Requires very little field maintenance, and is the lightest field instrument available for determining plastic viscosity and yield point.

 

The Model 280 is a hand-powered, two-speed rotational Rheometer designed specifically for field testing the rheological properties of drilling fluids. A small crank drives the rotor at a pre-selected constant speed through a precision gear train governor. Rotor speeds of 300 or 600 are obtained by setting the position of the speed control lever. Measurements are read directly from the deflection scale. The readings obtained are used to determine the plastic viscosity and yield point of the test fluid.

 

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.

The API recommended Torsion Spring, Rotor, and Bob are supplied with the Model 280 Rheometer. A stainless steel sample cup is also included. An optional High Impact plastic carrying case is available.

 

The Rheometer Cup Heater allows measuring viscosity at elevated temperatures. Heater Cups are fitted with a removable stainless steel sample cup for easy cleaning, and are designed to fit snugly on the Rheometer base. The Thermostat control allows heating up to 200°F (93°C).