A probe capillary viscometer

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Abstract
A viscometer has been designed in which the sample under test is withdrawn through the capillary viscometer by means of a remote motor driven syringe pump, and the pressure developed across a finite length of the capillary is sensed through small holes bored through the wall and measured by means of a remotely placed differential pressure transducer. Liquid filled tubes connect the probe to both the pump and the transducer. The ratio of the pressure difference to the flow rate is proportional to the `apparent' viscosity of the sample. Tests on the laboratory bench with standard solutions indicate that a measurement with a standard deviation of about 07% can be attained on sample volumes of under 1 ml.

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