLink II, you can do this by saving the current configuration to a file on the PC. If the calibration
fails, restore the known values.
3.7.1 Preparing for density calibration
Before beginning density calibration, review the requirements in this section.
Sensor requirements
During density calibration, the sensor must be completely filled with the calibration fluid, and flow
through the sensor must be at the lowest rate allowed by your application. This is usually
accomplished by closing the shutoff valve downstream from the sensor, then filling the sensor with
the appropriate fluid.
Density calibration fluids
D1 and D2 density calibration require a D1 (low density) fluid and a D2 (high density) fluid. You may
use air and water. If you are calibrating a T-Series sensor, the D1 fluid must be air and the D2 fluid
must be water.
For T-Series sensors, the D1 calibration must be performed on air and the D2 calibration must be
performed on water.
For D3 density calibration, the D3 fluid must meet the following requirements:
• Minimum density of 0.6 g/cm
3
• Minimum difference of 0.1 g/cm
3
between the density of the D3 fluid and the density of water.
The density of the D3 fluid may be either greater or less than the density of water.
For D4 density calibration, the D4 fluid must meet the following requirements:
• Minimum density of 0.6 g/cm
3
• Minimum difference of 0.1 g/cm
3
between the density of the D4 fluid and the density of the D3
fluid. The density of the D4 fluid must be greater than the density of the D3 fluid.
• Minimum difference of 0.1 g/cm
3
between the density of the D4 fluid and the density of water.
The density of the D4 fluid may be either greater or less than the density of water
3.7.2 Density calibration procedure
To perform a D1 and D2 density calibration, refer to the menu flowcharts Figures 3-12, 3-13, and
3-14.
To perform a D3 or a D3-and-D4 density calibration, refer to the menu flowcharts in Figures 3-15,
3-16, and 3-17.