Calibrating The Instrument And The Capillary; Calibration With Labdesk Or The Bp50; Reference Liquid - kruss BP50 User Manual

Bubble pressure tensiometer

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3. Fit the BP50 into the opening of the arm.

4. Place the sample vessel in the recess on the base plate of the lifting device.

5. Immerse the capillary by lowering the lifting device with the help of the

adjusting screw.

SPA C SPA C SPAC SPAC

3.6

Calibrating the instrument and the capillary

When calibrating the instrument, the ratio between the measured bubble pressure

and the surface tension is determined using a reference liquid. The calibration must

be carried out for every new capillary.



Calibration can usually be carried out by means of a manual measurement.

3.6.1

A calibration with the help of the LabDesk software must be carried out for



every change in the surface tension of the reference liquid ( LabDesk manual).

3.6.2

A reference liquid with known surface tension is required for the calibration. As a

general rule water is used.

The surface tension of the reference liquid must be independent of the surface

age.

The water used must be free from surface-active substances. Do not use water,

which has been demineralised with an ion exchanger, for measurement or for

cleaning. This can be contaminated with surfactants.

SPAC SPAC SPAC SPA C

Operating the BP50

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