hts-VROC™ Viscometer

-High Temperature, High Shear Viscosity

Understanding Fluid Behavior in High Temperatures

Because viscosity is heavily dependent on temperature, RheoSense includes a precise temperature controller with all VROC® units to provide thermal stability to within +/-0.07 °C. The standard VROC® components and temperature control system allow for operation from 4°C to 70°C, but with specific applications, such as those following a pre-existing ISO or ASTM method, the viscosity measurement is required to be performed at a specific elevated temperature. For example, in the case of lubricants, a specific shear rate is required to mimic the conditions within the journal bearings of internal combustion engines under operating conditions.

To meet this requirement, RheoSense introduced the hts-VROC™ model. This system provides the same features and specifications as m-VROC™, but hts-VROC™ provides the added capability to measure at temperatures as high as 105 °C.

Specification

hts-VROC™ Viscometer— High Temperature Viscosity Measurements
Understanding Fluid Behavior in High Temperatures

hts-VROC™ provides the same features and specifications as m-VROC™, but hts-VROC™ provides the added capability to measure at temperatures as high as 105 °C.

Viscometer Specifications 

Minimum Sample Volume: 25 µL        
Wide Dynamic Viscosity Range: 0.2 - 100,000 mPa-s (or cP)
Shear Rate Range: 0.5-1.4M s-1
Shear Rate and Temperature Rate Sweeps 
Temperature specification of 4 °C – 105 °C
Temperature Stability ~+/- 0.07 °C
No Evaporation – No Air-Liquid Interface
Characterization of Newtonian and Non-Newtonian Solutions
Accuracy up to 2% of Reading
Repeatable Measurement up to 0.5% of Reading
Typical Test Time will Take Less than One MInute


High Shear and High Temperature Viscosity
High-temperature and high-shear viscometer, hts-VROC® 

Our high-temperature and high-shear unit, hts-VROC®, exploits VROC® (Viscometer/Rheometer-On-a-Chip) technology to characterize engine oils under conditions similar to those in combustion engines. hts-VROC® provides a full shear rate spectrum of your synthetic oil viscosity as a function of temperature. 

Real-World Testing Range

Engine oils play a key role in the lubrication and performance of internal combustion engines. Lubricants reduce reduce wear on moving parts, inhibit corrosion and improve sealing and cooling. Characterizing lubricant properties is fundamental to properly establishing performance and degradation under use. Our new system provides the features and specifications of the revolutionary m-VROC® viscometer, with the added capability of testing at temperatures as high as 105°C (with 125 °C available upon request).

Explore Our Test Results

In this technical application note, we demonstrate the suitability of hts-VROC® to characterize engine oils, and other complex fluids, over a wide range of shear rates and temperatures. VROC® technology is a powerful tool in rheological characterization of fluids at high shear rates that are not accessible by conventional rheometers and viscometers. As an example of hts-VROC® capabilities, we present results for two new, multi-grade, synthetic engine oils, and one used oil.

hts-VROC® features include:

Temperature Control: 4 - 105 °C 
Viscosity Range: 0.2 - 100,000 mPa-s.
Shear Rate Range: 0.5 - 1,400,000 1/s.
Accuracy: 2% of reading.
Repeatability: 0.5% of reading.