Two-Speed Viscometer Model 280 Part No. 28000
The Model 280 Viscometer is a precision- built, multiple-speed rotational viscometer designed specifically for field testing the rheological properties of drilling fluids. The viscometer is operated at two rotational shear rates, and the readings obtained are used to determine the plastic viscosity and yield point of the drilling fluid being tested.
The viscometer is supported on a counterbalanced telescoping frame that provides easy adjustment of the rotor depth of the drilling fluid sample. It is hand-powered by turning a small crank that drives a rotor at a preselected constant speed through a precision gear train governor. Rotor speeds of either 300 or 600 rpm are obtained by setting the position of the speed control lever. A third position of the speed control lever is available for operating the rotor at a higher speed for stirring the drilling fluid sample.
Gel-strength measurements are read directly from the deflection scale. When making gel-strength measurements, force is applied manually by turning the gel knob and observing the maximum reading on the deflection scale before the gel breaks.
No field maintenance is required. It is the lightest field instrument available for determining plastic viscosity and yield point.
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