Fluidan’s unique technology

RheoStream® is a fully automated capillary rheometer in a box!

A precision pump in the instrument controls the sample flow rate as it passes through the capillary.

RheoStream measures the viscosity profile typically every 1-2 minutes: A sample automatically flows into the instrument, and it is being measured in a sequence of steps. When done, a new sample is taken – every sample is 2-5 ml.

This is how it works

By following the numbers on the picture (right) you can follow the progress of a measurement:

① A sample is drawn from process equipment

② The syringe pump controls flow rates in pulses ③

④ A preheater/cooler ensures a steady temperature of the measurement

⑤ The liquid flows through a thin tube (capillary) where…

⑥ … a pressure difference (ΔP) is measured for each pulse

⑦ The instrument computer converts pressure signals into viscosity values…

⑧ …and displays on user interface

This video illustrates the liquid flow in the instrument: https://fluidan.com/3d-video-shows-how-rheostreamworks/