Viscometers are used to define the viscous properties of a fluid at ambient or defined temperatures. They commonly come in the form of a calibrated capillary tube through which a liquid is allowed to pass at a controlled temperature in a specified time period. Other methods include rotational viscometry and falling ball tests.
Viscometers can have a few different technologies by which they operate. For rotational viscometry, torque is required to rotate a spindle at constant speed while...
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Q & A on Viscometers
We asked our users for their input on Viscometers. Here are the results of 119 users familiar with Viscometers.Who Took Our Poll? | Design Trends | Applications and Use | Features | Buying Advice
Who Took Our Poll?Top
Techniques based on oscillation, rotation and translation.
Easy to calibrate, easy to use by non-qualified technicians, temp. stability and regulation approved, easy to clean capillaries, easy maintenance and of course competitive prices.
Haake Viscometers (Thermo Haake GmbH - Germany 2. Brookfield Viscometers (Brookfied Inc - USA They are best designers in the world)
Malvern Instruments, Brookfield Engineering Laboratories Inc., Dynisco, Anton Paar-Physica Rheometers, Rheologica Instruments AB, Stable Micro Systems Ltd, Thermo Fisher Scientific.
Applications and UseTop
Ink rheology, biomaterial rheology, protein drug formulation, nanoparticle rheology, polymer rheology, low viscosity material viscosity measurement...
Drug stability study, nanoparticle drug delivery, high shear ink analysis (>1M 1/s shear rate).
In some machines, Non-Newtonian liquids which it is not capable for.
Wrong 'tip' used, so 1000kg of product sent to rework when it should have gone to customer.
-Flame is applied and an observation made as to whether or not a flash has occurred; -a value below the so-called maximum could be disastrous; -is the build-up of acid due to some kind of decomposition or chemical reaction
Mishandling the spindles, as well as overvoltage, may definitely damage the equipment.
If a manufacturer can design a Viscometer to cover high/medium/low ranges without changing rotors and sensors.
It should be a laboratory type and easy to operate, and hold its accuracy even when operating at more than 200 degrees centigrade.
Small sample volume, easiness for loading and cleaning, rapid measurement time, accuracy at low viscosity range.
Yes, be careful when choosing between meeting standards like ASTM and equivalent to the ASTM Standards or IP standards!!!
Understand the temperature pressure of your product stream. Understand that viscosity changes with temperature.
Yes, refer to the correct standard test method ISO, ASTM any other standards according to their country.
Consider: User friendliness, Repeatable, accurate results, Back-up service, Availability of spares and spare unit, Time to repair, Local support, Robust, Calibration, Cost of consumables.
I think nowadays networking may be an important tool for getting advice before buying a viscometer. I also strongly recommend some practical courses on viscosity measurement for correct usage of a viscometer. http://www.brookfieldengineering.com/services/educational-programs/practical-course.asp
Know your stream data in advance of selecting a viscometer. Share this info with your vendor. Have utilities available to condition the product sample.
YES: 1. Learn metrology first. 2. Select from the market the most accurate viscometer in measurement & calibration of basic quantities contributing to viscosity (Temperature, dimensions of all pieces in contact with the liquid specimen, force, mass); 3. Users must make their own standard liquids.