U-Visc kinematic viscometer

Full range automatic viscometry systems for lubricants and other petroleum products
“The U-Visc viscometry system was designed with full ASTM D445 compliance in mind, combined with low solvent consumption, high unattended throughput, ease of use and reliability”.
Fully automatic
Highly accuarate
Autosampler carrousel
Vacuum or pressure sampling
High throughput
The Omnitek U-Visc is the next generation of completely automatic viscometry systems.

The system combines several unique features, making it the instrument of choice in many applications, ranging from QC to R&D to used oil analysis. While offering full compliance with ASTM D445/446, the specially designed viscometer tubes cover a 100-fold range, e.g. from 1 to 100 mm2/s. The tubes are based on the well-known and proven Ubbelohde design, but only require 8-16 ml of sample and approx. 12-15 ml of solvent for cleaning. Available with single or dual solvent cleaning, the instrument measures kinematic viscosity in Newtonian fluids like lubricants, fuels or dissolved plastics between 0.15 and 25,000 mm2/s.

Designed to be versatile and flexible, yet easy use. Different models are available range from 1 bath with 1 or 2 viscometer tubes, up to 2 baths with 1 or 2 viscometer tubes per bath, where ach bath works independently. Sophisticated temperature control ensures that measurements are carried out well within limits specified by ASTM D445. Each bath features a 32-position sampling tray (16 samples per tube), allowing completely unattended operation. Depending on the viscosity of the sample, the instrument can process up to 40 measurements per hour, satisfying even the needs of high volume labs running several hundred samples per day.

Samples can be introduced using vacuum or pressure. The latter avoids evaporation of sample, which can be a point of concern in some dilute viscosity applications. Viscometers are easily exchanged in minutes instead of hours, minimizing downtime. All surfaces of the viscometer tubes, including the outside bottom, which is in contact with the sample, are thoroughly cleaned and dried using solvents and air.

U-Visc 110 / 120 / 210 / 220
Measuring range 0.15 – 25,000 mm2/s @ 40°C
Temperature range 15 – 150°C *

Temperature stability

15°C to 100°C ± 0.01°C *
Up to 150°C, ± 0.03°C 

Timer accuracy

0.001 s

Sample volume

8 ml - 16 ml 

Sample introduction

Vacuum / Pressure

Solvent consumption

10 - 12 ml per cycle / 12 - 15 ml per cycle (single / dual)

Sample throughput

U-Visc 110: up to 10 measurements per hour **

U-Visc 120: up to 20 measurements per hour **

U-Visc 210: up to 20 measurements per hour **

U-Visc 220: up to 40 measurements per hour **

Applicable standards

ASTM D445, D446, D2270, ISO3104, ISO3105, IP 71, ISO 2909, DIN 51562.

Viscometer type

Ubbelohde based 

Sensor type

Thermal / Optical

Optional preheater


Optional duplo measurement


Dual Solvent cleaning




PC software


PC control

Multiple instruments controlled with 1 PC

Data Export

USB storage device

Dimensions / Weight

U-Visc 110 / 120: 38 x 62 x 78 cm (w x d x h) / 54 kg (empty)

U-Visc 210 / 220: 75 x 62 x 78 cm (w x d x h) / 92 kg (empty)

Power requirement

U-Visc 110 / 120: 10A @ 230 V

U-Visc 210/ 220: 16A @ 230 V

* For temperatures around ambient, an external chiller is required
** Measurements per hour; depends on viscosity, tube, temperature and solvents 

Optional accessories & upgrades

Following items are optional accessories and upgrades to the instrument.

Sample pre-heater

All U-Visc versions can be equipped with a sample pre-heater unit suitable to heat up fluids and solids from ambient up to 120 °C (controllable). Sample pre-heating is applicable to every tube, so ultimately a U-Visc 220 may be equipped with 4 sample pre-heaters.

Cooling circulator

For measurements close to ambient (± 8°C), an additional cooling circulator is required to create sufficient offset for the temperature control unit. Baths contain 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 U-Visc systems operate on clean 5 bar compressed air. If not available on-site, you require a stand-alone version with minimum 5 bar @ 5 l/min for the U-Visc 100 series and @ 7.5 l/min for the U-Visc 200 series.

Pedestal base

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

PC & Printer

Any kind of PC can be used. PC can be supplied locally or from Omnitek. Omnitek supplies a new generation laptop. Minimum operation software should be Windows 7. PC should have RS232 or USB port (RS-232 adapter comes with Omnitek software).

Any kind of printer can be used if 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 U-Visc 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. 

  •  Applicable for fuels, base oils, formulated oils, and other petroleum products.
  •  Fully automatic
  •  Sample carrousel
  •  Meets all ASTM, EN, ISO and DIN standards related to kinematic viscosity 
  •  Extremely accurate temperature control
  •  Extremely accurate flow-time measurement independent of fluid type 
  •  Viscometer filling by either vacuum or pressure method
  •  Little sample volume / little solvent consumption
  •  High throughput; up to 10 measurements per bath per tube per hour
  •  Innovative viscometer tube cleaning allowing cross contamination free operation
  •  Easy viscometer tube exchange
  •  Suitable for petrochemical fluids and diluted solution viscosity samples
  •  Chemically resistant to an extended range of fluids and solvents
  •  Multiple versions available covering a wide variety of requirements
  •  Compact design
  •  Optional duplo viscometer tubes for unstable samples

This product is compliant with the following test methods:

  •  ASTM D445 
  •  ASTM D446 
  •  DIN 3104 
  •  DIN 3105
  •  IP 71
Petroleum Based Samples
Other Sample Types


Lubricating Oils

Fatty Acids

Terminals (Fuel Distribution)

Lubricant Manufacturers Base Stocks  

Additive Manufacturers

Industrial Oils


Condition Monitoring Labs

Transmission Oils


Third Party Testing Labs

Hydraulic Fluids


Research & Development Labs

Used Oils


Quality Control Labs

Waste Oils


Military Labs

Crude Oils


Power Plants

Fuel Oils








Bio Fuels



Marine Fuels


Chemical Plants

Waxy samples


Iron & Steel


Pulp & Paper 










For other fluids / solutions please send your inquire