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Fluid viscosity
The performance of a turbine flow meter can be affected by the viscosity of the fluid measured. Our turbine flow meters
are calibrated at between 18 and 26 cSt as standard (a mean viscosity of 21 cSt), which is the typical kinematic viscosity
for a hydraulic fluid operating at 50 °C. The kinematic viscosity of all hydraulic fluids is related to the fluid temperature,
and the table below shows the effect 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 OTC Technical Services for further information.
Table showing kinematic viscosity (cSt) of different mineral oils at specific temperatures
10
Temp °C
ISO15
0
85.9
10
49.0
20
30.4
30
20.1
40
14.0
50
10.2
60
7.7
70
6.0
80
4.8
90
4.0
100
3.3
ISO 15, 22, 32, 46 and 68 based on typical figures for the Esso Nuto range of HM
oils. ISO 37 based on Shell Tellus HM oil.
Fluid type
ISO22
ISO32
ISO37
165.6
309.3
449.9
87.0
150.8
204.7
50.5
82.2
105.5
31.6
48.8
59.8
21.0
31.0
36.6
14.7
20.8
23.9
10.7
14.7
16.5
8.1
10.9
12.0
6.4
8.4
9.1
5.2
6.6
7.2
4.3
5.5
6.0
ISO46
ISO68
527.6
894.3
244.9
393.3
127.9
196.1
73.1
107.7
44.9
63.9
29.4
40.5
20.2
27.2
14.6
19.2
11.1
14.3
8.7
11.1
7.1
8.9
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