Surface Tension Measurement » LAUDA Ring/Plate-Tensiometer TD 1 C


Easy determination of surface tension

The TD 1 C model works with Du Noüy ring and Wilhelmy plate according to international standards (DIN 53914, ISO 304, ASTM D971). Furthermore, the density, according to the Archimedes' principle, as well as smaller weights can be measured due to a newly-developed, even more powerful forcemeasuring cell with a considerably enlarged measuring range. The measuring table with the sample stage can be moved steadily by means of ergonomic adjusting screws, like a microscope, in order to lower the Wilhelmy plate to the sample surface or in order to determine the maximum force during the ring measurement.

By means of the high-resolution display of the remote Command control, the increase in wetting force during withdrawing of the ring can be followed and the maximum force can also be found without detaching the lamella. The value displayed in the maximum is automatically corrected according to Zuidema and Waters, and thus corresponds to the surface tension of the measured liquid in mN/m. At the touch of a button, the measured value and all parameters can be either saved or directly printed out on an optional protocol printer.

General advantages

  • Easy to operate
  • Transmits a direct feel for surface and interfacial tension
  • Specially suited for beginners and in educational settings
  • Digital display of surface and interfacial tension
  • Simple selection of measuring methods according to Du Noüy-ring, Wilhelmy-plate, Lenard frame or density measurement
  • Calibration with standard weights

Measuring features

  • High resolution (± 0.1 mN/m, ± 1 mg) and enlarged measuring range up to 300 mN/m or 5 g
  • Automatic maximum recognition
  • Print-out of the measuring values (surface / interfacial tension, density) on an optional printer at the touch of a key
  • Automatic correction of measuring values (according to Zuidema and Waters)
  • Semi-automatic calibration at three levels of precision with calibration weights
  • Input of sample dimensions possible
  • Storage of up to 500 measurements and the accompanying parameters
  • Numerical sample description determined by the user
  • Displaying of different measuring values and modes
  • Easy handling

Measuring desk

The measuring desk includes the high-resolution forcemeasuring cell and the lifting device for the manual positioning of the sample stage. Various standard test beakers with a diameter of up to 8 cm can be inserted into the large sample compartment accessible from all sides. The samples can be brought to the correct temperature by using a LAUDA RE 104 thermostat, for example, connected to a double-walled glass thermostating vessel.

Remote control Command

This handy, removable control unit enables the input of the measurement parameters and assumes the evaluation and representation of the measurement results. The large, high resolution graphic display takes over the menu-driven user guide, and displays single measurements and results at the touch of a button. The remote control with its self-explanatory menu-driven operation offers the optimum degree in user-friendliness.