Comparing on-line viscosity measurements to the lab is challenging. Process conditions can change, laboratory samples can off-gas, fluids may be non-Newtonian and measure
differently on different viscometer technologies. Even when controlling for all variabilities, it is not uncommon for laboratory data and on-line process viscosity data to differ and yet remain consistent, tracking with one another over time. To address this situation, Cambridge Viscosity added a Field Calibration feature to the VISCOpro 2100.
The Field Calibration differs from the standard calibration in that it utilizes slope and offset to adjust the on-line viscometer reading to match the lab without altering
the underlying calibration curve based on NIST traceable viscosity standards. The Field Calibration feature can be accessed through the UI or through the WIFI interface with a smart phone or mobile device.
The example below illustrates how to use the Field Calibration feature:
Consider a set of inline viscosity measurements made on a non-Newtonian fluid with our VISCOpro2100 and compared to readings made with a benchtop viscometer in a laboratory setting. Plotting the data in Excel and using the intercept and slope functions to calculate slope and offset:
These Slope and or Offset adjustment can now be applied to the measured viscosity. This is best performed using the systems Web Interface.
Once connected to the VISCOpro2100 web interface using either the WIFI feature or an ethernet cable, select the Admin button, enter the password (see user manual). The Calibrate menu will now appear. Select Field Calibrate and the menu below will be available for input of a Slope and Offset.
Once enabled, the reported viscosity readings be adjusted based on the slope and offset values to closely match expected laboratory results.
Contact sales@cambridgeviscosity.com with any questions.
