How often should a viscometer be calibrated?
Many viscometer manufacturers recommend factory calibrations be performed on an annual or semi-annual basis. It is recommended that a system checkout be performed on an annual basis for oscillating piston viscometers, allowing one to verify proper operation within our 1% accuracy specification.
What is calibration of viscometer?
Calibration Procedures. The accuracy of your Brookfield viscometer is verified using standard oils available from Labomat Essor. Viscosity standards are Newtonian: they have the same viscosity, whatever the speed of the moving body (shear rate).
What is the unit of viscosity measured on Stormer viscometer?
The VIS-2 Digital Stormer viscometer measures fluid viscosity in Krebs Units. A paddle type spindle is driven at 200rpm by a constant speed motor. The reaction torque of the spindle rotating at 200rpm is converted to viscosity in Krebs Units.
How does a vibrational viscometer work?
The vibrating viscometer determines viscosity by allowing a vibrating blade to vibrate in a liquid and measure the resultant viscous drag. Both the shaft vibration and the detection are performed magnetically.
Why do we calibrate a viscometer?
Viscometers measure the viscosity – or thickness – of liquids and are often used in scientific, manufacturing, food service, and other industries. However, uncalibrated viscometers can compromise the quality of processes and products and cost your business extra time and money.
How do you test a viscometer?
Ways to Measure Viscosity
- Capillary Viscometer. The earliest methods for measuring viscosity were based on using capillary tubes and measuring the time it took for a volume of liquid to pass through the length of the tube.
- Zahn Cup.
- Falling Sphere Viscometer.
- Vibrational Viscometer.
- Rotational Viscometer.
What is calibration constant?
A good method for a simple calibration facility is a system where a constant airflow is produced by using two water containers and an arrangement of a virtually constant pressure head (Yue & Malmstrom, 1998). The constant water flow into the second container displaces an equal airflow out of the container (Fig.
How many types of viscometers are there?
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.