Pyreos, the world’s only supplier of semiconductor-scale pyroelectric sensors and a well-established supplier of breath analysis detectors for medical use worldwide, announces first volume deliveries of its new PY3151 dual channel infrared detector for Carbon Dioxide (CO2).  This detector delivers a 4x increase in signal output which delivers a 2.5x higher system signal to noise (SNR) than the established range of Pyreos CO2 detectors such as the high volume PY2572 and PY2434.  It is now shipping in volume to Pyreos customers and into Intensive Care Units (ICUs) for critical care including for covid patients.  This new performance level will enable breath analysis systems to be faster, lower power, and more accurate.  The new product is also in widespread testing with Pyreos’ many other breath analysis customers.


PY3151 delivers 2.5x higher system SNR and builds on Pyreos breath analysis experience and recent optimisation success in Hydrocarbons

The PY3151 CO2/reference pyroelectric sensor in a TO39 package is developed from Pyreos’ well established range of analog TO39 detectors and builds on Pyreos’ experience supplying medical and consumer breath analysis applications worldwide, particularly for capnography and anaesthesia.

The improvement in performance is achieved by optimisation of the IR absorbance of Pyreos’ patented thin film pyroelectric material and builds on experience from the company’s higher-performance Methane range, leveraging the fundamentals of the company’s unique thin-film process.


Pyreos reported 5x growth in medical breath analysis due to high speed, excellent stability and ease of design.

Pyreos has shipped medical breath analysis devices in volume for several years and in 2021 the company announced 5x revenue growth in this market segment. The success of the product range is due to the products’ high speed, stability in challenging environments, ease of design and rapid start-up characteristics, supported by an affordable price point and production availability

Customers also value the very high Responsivity of the entire Pyreos detector range which reduces system space, cost and component count by enabling the removal of the external amplification stage required for competitor IR sensors.

“Our very fast integrated pyroelectric products have won designs away from competitors in medical and consumer breath analysis applications,” said Andrew Wallace, CEO at Pyreos.  “This major enhancement to the sensor employs the fundamental benefits of the thin film technology and is an example of many more potential improvements based on the unique processes we use.“


Datasheets and support resources for the new PY3151 pyroelectric detector are available.

The PY3151 uses a 4.26µm/180nm filter for CO2 and a 3.7µm/110nm filter for reference in a Pyreos standard dual channel analog TO39 package for gas.   It is one of Pyreos’ high sensitivity sensors (see datasheet) optimised for gases such as Carbon Dioxide and hydrocarbons. Samples, evaluation kits and technical data are available from and shortly on

Products used for capnography include the PY2343, PY0234, PY2572, PY3151, ePY12231, ePY12211. This web page provides more information on Pyreos capnography implementations and products, and this company blog demonstrates how affordable capnography kits can support low-income economies.