BitUVisc kinematic viscometer

Fully automatic viscometer for highly viscous samples up to 120,000 mm²/s
“Finally an instrument that eliminates the need for the tedious, labour intensive manual loading, measurement and cleaning of high viscosity samples”.
Fully automatic
Highly accuarate
Handles extreme samples
Easy to use
Duplo viscometer tubes

Viscosity measurement compliant to test methods ASTM D445, D446, D2170 and AASHTO T201

The system can process highly viscous samples with viscosities ranging up to 120,000 mm2/s, up to 150°C. It fully complies with ASTM D445, D446, D2170 and AASHTO T201 to test your highly viscous sample.

There are 2 different models available: 110 and 120. BitUVisc 110 features a single thermostatic bath with 1 viscometer tube whereas BitUVisc 120 model holds 2 viscometer tubes in a single bath. All BitUVisc instruments are equipped with auto-sampling, preheating, fully automatic dual solvent cleaning, and drying.

Viscometer tubes are based on the well-known and proven Ubbelohde design. Using specially designed thermal sensors, these tubes allow the detection of fully opaque fluids without any problems or limitations and eliminate the need to use the reverse flow tubes. Therefore, you will be able to complete almost any highly viscous sample test. The standard configuration offers viscosity measurement up to 150°C and sample preheating up to 200°C.

Sophisticated temperature control ensures that measurements are carried out well within the required temperature stability. The system features an innovative single position auto-sampling which provides integrated heating of the sample up to 200°C and uses preheated solvent to effectively clean the viscometer tube. The BitUVisc is fitted with special designed duplo viscometer tubes for unstable samples such as vacuum residues, additives, crude oils, waxes, heavy fuel oils, polymers, and asphalts, which typically show poor determinability when sampled repeatedly. These tubes have 2 measuring sections with a similar tube constant. This allows for an actual duplo determination while only sampling once.

BitUVisc 110 / 120
Measuring range Up to 120,000 mm2/s, up to 150°C
Temperature range 15 – 150°C *
Temperature stability

15°C to 100°C ± 0.01°C *

Up to 150°C, ± 0.03°C

Preheater temperature

Up to 200°C

Timer accuracy

0.001 s

Sample volume

12 ml 

Sample introduction


Solvent consumption

10 - 30 ml per cycle, sample dependent 

Sample throughput

BitUVisc 110: up to 2 measurements per hour **

BitUVisc 120: up to 4 measurements per hour **

Applicable standards

ASTM D445/D446, ASTM D2170 
AASHTO T201, EN 12595

Viscometer type

Ubbelohde based

Duplo Measurement


Sensor type


Built-in preheater


Dual Solvent cleaning




PC software


PC Control

Multiple instruments controlled with 1 PC

Data Export

USB storage device


110 / 120: 38 x 62 x 78 cm (w x d x h) 


54 kg (empty)

Power requirement

10A @ 230 V

*  For temperatures around ambient, an external cooling circulator is required
** Measurements per/hour; depends on viscosity, tube constant, temperature and solvents chosen. Measurement cycles are given for a sample with a viscosity around 50.000 mm2/s @ 40°C.


BitUVisc series optional accessories

The following items are optional accessories and upgrades to the instrument.

Cooling circulator

For measurements, close to ambient (± 8°C), an additional cooling circulator is required to create sufficient offset for the temperature control unit. The bath needs to be fitted with a cooling spiral, to which an external cooling circulator can be easily connected. Complete with tubing and fittings. Cooling circulator will be supplied separately on request.


Omnitek BitUVisc systems operate on clean 5 bar compressed air. If not available on-site a stand-alone version with @ approx. 5 l/min.

Pedestal base

Pedestal base can be supplied from Omnitek for floor-standing installation.

PC & Printer

PC can be supplied locally or from Omnitek. Omnitek supplies a new generation laptop. Minimum operation software should be Windows 7.

Any kind of printer can be used if the instrument is connected to a PC by software. Printer can be supplied locally or from Omnitek. Omnitek supplies the latest model laser printer.

ASTM Thermometers

All BitUVisc units can be equipped with ASTM thermometers. The recommended thermometers that can be supplied are the modern digital contact thermometers (DCT), used at multiple temperatures.

Glass sample cups

For temperature above 105°C, glass sample cups are required for the sample measurement.


  • Applicable for fuels, base oils, formulated oils, highly viscous samples tests of vacuum residues, additives, crude oils​waxes, heavy fuel oils, polymers, and asphalts
  • Meets all ASTM, EN, ISO, DIN, AASHTO T201, EN 12595, and standards related to kinematic viscosity standards
  • Extremely accurate temperature control
  • Extremely accurate flow-time measurement independent of fluid type
  • Viscometer filling by vacuum method
  • Innovative and efficient viscometer tube cleaning allowing cross contamination free operation
  • Easy viscometer tube exchange
  • Chemically resistant to an extended range of fluids and solvents
  • Compact design

This product is compliant with the following test methods:

  •  ASTM D445 
  •  ASTM D446 
  •  ASTM D2170 
  •  AASHTO T201 
  •  EN 12595
Bitumen (Asphalt Plants)
Heavy Fuel Oils (HFO)

Road Construction & Paving

Residual Fuel Oils (RFO)

Additive Manufacturers

Vacuum Residues

Lubricant Manufacturers

Bitumens (Asphalts)

Third Party Labs

Waxy samples
Crude Oils 

Research & Development Labs

Lubricating oils 

Quality Control Labs


For other fluids / solutions please send your inquire


OmniTek - BitUVIsc.jpg


BitUVisc 100 Series



ASTM D445 / D2170 single bath automatic viscometry system, used for highly viscous sample testing. Models manufactured under this serie: BitUVisc 110 and BitUVisc 120.

Request more information about our systems for your highly viscous sample test

Make use of these methods using the most advanced technical developments with the Omnitek specialized equipment for your lab. We are based in The Netherlands and will gladly assist you as your viscometer manufacturer in making the most of the ASTM D445 and ASTM D2170 methods for your quality controls. If you are instead looking for a system that processes lower viscosities, we recommend our U-Visc system. Request a brochure or get first-hand experience with our systems through an online demo to learn more about our products. If you have any questions regarding our services and tailor-made products, please contact us by calling +31 (0)182 - 302990 or send an email to