Marsh Funnel Viscometer & Graduation Jug

This marsh funnel viscometer is made out of destruction-proof plastic. Included is a graduated jug, which is essential for use with the funnel for obtaining the marsh funnel viscosity of a fluid.

A marsh funnel viscometer is used to measure the viscosity of a fluid. In practice, it is generally used to measure the viscosity of drilling mud and fluids. Viscosity is a term used to describe the level of internal friction within a fluid. The greater the viscosity, the thicker the fluid. However, note that the result obtained from a marsh funnel is not the true viscosity of the fluid. Rather, it is a qualitative measure that is valuable for relative comparisons.

The marsh funnel works in a very simple way. The funnel is filled with the fluid to be measured, which is then allowed to pass through the funnel and into a graduated measuring jug. A stopwatch is used to measure the length of time it takes for one quart of the fluid to enter into the measuring jug. It is this length of time, in seconds, that is recorded and reported as the fluid's marsh funnel viscosity.

Half of the funnel mouth is covered in 2mm mesh that, if necessary, can be used as a sieve to prevent large particles from clogging the funnel.

This marsh funnel is made out of destruction-proof plastic. Thus, it is built to last. What's more, when you purchase this device from us at LabQuip Ltd, you'll receive a graduated jug with your order.

Calibrating your Marsh Funnel Viscometer

It is important to clean and dry the funnel after use in order to keep the outlet free of obstruction. Otherwise inaccurate results may be obtained for future readings.

You should periodically check that your marsh funnel is properly calibrated. Do this by measuring the marsh funnel viscosity of freshwater. The result, at a temperature of 18 to 24 degrees Celcius, should be 26 plus or minus 0.5 seconds. If your measurement is outside of this range, use a pipe cleaner to remove any potential obstructions from the funnel outlet. Then, once satisfied that the funnel is completely free from obstructions, repeat the calibration test. If the result is still not within the correct range, then the funnel has likely been damaged, and a replacement should be sought.