I'm a software developer, who wants to create a monitoring system for an industrial airflow system. The airflow of the system is huge - between 15 and 20 cubic liters per minute. Here is my problem, the strongest airflow sensor which could be connected to a microcomputer, is with capacity 300 SLPM which is 0.3 cubic liters per minute.

In summary I have the following questions:

  1. Is there a way to use such a sensor to measure airflow which is much much bigger?
  2. Maybe there is a way to decrease the airflow in a parallel connection where to put the sensor, measure it, than do some calculations in order to infer the real airflow?
  • $\begingroup$ Is the 300SLPM really 0.3 metres cubed per minute? $\endgroup$
    – Solar Mike
    Commented Jun 8, 2018 at 9:03
  • 1
    $\begingroup$ There is an error with your units of measurement, they should either be litres per minute or cubic metres per minute. You cannot have cubic litres. A litre is 1000 cubic centimetres, so it is already a cubic measurement. $\endgroup$
    – Fred
    Commented Jun 8, 2018 at 9:32
  • $\begingroup$ I don't understand the claim hat you can't find a sensor for a high flowrate to connect to your computer. Flow sensors usually have a 4-20mA analog out (calibrated to flow range) and/or a gigital out (one impulse for a defined volume increment). What are you using? $\endgroup$
    – mart
    Commented Jun 8, 2018 at 10:33
  • $\begingroup$ I'm using Honeywell ZephyrTM Digital Airflow Sensor and their limit is 300 SLPM $\endgroup$ Commented Jun 8, 2018 at 11:10

1 Answer 1


To measure an airflow you can measure the pressure drop across a section or before and after a bend.

That pressure difference can then be calculated into the flow rate.


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