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Home  >>  Products  >>  Viscosity  >>  Byko-Visc DS Stormer Viscometer

Byko-Visc DS Stormer Type Viscometer

Portable Field Viscometer

The byko-visc DS Stormer Viscometer has a direct digital readout of Krebs units (KU), centipoise (cP), and grams (gm). The instrument rapidly calculates viscosity values.

The digital stormer maintains the rotational speed at 200 rpms in compliance with ASTM D562. The Stormer Viscometer automatically starts and stops the motor shaft rotation by lowering or raising the instrument stand.

Learn more about using a Kreb Stormer Viscometer for Paint and other QC Applications here.


  • Easy to use - automatic rotational speed control
  • Automatically calculates KU, centipose, and gram units
  • Printer interface for test report output
  • Instrument base accessory to fit quart, pint, 1/2 pint containers
  • Calibrated with NIST traceable oils
  • Universal power supply - One model for global use

Technical Data

Technical Data
Range: 40-141 KU; 32-1090 grams; 27-5274 cP*
Resolution: 0.1 KU, 1.0 gm, 0.7 cP
Accuracy: within ± 1 % full scale
Repeatability: within ± 0.5 % full scale
Spindle Speed: 200 rpm, ±0.1 rpm
Voltage: 100 - 230V/ 50-60HZ
Operating Temperature: 10 - 40 °C (50 - 104 °F)
Dimensions: 20 X 11 X 15 in
Shipping Weight: 10 kg (20 lbs)

Viscometer and Viscosity Cup Drain Time Conversion

The three reduced size charts, at left. are only for illustrating this conversion method. Ask for complimentary full size (8-1/2" x 11") Krebs Units Conversion Charts and latest Krebs Stormer literature.

Three Step Conversion Procedure

Step 1: Knowing the Krebs value, convert this value to Centipoise viscosity. On the attached Krebs Units to Centipoise conversion chart, read vertically from the known Krebs unit to the curve and then horizontally to the left to the Centipoise value. Record this value.

Step 2: Convert the Centipoise value for the test material in question to Centistokes. On the attached Centipoise - Centistoke conversion chart, locate the Centipoise value from Step 1 on the vertical scale.Read horizontally to the right from this value to the Weight Per Gallon or Specific Gravity line, estimating values between lines, applicable to the test material in question. From this intersection read directly downward to the horizontal Centistoke scale and record this value.

Step 3: Determine the drain time in seconds for the viscosity cup in question from the Centistoke value from Step 2. For this conversion, refer to the Gardco Viscosity Cup Equivalent Chart or the conversion chart furnished with each Gardco produced viscosity cup. Only viscosity cups accommodating the highest range of viscosity are satisfactory for this conversion as most Krebs measurements are in the range from 500 to 1400 Centistokes.

For satisfactory results, do no use a viscosity cup above its recommended top limit. This conversion is accurate only for Newtonian or near Newtonian materials. Viscosity of materials that deviate greatly from these true liquids may not be “seen” the same by the Stormer and viscosity cup methods of measurement.

Please refer to the appropriate cup conversion chart. If you do not have one please contact us at 954-946-9454.



Prices subject to change    Prices listed in US dollars for domestic shipments within US, Canada, & Mexico only    Export orders require quotations - click here for a quote     For more info call us 1-800-762-2478 or 954-946-9454.
Item Number Item Prices

Stormer Viscometer, 1 paddle spindle, adapter for 1 pint, 1/2 pint containers and operation manual
VI-B8324 Byko-Visc DS Stormer Viscometer $3,199.00
VI-B8340 Krebs Replacement Paddle Spindle 129.00
VI-022510 Krebs Paste Spindle 249.00
PU-G271 Conversion charts for conversion from Kreb units to cup drain times (download PDF) Free
Viscosity Standard Oils
4020 Viscosity Centipoise 350, Krebs Unit KU62 110.00
4021 Viscosity Centipoise 600, Krebs Unit KU73 110.00
4022 Viscosity Centipoise 940, Krebs Unit KU84 110.00
4023 Viscosity Centipoise 1050, Krebs Unit KU87 110.00
4024 Viscosity Centipoise 2000, Krebs Unit KU106 110.00


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