Quantcast Figure 3-1.Saybolt viscometer.

Figure 3-1.—Saybolt viscometer. used  to  express  the  fluid’s  viscosity,  in  Saybolt universal  seconds  or  Saybolt  furol  seconds. The   glass   capillary   viscometers,   shown   in figure  3-2,  are  examples  of  the  second  type  of viscometer  used.  These  viscometers  are  used  to measure  kinematic  viscosity.  Like  the  Saybolt viscometer, the glass capillary measures the time in  seconds  required  for  the  tested  fluid  to  flow through the capillary. This time is multiplied by the  temperature  constant  of  the  viscometer  in  use to  provide  the  viscosity,  expressed  in  centistrokes. The   following   formulas   may   be   used   to convert  centistrokes  (cSt  units)  to  approximate Saybolt  universal  seconds  (SUS  units). For  SUS  values  between  32  and  100: For SUS values greater than 100: Although  the  viscometers  discussed  above  are used in laboratories, there are other viscometers in the supply system that are available for local use.  These  viscometers  can  be  used  to  test  the viscosity of hydraulic fluids either prior to their being  added  to  a  system  or  periodically  after  they have  been  in  an  operating  system  for  a  while. Figure 3-2.–Various styles of glass capillary viscometers. 3-2


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