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Technical information
All flow meters are calibrated at a mean viscosity of 21 cSt using ISO32 hydraulic mineral oil to ISO11158 category HM. Special
calibration is available over a custom flow range or at a different viscosity, please contact sales to discuss your application.
10.0
Fluid viscosity
The performance of a turbine flow meter can be affected by the viscosity of the fluid measured. The kinematic viscosity
of all hydraulic fluids is related to the fluid temperature and the table on the next page shows the affect of temperature on
the kinematic viscosity of a range of typical grades of hydraulic oil.
The shaded area of the table shows the range of viscosities that can be measured by a flow meter with standard
calibration with minimal effect on the accuracy (less that ± 1% FS).
Flow meters can be specially calibrated at a different viscosity to the standard or we can advise on the expected error
when the flow meter is used at other viscosities, please contact sales for further information.
Pressure Drop Chart
Hydraulic Oil Viscosity 21 Centistokes
5.0
CT/LT15
1.0
0.5
5
10
CT/LT600, CT/LT750
CT/LT800
CT/LT300, CT/LT400
CT/LT60
CT/LT150
CT/LT1500
50 100
500 1000 2000
Flow (lpm)
Note:
1 UK gallon = 4.546 litres
1 US gallon = 3.785 litres
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