What is viscometer constant?

What is viscometer constant?

If the filling temperature T F is substantially different than room temperature, the viscometer constant at test temperature TT is Co (1 + B [TT – T FD. The values of Co and B shown below are based on a coefficient of thermal expansion typical to that for a mineral oil.

How do you use a tube viscometer?

U-tube viscometers In one arm of the U is a vertical section of precise narrow bore (the capillary). Above there is a bulb, with it is another bulb lower down on the other arm. In use, liquid is drawn into the upper bulb by suction, then allowed to flow down through the capillary into the lower bulb.

What is tube viscometer?

The BS/U-Tube Viscometer measures kinematic viscosity of transparent Newtonian liquids according to ASTM D445 and ISO 3104. Viscometers are provided with a certificate of calibration and instruction sheet.

What is viscometer method?

Viscometry or viscosity method was one of the first methods used for determining the MW of polymers. In this method, the viscosity of polymer solution is measured, and the simplest method used is capillary viscometry by using the Ubbelohde U-tube viscometer.

How much does a viscometer cost?

The full model range of spring viscometers can be anywhere from $2000-10,000. Some dial-reading spring viscometers may be found for less than $2000.

What are the types of viscometer?

Three main types of viscometer are used: capillary tube (e.g., Ostwald), coaxial cylinder (e.g., Brookfield, Couette) and falling sphere (e.g., Hoeppler). For research, a sophisticated controlled stress rheometer such as a Carrimed or Bohlin may be used.

Can anyone use different viscometer during the same experiment?

It totally depends on the need and characteristics of that particular experiment. If that experient needs more than one viscometers to be used in that experiment we have to do so. And this phenomenon is applicable for every equipments used in any kind of experimental works.

How accurate is a viscometer?

The estimated accuracy in each case is about 0.1 percent. The two results differ by 0.5 percent. It is suggested that we continue to base the calibration of relative visco meters on the value of 1.002 centipoise (cP) for the viscosity of water at 20 °C and one atmos· phere.

What is cone and plate viscometer?

Cone and plate viscometers or viscosimeters are rotational viscometers that use a narrow-angled cone placed on a horizontal flat plate. The generator of the cone makes a very small angle, one to two degrees to the plate. The wedge-like space between the cone and the plate is filled with liquid to be investigated.

Why should the viscometer be dried before the measurements are done?

Drying the viscometer after cleaning Highly volatile solvents are recommended for cleaning since any remaining solvent will evaporate quickly after the sample has been flushed from the viscometer.

What are the different types of viscometer?

What is a capillary viscometer?

A capillary viscometer is an instrument used to measure the viscosity, or thickness, of a liquid by measuring how long it takes the liquid to flow through a small-diameter tube, or capillary. Viscosity is thus an important property of fluids.

What is the constant of a viscometer?

The constant (K) of the instrument is determined on a liquid of known viscosity. The apparatus consists of a glass suspended-level viscometer (see Fig.) made of clear borosilicate glass and constructed in accordance with the dimensions shown in the figure and in Table 2.

What does the BS/U-tube viscometer measure?

The BS/U-Tube Viscometer measures kinematic viscosity of transparent Newtonian liquids according to ASTM D445 and ISO 3104. Minimum sample volume is 7 mL (size A-C); 12 mL (size D-F); 23 mL (size G-H). Minimum bath depth is 280 mm (11 in). Viscometers are provided with a certificate of calibration and instruction sheet.

What type of viscometer do you use to measure opaque liquids?

BS/IP/RF U-Tube Reverse Flow glass capillary viscometers are ideal for the measurement of opaque liquids within a range of 0.6-300,000 cSt. Includes a calibration certificate with Constant values at 40°C and 100°C. Viscometers conform to ASTM D445, D446, ISO 3104, ISO 3105 and UNE 400313 standards.…

What is the ASTM D445 standard for viscometers?

Viscometers conform to ASTM D445, D446, ISO 3104, ISO 3105 and UNE 400313 standards.… Calibrated viscometers For measuring kinematic viscosity of opaque Newtonian liquids Meets ASTM D 445 and ISO 3104 Specifications conform to ASTM D 446 and ISO 3105.