CMRV-4500 Mini-Rotary Viscometer

For Low Temperature Pumping Viscosity of Engine Oils
ASTM D4684, ASTM D3829, ASTM D6821*, ASTM D6896, SAE J300

The CMRV-4500 is a semi-automated mini-rotary viscometer for measuring low-temperature pumping viscosity from –5 °C to –40 °C. It has 9 test cells and is thermoelectrically-cooled via an external air/water heat exchanger.

Common Applications

  • Drive line lubricants
  • New engine oils
  • Used automotive oils

Reliable and accurate results

  • Meets requirements of ASTM D4684, ASTM D3829, ASTM D6821* and ASTM D6896
  • Meets latest SAE J300 specifications for low-temperature pumpability
  • Reliable and accurate temperature control from −5 °C to −40 °C
  • High resolution optical encoder for digital detection of yield stress and viscosity
  • Dry gas purge regulator maintains a frost-free environment throughout the precise, microprocessor-controlled cooling cycle

Compact, efficient design

  • Benchtop unit measures yield stress and viscosity of drive line lubricants and engine oils
  • Environmentally friendly (no freon gas), solid-state thermoelectric cooling removes temperature gradients to provide enhanced precision and uniform temperature across all 9 test cells
  • Air/water heat exchanger provides a quiet, low-maintenance system without a need for potentially hazardous refrigerants
  • High performance rotors with locking pins and carbon fiber shafts minimize test cell heat transfer
  • Integrated drawer unit for convenient storage of CMRV accessories including rotors, weights, and cell caps.

Semi-automated testing

  • Windows®-based VISCPRO® software offers preconfigured profiles for each SAE-specified oil grade and referenced ASTM method as well as the option for custom cooling profile configuration
  • Software provides graphical representation of cooling profiles
  • Viscosity and yield stress are automatically calculated and stored or exported via built-in LIMS output
  • Optional multi-unit interface kit permits networking and control of up to four CMRV units from a single PC

* With optional drive line rotor kit

Dimensions (W × D × H) Unit: 31.7 cm × 26.0 cm × 48.9 cm (12.5 in × 10.25 in × 19.25 in)
Air/water heat exchanger: 47.0 cm × 34.8 cm × 34.0 cm (18.5 in × 13.7 in × 13.4 in)
Weight Unit: 18.6 kg (41 lb)
Air/water heat exchanger: 31.8 kg (70 lb)
Shipping dimensions (W × D × H) Box 1: 88.9 cm × 88.9 cm × 88.9 cm (35 in × 35 in × 35 in)
Box 2 (recirculating cooler): 81.3 cm × 61.0 cm × 106.7 cm (32 in × 24 in × 42 in)
Shipping weight Box 1: 68.0 kg (150 lb)
Box 2: 31.8 kg (70 lb)
Maximum thoughput 9 samples per test cycle
Automated sample capacity 9
Temperature range and accuracy −5 °C to −40 °C, ± 0.1 °C
Minimum sample volume 10 mL per test
Operating conditions 15 °C to 30 °C, 10% to 75% relative humidity (non-condensing), Installation Category II; Pollution Degree 2
Electrical specifications 100 Vac, 50/60 Hz; 115 Vac, 50/60 Hz; 230 Vac, 50/60 Hz; 400 watts power consumption (unit); 1100 watts power consumption (AWHE)
Compliance CE Mark; EMC directive (2004/108/EC); Low voltage directive (2006/95/EC); HI-POT (1900 Vdc, 60 sec.); ROHS


Link to Downloads page for Software and Firmware 

CMRV-4500 Mini-Rotary Viscometer consists of the viscometer unit, air/water heat exchanger, 9 test cells, N105B oil viscosity calibration standard, a high precision digital thermometer with probe, cell caps and data storage/management software. Computer sold separately. Description  Part #
100 Vac, 50/60 Hz 9728-R21
115 Vac, 50/60 Hz 9728-R22
230 Vac, 50/60 Hz 9728-R23




Thread with loop and ring set (9 pc)


Rotor Collar Set, For 1 Cell


Replacement rotor


High-performance drive line rotor kit (1)


High-performance drive line rotor kit (9)


Spare parts kit CMRV-4500 (for one year)






Low Temperature Viscosity Standards (General, CCS and CMRV)

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