Calibrating and Adjusting Rheometer Systems

To ensure the consistent quality of your measurement results, it is important to check your rheometer at regular intervals.

This guideline is valid for the UDS rheometer and all MCR xx0 and MCR xx1 series rheometers.

Introduction

Checking a rheometer requires an air measurement and measurement of a certified viscosity standard, also called a standard oil. The inertia of the used measuring system can also be determined.

The air measurement is carried out to check the quality of the motor adjustment and the condition of the bearing. During the motor adjustment the residual friction in the bearing is measured. The measured values are saved in the rheometer electronics and used for every measurement. With air-bearing supported motors these values are extremely low. However, the friction can be noticeable at low torques, e.g. when measuring low-viscosity liquids.

The adjustment of the rheometer is checked by measuring a viscosity standard. Generally speaking, this check can be carried out with any measuring system if the standard chosen has a viscosity value suitable for the measuring system. However, it is best to use cylinder systems as they are least affected by the filling volume and fluctuations of the room temperature. As a reference, use the cylinder system CC27 and a viscosity standard in the range from 1500 mPas to 2000 mPas at 20 °C (2000 AW from the German Calibration Service). The table below gives an overview of viscosity values suitable for other systems.

Type ø [mm] Viscosity [mPas]
Cylinder < 17 5000 to 10000
Cylinder ≥ 17 1000 to 2000
Cone or plate < 50 5000 to 10000
Cone or plate ≥ 50 500 to 2000
Double gap - 50 to 100

 

If the check is carried out with a cone or plate, a temperature-controlled hood must be used as the viscosity values of the standard oils are generally very dependent on the temperature. If you want to check the temperature before the measurement, use a calibrated thermometer.

With cylinder measuring systems, the temperature sensor can be positioned in the wall of the measuring cup. Temperature plates have an opening for the sensor in the side.

RheoManager

Figure 1: RheoManager.

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This information has been sourced, reviewed and adapted from materials provided by Anton Paar GmbH.

For more information on this source, please visit Anton Paar GmbH.

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