Soap Film Flowmeters

Primary Standards for Calibrating Sample Pumps

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  • Overview
  • Features
  • Specifications
  • Applications
  • Support

A film flowmeter measures flow rate based on the unchanging properties of the measuring apparatus. The pump to be calibrated pulls air through a volumetric glass tube where a flat soap fi lm bubble is interposed into the flow path. As the airflow causes the film to move up the volume marks, travel time is measured with a stopwatch. The flow rate can be calculated using the travel time and tube volume or looked up on a flow chart.

  • Primary standards
  • Simple to use
  • Sample contacts only glass and stainless steel
  • Calibration lines encircle the tube for easy reading
Model Model 303 Portable Flowmeter Kit 
Range 5 to 500 ml/min
The SKC 303 Portable Flowmeter Kit contains all of the equipment, except a stopwatch, required for calibrating low flow personal sample pumps and detector tube pumps. The complete kit weighs only 3 pounds (1.4 kg) and includes a 100-ml buret flowmeter, film solution, operating instructions, flow charts, and a removable carry case. Calibration lines for 90, 95, 105, and 110 ml are also on the buret allowing for the calibration of detector tube pumps.


Model Model 311 Laboratory Flowmeter Kit 
Range 300 to 3000 ml/min
The SKC 311 Laboratory Film Flowmeter Kit consists of a glass tube with red calibration lines at specified volumes, a squeeze bulb to contain sufficient soap film solution for flow measurement, an adapter to accommodate either vacuum or pressure sources, a stopper and connecting tubing, a tripod stand, film solution, and operating instructions. The SKC 311 Laboratory Film Flowmeter Kit provides quick and accurate flow determinations at specified flow rates.



  • Calibration of air sampling pumps