Bubble pressure tensiometer: Bpt Mobile, Krüss Gmbh

Bubble pressure tensiometer: Bpt Mobile, Krüss Gmbh

Equipment: Bubble Pressure Tensiometer – Bpt Mobile, Krüss Gmbh
Technique:Bubble Pressure Tensiometer
Contact person (Technische Universität Dresden): Ali Shaygan Nia (ali.shaygan_nia@tu-dresden.de), Hans Kleemann (hans.kleemann1@tu-dresden.de)
Responsible: Ali Shaygan Nia (ali.shaygan_nia@tu-dresden.de), Payam Hashemi (payam.hashemi@tu.dresden.de)     


Tasks and Applications

Checking the content of cleaner or wetting agent in a bath is an important QC task in many industrial processes: 

  • Cleaning as a preparation step before coating or bonding
  • Electroplating 
  • Coating of solar cells
  • Etching, e.g. for circuit boards

Measuring Options

  • Bubble Pressure method: Surface tension (SFT) is measured using the internal pressure of a bubble at an immersed capillary
  • Monitoring at a single surface age with evaluation based on predefined limits
  • Continuous measurement of SFT while changing the concentration
  • Determination of the SFT dependent on surface age between 10 and 30,000 ms
  • Temperature measurement and documentation


Serial Number: 30010450
Range of temperature measurement

  • 0 to 100 °C
  • Resolution 0.1 °C
  • Location of temperature measurement sample liquid

Sample Dimensions

  • Min. recommended sample volume 15 mL (sample vessel SV23)

Pressure Measurement

  • Maximum pressure 1250 Pa
  • Precision 2%

Bubble Pressure

  • Results dynamic surface tension vs. surface age
  • Dynamic surface tension at constant surface age
  • Single dynamic surface tension / bath concentration
  • Range (surface tension) 10 to 100 mN/m
  • Resolution (surface tension) 0.1 mN/m
  • Precision (surface tension) 0.5 mN/m
  • Range (surface age) 10 to 30000 ms
  • Resolution (surface age) 1 ms

Precision (surface age) max. 7.5%

Link for additional information: