Viscometers
Instruments used to measure the viscosity of a fluid; available in a variety of configurations.
Viscometers or viscosimeters are important to many industries, including the adhesive, biotech, chemical, food, paint, petroleum, and pharmaceutical industries.
What Is a Viscometer?
Viscometers are instruments used to measure viscosity, the internal friction of the layers of a liquid in motion. An example is the slower flow of syrup from a container — syrup is more viscous than water.
How Is Viscosity Measured?
In general, viscometers move an object through a stationary fluid or move the fluid past a stationary object to measure the friction between the fluid and the object or surface. Viscometers measure using a single flow condition.
What Are the Different Types of Viscometers?
- Glass capillary viscometers or Ostwald or Ubbelohde viscometers consist of a U-shaped glass tube held vertically in a controlled temperature bath. Liquid is drawn by suction into the upper bulb and allowed to flow down into the lower bulb. You calculate viscosity by measuring the amount of time it takes for the liquid to move between two marks.
- Falling ball viscometers measure the time it takes for a sphere of a known size and density to descend through a stationary liquid. This can be done electronically for opaque fluids.
- Rotational viscometers use the concept of torque to measure the effort required to turn a disk or bob in a fluid. Rotating bobs are more common, rotating cups reduce the likelihood of vortex formation, and "cone and plate" viscometers create a constant shear rate at any speed.
Canon Instrument Co Ubbelohde Viscometer, Size 0, Calibrated
The Ubbelohde Viscometer measures kinematic viscosity of transparent Newtonian liquids according to ASTM D445 and ISO 3104. Minimum sample volume is 11 mL. Minimum bath depth is 241 mm (9.5 in). Unity factor series has a constant within +/- 0.2% of the values listed. Approximate Constant (mm²/s²): 0.001. Viscosity Range (mm²/s): 0.3-1.0
Bellco Glass, Inc. Pre-mounted stainless steel clamps for bellco Erlenmeyer flask. Flask tray fits on top of the standard tray platform. Includes clamps. Flask positions: 9 Size:1l
Pre-mounted stainless steel clamps for bellco Erlenmeyer flask. Flask tray fits on top of the standard tray platform. Includes clamps. Flask positions: 9 Size:1l
Bellco Glass, Inc. Manufactured from type 1 class a Borosilicate glass. Designed for the measurement of microbial co2 production over time. Ideal for bio-remediation studies. All components are autoclaveable
Manufactured from type 1 class a Borosilicate glass. Designed for the measurement of microbial co2 production over time. Ideal for bio-remediation studies. All components are autoclaveable
Sigma Aldrich Fine Chemicals Biosciences NorellR Sample Vault Serie
for Bruker(R) SampleJet(TM) robotic high-throughput automated systems. NMR tubes with NorLoc(TM) caps are designed to be used with 96 position carriers using 103.5 mm (4 in.) long NMR tubes with open port caps or 178 mm (7 in.) long NMR tubes with closed port caps. NorLoc caps have superior holding and sealing capabilities which eliminate cap/tube failure in your instrument.Patent pending design incorporates a blue band positioned on the NMR tube that aligns with the base of the cap indicating a properly locked position. The NorLoc cap and Sample Vault Series tube is an integrated closure system for fail-safe delivery of your sample to the magnet. Tubes are available in both 3 mm and 5 mm diameters for use up to 700 MHz and up to 950 MHz.Engineered for new generation high-throughput lab automation systemsTwo precision types for up to 700 MHz and up to 950 MHz spectrometersSuperior NorLoc cap attaches semi-permanently for multiple use and for critical applicationsC
Bellco Glass, Inc. Thermowell assemblies are used to hold inside one tube the rtd temperature sensor that monitors the temperature within the vessel in conjunction with a temperature controller. There are also tubes for addition of media and vent tube. Thermowell assemb
Thermowell assemblies are used to hold inside one tube the rtd temperature sensor that monitors the temperature within the vessel in conjunction with a temperature controller. There are also tubes for addition of media and vent tube. Thermowell assemb