How to Measure Viscosity with the RM 100
If you want to measure the viscosity of a liquid you would, quite naturally, use a viscometer – although you can also call it viscosimeter if you so desire. Viscometers work well with liquids that do not vary with flow conditions (otherwise you will want to use a rheometer) and they come in a variety of different forms: falling piston viscometers, oscillating piston viscometers, vibrational viscometers, rotational viscometers, bubble viscometers and micro-slit viscometers.
A whole class of viscometers uses a spring-based system, and a rotating arm, which measures the torque required to achieve rotation of the arm. A more accurate approach, with a similar set up, involves measuring the arm motor itself to calculate the absorbed power compensation.
This has the advantage of being suitable for high torque and also requiring less calibration (and maintenance and spare parts!) than spring-based systems. The RM100 Universal Rotating Viscometer from Meritics works on the absorbed power compensation principle and is particularly advantageous for thixotropic substances.
It is fast, with a digital readout, and comes with a support stand that does not require levelling and quick-fit ‘bayonet’ spindles. There are 34 speed settings (0.3 – 1500 rpm) and a 0 – 30 mNm torque range for temperatures 0 - 120ºC. This means that viscosities can be measured between 1 and 510,000,000 mPa.s, which also means that the RM100 can cover liquids that might require three other makes or types of viscometers.
The RM100 itself comes in three versions, a laboratory model, an industrial model and a portable unit, which has an excellent 1-hour battery life. Optional Visco-RM software will allow automatic measurements on your PC as required. So it seems that whatever your viscosity measuring needs Meritics have a RM100 Universal Rotating Viscometer to meet them. Plus a two-year warranty!
Date added: 2015-05-25 12:10:55