Air and oxygen flow measurement inside the ventilator

Implementation: Sensirion SDP31 + injection molded flow element

• SDP31 is low cost and mass produced (unlike SFM3000)
• Measures mass flow
• No drift, no offset: zero-point accuracy 0.1 Pa, zero point repeatability 0.03 Pa
• Low pressure drop (SFM3000):
  • < 20 Pa @ 60 slm and 150 Pa @ 200 slm (w/o mesh)

Proximal flow measurements

Implementation: Sensirion SDP810 + variable or fixed orifice proximal flow sensor

• SDP810 is low cost and mass produced
• the same thermal-based measurement, no drift, no offset