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5
Calculation of viscosity
The seconds contribution given in the table for the Hagenbach Corrections is to be subtracted from the
measured flow time for the various capillaries. Intermediate values can be interpolated.
With absolute measurements, the corrected flow time multiplied by the viscometer constant K, produces the
kinematic viscosity [mm
The viscometer constant K is mentioned in the enclosed production certificate.
6
Example of calculation
Micro Ostwald Viscometer
Type No. 516 10
Capillary I
Constant
Flow time (averaged)
Hagenbach Correction for 40,00 s
Kinematic viscosity
* previously centistokes [cSt];
7 Table of Hagenbach Corrections (HC) for:
Micro Ostwald Viscometers
Type No. 516 .., 517 .., 518 ..
1
:
Correction seconds
Flow time [s]
30
35
40
45
50
55
60
65
70
75
80
1)
The correction seconds stated are related to the respective theoretical constant.
2
/s]* directly.
ν = K (t - ϑ)
ϑ = 0.18 s
ν = K (t
1 cSt = 1 mm
8
= 0.0100
= 40.00 s
ϑ)
-
–
= 0.0100 (40,00
0,18)
= 0.3982 [mm
2
/s]*
2
/s
Capillary no. I
0.32
0.23
0.18
0.14
0.11
0.09
0.08
0.06
0.06
0.05
0.04
Capillary no. Ic
0.05
0.03
0.03
0.02
–
–
–
–
–
–
–
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