Rotational viscometer with direct-coupled torque transducer - no bearings
The Grace Instrument M5600 HPHT Rheometer is a true Couette, coaxial cylinder, and rotational rheometer, operating at high pressures up to 2,000 psi and temperatures up to 500°F. The unit incorporates a direct drive between the bob shaft and the torque transducer, which eliminates momentum of inertia errors usually associated with magnetically coupled torque transducers. Thus, the torque transducer can respond quickly and consistently to changing bob shaft torque, resulting in lower maintenance costs while allowing continuous testing of corrosive samples.
The only true rheology measurement under pressure
Other rheometers often utilize a magnetic coupling across a pressure vessel to rotate a magnet on a bob shaft, using metal or air bearings, in order to measure viscoelasticity; however, when the tested fluid possesses different G'/G" values compared to the calibration fluid, the G'/G" measurement will be invalid. A calibration fluid with known G'/G" values must be tested properly to provide a baseline for viscoelastic measurement. The M5600 HPHT Rheometer, also available with an optional viscoelastic module that performs viscoelasticity tests to derive G', G”, G* and phase angle. This vastly increases the researcher's ability to predict the behavior of fluids, such as their capacity for suspending and carrying solids (weight material sag, drill cuttings transport, proppant transfer, etc.)