Infineon’s XENSIV™ PAS CO2 sensor module available from EBV
EBV now offers a PAS solution that will facilitate more widespread CO2 monitoring. As well as being suitable for integration into air conditioning units, this technology is also applicable for use in smart thermostats and standalone monitoring equipment.
Based on picking up sound resulting from the expansion of targeted gas molecules after they have been excited by flashes of infrared (IR) radiation, photo-acoustic spectroscopy (PAS) offers a very effective means via which to measure the CO2 content in air. This technique has key advantages over alternative gas sensing methods. Among these are:
- Requiring only a relatively small amount of energy,
- Fitting into a compact form factor,
- Being inexpensive, so not contributing too heavily to system component costs,
- Having more rapid responsiveness than most other methods,
- Offering greater accuracy than certain other methods,
- As minimal sensor drift is witnessed, periodic calibration can be avoided.
Infineon’s XENSIV™ PAS CO2 sensor module is highly compact (measuring 14mm x 13.8mm x 7.5mm). Being recognised as the smallest PAS sensor module currently on the market, it can fit into even the most space limited of application settings. This module attains ±3% accuracy when determining CO2 concentrations, benefiting from sophisticated compensation algorithms that mitigate effects which would otherwise impact on this. It has a CO2 measurement range that spans from 0ppm to 10,000ppm.
EBV’s XENSIV™ PAS CO2 sensor evaluation shield
To support customer implementation of this XENSIV™ module, EBV offers a comprehensive evaluation shield based on this technology. Alongside the CO2 sensor module, this board features Infineon pressure and temperature sensing devices. These help with compensation of fluctuations in ambient conditions, so as to enhance accuracy. A 12V power conversion circuit is included, as well as a broad array of different serial communication interfaces.
As well as being used in isolation, the EBV shield can be connected to Arduino for conducting evaluation work on the customer’s selected microcontroller/microprocessor platform - with access to a highly portable Infineon library meaning that this shield is compatible with a wide variety of different platforms. If they wish, customers can use the break-away board, enabling direct incorporation into other electronic systems. As an extension, WLAN and cellular IoT connectivity options can be chosen from.
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