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7
Manual measuring
(Viscometer type no. 513 ..)
For manual viscosity measuring operation use constant marked „K".
For measuring, draw the liquid drained into the reservoir (3) back into the pre-run sphere (6) passing the
upper timing mark M1 (4) and the lower timing mark M2. Then measure the flow time between the upper
timing mark (M1) and the lower timing mark (M2). The measurement can be repeated any time.
8
Automatic measuring
(Viscometer type no. 520 ..)
Automatic viscosity measurement systems (AVS) from SI Analytics GmbH replace the manual
measurement of viscosity. Subjective measurement errors are eliminated, the measured times are
available in the data memory and are printed out depending upon the device. To carry out the
measurement, please see the operating instructions for the particular measurement device.
The viscometer is inserted into the fitting out of PTFE of the measuring stand type no. AVS/S-CF. The
time measurement is made in the measurement levels from M1 to M2. Light barriers replace the ring
markers hereby. For automatic viscosity measurement, the constant identified with "AK = ..." is to be used.
9
Viscosity calculation
The seconds contribution given in the table for the kinetic energy correction (HC) 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.
10 Example of evaluation
CANNON-FENSKE VISCOMETER
Type no. 513 10
Capillary no. 100
Constant
Flow time (averaged)
Kinetic energy correction (HC) for 100.00 s = 0.27 s
Kinematic viscosity
*
) previously centistokes [cSt];
2
*
/s]
) directly.
ν = K (t - ϑ)
=0.01500
=100.00 s
ν = K (t - ϑ)
=0.015 (100.00 - 0.27)
=1.495 mm
1 cSt =
11
2
/s*
2
1 mm
/s
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