How accurate are Zahn cups?

How accurate are Zahn cups?

A Zahn cup’s accuracy is typically within 1 second of a known standard. For accuracy, each cup should have a correction, which is determined by comparing the measured viscosity to a viscosity standard. This needs to be appropriate to the size of the cup being used.

Who invented the Zahn cup?

The Zahn Cup is produced not only by different suppliers in the United States but also in countries throughout the world such as England, France, Italy, and West Germany. However, The Paul N. Gardner Company is the only licensed producer by the inventor E. A. Zahn. 12.

What is Zahn viscosity cup?

A Zahn cup is a device to measure viscosity that is frequently used in the paint and coating industries. It is a field instrument used to check a fluid’s viscosity at the job site and is made from stainless steel with a small hole in its bottom center. A Zahn cup is also known as a viscosity cup.

Are all viscosity cups the same?

There are a variety of viscosity cup sizes and types which will cover different ranges of viscosity. They use the amount of time the material takes to flow through the cup to help you determine the viscosity in centipoise. However a lot of times you may have a thicker coating with a higher viscosity.

How do you make a viscosity cup?

Use a spur-point bit to drill a hole through a plastic bottle cap. Cut away excess plastic from the bottle, leaving a 100 milliliter cup with a handle. Use the resulting viscosity cup to measure the flow rate of paint, stain, or wood finish.

How do you calibrate a viscosity cup?

  1. Examine the cup for obvious obstruction or damage to the orifice area and general cleanliness of cup.
  2. Place cup in stand and level the top edge.
  3. Select the recommended Certified Viscosity Standard for the cup to be calibrated.
  4. Pour a sufficient amount of oil into a 250 ml container to exceed the capacity of the cup.

What is viscosity of honey?

A quick internet search shows that the viscosity of honey is 10,000 cP at a room temperature of 21.1°C. More research reveals that blended flower honey has a viscosity of approximately 12,200 cP at the same temperature.

What is the viscosity of coffee?

0.0008-27.4810 Pa·s
The coffee extract viscosity varies in the range of 0.0008-27.4810 Pa·s for the considered cases. The coffee extract boiling temperature varies in the range of 100.0-103.3 °C at atmospheric pressure.