EBME Forums Forums Maintenance Technical Assistance Mainstream ETCO2 Sensor CM2200 / Capnostat 5

Hello!

I am programming a monitoring device for an e-health research project. It does CO2 measurements.

As mentioned in the title, two CO2 sensors are used: CM2200 and Capnostat 5. Both sensors have to be using the same protocol since my code works for both identically. Specification with protocol description is attached and available here in Google drive: https://drive.google.com/file/d/1EMyQ6AMnBkjyrwkzUrEWe8IEAgXwJf43/view?usp=share_link).

I have a problem with ETCO2 and respiratory rate (RR) readings. After a successful zeroing procedure, ETCO2 and RR values are always zeros when I continuously breathe into the sensor.

Could that be related to the sensor not being connected to the breathing mask and system at both ends? Only this airway adapter is inserted into the sensor:



Does anyone know what could cause such behavior?
Any help or tips are very appreciated! : )