• Mini-Rotary Viscometer

Mini-Rotary Viscometer

Determines the measurement of the Yield Stress, Apparent Viscosity and Borderline Pumping Temperature (BPT) of engine oils. Borderline pumping temperature is a measure of the lowest temperature at which an engine oil can be continuously and adequately supplied to the oil pump inlet of an automotive engine. Provides a correlation between the temperature at which the viscosity of engine oils reaches a critical value and the borderline pumping failure temperature in engines at the test method specified shear stress.

  • Testing capacity of up to 10 samples
  • Microprocessor temperature controllers store all testing profiles in memory
  • Unique design is fully self-contained - no external refrigeration or heating apparatus needed
  • Advanced direct refrigeration technology eliminates the need for liquid cooling mediums such as methanol
  • Removable test cells allow for easy cleaning, sample agitation and advance sample preparation
  • New rotor design eliminates possible interference with water and ice
  • Internal hermetic refrigeration system provides direct instant cooling
  • Power-saver feature allows testing profile to resume in the event of a brief power interruption
  • Internal gas system provides a continuous blanket of dry gas over samples to eliminate moisture buildup
  • Rotor stator rack supplied for convenient cleaning, drying, and storage
  • Safety features include high pressure cutout and high temperature limits
  • 5 Rotor stator sets required for instrument. Additional sets up to 10 available
  • Software Package Required
  • Rotor/Stator Holding Rack
  • Stator Insertion/Removal Tool
  • Moisture Cover
  • Set of Weights and Strings
  • Port Plugs for unoccupied ports
  • Air Filter Dryer and Desiccant
  • Calibration and Certification

Conforms to the specifications of: 


In accordance with the specifications of: ASTM D3829, D6821*, D6896

* With available Drive Line equipment sold separately

Cabinet Material: Stainless steel and durable thermoplastic

Temperature Range: +80°C to -40°C (176°F to -40°F)

Bath Design: Solid, direct cooling without liquids

Cooling Rate: Single Unit: 5.0°C per minute maximum

Refrigerant: R-507

Compressor Size: 1/3 Horsepower

Temperature Control: +/- 0.1°C, digital readout

Heating Capacity: 600 Watts

Testing Capacity: 10 samples

115V 50/60Hz, 15A
220V 50/60Hz, 7A

WxDxH, in.(cm): 15.5x12.5x13.5 (39x32x34)
Net Weight: 105 lbs (47.6 kg)

  • K38500-3 Rotor/Stator Set (1 Set) - up to 5 additional sets can be added
  • K38500-4 Rotor/Stator Set (5 Sets) - Required
  • K38500-10 LNP-5 Reference Oil (Pint)
  • K38500-SFW MRV Software Package - Required
  • K38500-17 Laptop