TSI 4040 Series Mass Flowmeter


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The TSI 4040 Series Mass Flowmeters feature a 22mm ISO connection. They can be calibrated for air, oxygen, or nitrogen and have a 0-300 liter per minute range. The 4040 Series are specified as two percent of flow rate reading. One TSI mass flowmeter covers the same range as three percent (or more) of full scale devices, with better accuracy at most points. Fast four-millisecond response ensures accuracy in fluctuating flows. This fast response time is ideal for closed-loop control systems and integrated volume measurements. Low pressure drop minimises flow circuit back pressure and its impact on the system.


  • 4 millisecond flow response
  • High accuracy ±2% of reading
  • High turndown ratio
  • Low pressure drop
  • Convenient analog output of flow rate
  • Versatile digital output of flow rate, volume, pressure, temperature
  • Built-in temperature and pressure compensation


  • Medical
  • Industrial
  • Laboratory



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TSI 1303583 Computer Cable for Flowmeters

TSI 1303584 Analog Cable 8 pin Mini DIN

TSI 1319176 Hard Sided Carry Case for 4040 Series Flowmeters


TSI Filter 22mm ISO Taper

TSI 1602300 Filter .375 inch, FNPT, HEPA Grade

TSI 1602345 Filter .375 inch, FNPT, HEPA Grade, Low Pressure Drop


4040 Flowmeter – 300L/min Air, O2, N2 22mm Tube, 4043 Flowmeter – 200L/min Air, O2, N2 1/2" Tube, 4045 Flowmeter – 300L/min Air, O2, N2 3/4" Tube