Building a reliable NDIR gas sensor isn’t as easy as picking an IR emitter and detector off the shelf.

One of the main advantages of NDIR is that it relies on optical measurement rather than a consumable chemical reaction. Electrochemical sensors depend on reactive materials that gradually degrade as they operate, which can shorten sensor lifespan and require more frequent replacement or calibration. NDIR sensors, by contrast, measure gas concentration using infrared ligh...

You can save 40% by buying before May 17th. Get the app for a special introductory price of 29 Euros per year. NDIRsim helps engineers and developers simulate realistic gas measurement conditions directly in the browser, with no installation or admin rights required. Supported by the HITRAN database, it enables accurate modeling of gas absorption while factoring in rea...

The critical checks are spectral overlap, filter alignment, modulation behavior, and the use of sensing/reference channels where needed. A simple rule: define the gas first, then match the emitter output and detector filter to that absorption band, and finally verify time-constant behavior and real-world operating conditions. Checklist: matching IR emitters and pyroele...