Digital Rotational Viscometer ADVR-504

1. What is a Digital Rotational Viscometer and how does it work?

A Digital Rotational Viscometer is an instrument used to measure the viscosity of liquids by rotating a spindle in the fluid and recording the torque resistance. The torque needed to rotate the spindle correlates directly with the fluid's viscosity. A digital display shows real-time measurements, often in centipoise (cP) or milliPascal-seconds (mPa·s).

2. Can a Digital Rotational Viscometer measure both low and high viscosity samples?

Yes, most digital Rotational Viscometer can measure a wide range of viscosities by using different spindles and adjusting rotational speeds. It comes with multiple spindles and offer extended ranges, covering fluids from as low as 1 cP to over several million cP. However, for extremely low or high viscosities, special accessories like UL adapters or high-torque motors may be required.

3. How often should a Digital Rotational Viscometer be calibrated?

It’s generally recommended to calibrate your viscometer at least once a year, or more frequently if it's used in critical applications or harsh environments. Calibration should be done using certified standard viscosity fluids traceable to national standards (e.g., NIST). Deviations can occur due to spindle wear, electronic drift, or mechanical misalignment. Regular calibration ensures accurate, traceable, and repeatable results.

4. Can I use a Digital Rotational Viscometer for non-Newtonian fluids?

Yes, Digital Rotational Viscometer is particularly well-suited for measuring non-Newtonian fluids, whose viscosity changes with shear rate. This instrument allows control over spindle speed, enabling observation of viscosity at different shear rates. This is valuable for characterizing fluids like paints, lotions, ketchup, and gels. However, it's crucial to record the speed and spindle used for each test, as results may vary widely.

5. Is it possible to automate Digital Rotational Viscosity measurements?

Yes, Digital Rotational Viscometer can be integrated into automated systems or used with accessories like auto-samplers, temperature controllers, or programmable testing routines. Automation helps in high-throughput environments or when repeatability is critical. It can run predefined test programs that change speed, time, or temperature in a sequence.