High Pressure PVS Rheometer The PVS is a dynamic coaxial cylinder, controlled shear rate rheometer allowing quick and easy viscosity measurements under pressure at temperatures where sample boil-off is a problem. The PVS can be used to simulate process conditions for small fluid samples in a laboratory benchtop environment. Applications include chemical compounds containing volatile materials, oil industry, drilling muds and fracturing fluids, processed foods, polymers and paints. Any test sample requiring absolute viscosity measurement under totally enclosed conditions is a viable candidate. Portable and compact Quick and easy to operate Simulates process conditions Pressure to 1000 psi Temperature range from -40°C to 200°C Shear Rate from 0.004 sec-1 to 4000 sec-1 Wide variety of measurement geometries to accomodate a broad range of test specifications Optional geometries in Hastelloy C for improved corrosion resistance Torque transducer, bearings, and other mechanisms completely sealed from the sample and test environment Outer cylinder rotation for sample stability during measurement Minimum vapor space above sample PC control using Brookfield Rheovision® software Accuracy ±0.5% of span How It Works The outer cylinder (sample cup) is driven by a stepper motor at speeds from 0.05 RPM to 1000 RPM. The inner cylinder (bob) contains an RTD probe on the surface to provide temperature measurement where the shear stress is being measured. Several cup and bob designs with different geometries are available to suit various applications. The unique torque tube design enables the instrument to respond to minute changes in viscosity, mechanically transmitting a rotational torque signal out of the pressure containment area without friction. Thus all electronics, bearings, and other sensitive components are completely protected from the influences of both the sample fluid and its vapor. System Includes: Rheometer sensing unit and power base Over-pressure relief valve Choice of 1 cup and bob/spindle geometry set, 316 stainless steel (B1, B2, B5 cylinders) Desktop computer (PC) Rheovision® software Options: Heating/Cooling bath, controlled by Rheovision® software High temperature wax bath Lap-top computer Measurement geometries constructed from Hastelloy C Extra geometry sets BOB/SPINDLE SAMPLE CUP VISCOSITY RANGE cP (mpa·s) SHEAR RATE (sec-1) SAMPLE VOLUME (mL) VAPOR VOLUME (mL) PVS-B1-D (PVS-B1-D-HC)* 1.7 - 3.45 1.703 N 23 90 PVS-B2-D (PVS-B2-D-HC)* 18.1 -36.3 MM 0.377 N 53 90 PVS-B5-D (PVS-B5-D-HC)* 4.4 - 8.8 MM 0.85 N 40 90 PVS-TAB1-D 0.5 - 1.03 MM 1.0 N 140 200 PVS-TA5B5-D (PVS-TAB5B5-HC)* 0.6 - 1.2 MM 0.85 140 200 MM = 1,000,000 N = RPM *Optional Spindle/Sample Cup in Hastelloy C Rheovision®