Fellow Listers,

I’m wondering if anyone could provide some experience, guidance and incite into the following situation.  I have personnel working in ultra-cold freezers selecting/packing materials into boxes filled with dry ice.  A controller was installed to monitor temperature and CO2 levels with sensors installed.  I am concerned with the CO2 sensor specification in this environment, specifically concerning precision, accuracy and ability to calibrate to respond within an ultracold freezer.  Does anyone have any experience with similar CO2 sensors in this environment? 

Please respond off-line and thank you!

Bruce