PVS Rheometer for High Pressure and High Temperature
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.
Major Benefits And Features
Pressure to 1000 psi
Temperature to 200°C
Shear Rate from 0.004 1/sec to 4000 1/sec
Wide variety of measurement geometries to accomodate a broad range of test specifications
Quick connect spindle and chamber for easy test set up
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
Operating Principle
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.
With variable speed capability under PC control, the PVS provides viscosity and temperature data under very precise shear rate conditions. Multiple rheogram overlays can be placed on a single screen and printed out.
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.
JD Instruments, Inc., P.O. Box 19463, Houston, TX 77224-9463. Tel: 713-468-8087; Fax: 713-468-4254.