Flow measurement of viscous liquids

Flow measurement of viscous liquids

Oils and other viscous liquids (e.g. lubricants, paints, food) change their viscosity depending on the temperature. This strong non-linear dependence of the kinematic viscosity requires special flow meters / flow monitors for flow measurement / monitoring. Up to now, expensive volume measuring devices have been used to reliably measure and monitor viscous liquids.

Floats are the much cheaper alternative to volume flow devices. They are viscosity-compensated and are suitable for use in oils and other viscous liquids. Our viscosity-compensated variable area flow meters / monitors keep their accuracy in a viscosity range from 30 to 600 cSt. Changes in temperature or pressure in this area do not affect the measuring accuracy.

With the following device selection, we offer a wide range of devices for the display and monitoring of viscous media:

Overview of viscosity-compensated flow meters and monitors

  Flow monitors Flowmeters Measuring ranges    Compressive strength Extended resolution EX approval according to ATEX (option)
DKG-1 x x 0.01 - 0.8 l/min… 30 - 90 l/min 10 bar   x
DKG-2 x x 0.5 - 1.7 l/min… 2.5 - 8.0 l/min 16 bar    
DKM-1 x   0.5 - 1.5 l/min… 35 - 110 l/min 300 bar   x
DKM-2 x  

0.5 - 1.5 l/min…
2 - 7 l/min

350 bar   x
DKM/A-1 x x 0.5 - 1.5 l/min…
35 - 110 l/min
300 bar   x
DKM/A-2 x x 0.5 - 1.6 l/min…
2 - 7 l/min
350 bar   x
DKME x   1 - 20 l/min…
15 - 80 l/min
300 bar x x
DKME/A x x 1 - 20 l/min…
15 - 80 l/min
300 bar x x
  • Due to the use of a return spring, all devices work regardless of their position.
  • The robust float devices have a high compressive strength. The stainless steel versions can be used up to 350 bar.
  • As standard, the devices can be used up to a media temperature of 120 ° C. High temperature versions allow use up to 160 ° C.
  • The floats type DKME and DKME / A have an extended measuring range without changing the small lengths of 130mm or 152mm.
  • All devices are available with or without reed contact.
  • Electrical outputs can be selected (4-20mA or 0-10V).
  • Explosion-proof contact designs according to ATEX are optionally available.

Our viscosity-compensated floats are very often used in mechanical engineering, central lubrication, circulating oil lubrication and transformers.


The floats DKG and DKM / A can also be connected in series in combination with volume flow blocks VSB in order to be user-friendly adjustable in a central location. This combination is very often used in central lubrication systems.

Schmidt Mess- und Regeltechnik offers viscosity-compensated floats in a wide variety. Special designs for your individual applications are also available.
Our devices are very economical. Standard versions are available from € 80.

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