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Configuration and Use Manual 13
Startup
Startup ConfigurationCalibrationBefore You Begin
2.7 Configuring pressure compensation
Due to process pressure change away from calibration pressure, there can be a change in sensor flow
and density sensitivity. This change is called pressure effect. Pressure compensation corrects for these
changes.
Not all sensors and applications require pressure compensation. Contact Micro Motion Customer
Service before you configure pressure compensation.
Configuring pressure compensation requires three steps:
1. Determining pressure compensation values (Section 2.7.1)
2. Enabling pressure compensation (Section 2.7.2)
3. Selecting a pressure source (Section 2.7.3)
2.7.1 Pressure compensation values
There are three values involved in pressure compensation:
• Flow factor – The flow factor is the percent change in flow rate per psi. Consult the product
data sheet for your sensor for this value. You will need to reverse the sign of the flow factor.
For example, if the flow factor in the product data sheet is –0.001% per psi, the pressure
compensation flow factor would be +0.001% per psi.
• Density factor – The density factor is the change in fluid density, in g/cm
3
per psi. Consult the
product data sheet for your sensor for this value. You will need to reverse the sign of the
density factor. For example, if the density factor in the product data sheet is –0.00004 g/cm
3
per psi, the pressure compensation flow factor would be +0.00004 g/cm
3
per psi.
• Flow calibration pressure – The pressure at which the flowmeter was calibrated. Refer to the
calibration document shipped with your sensor. If the data is unavailable, use 20 psi (1,4 bar).