Dear Rajesh,
Thank you for sharing an interesting application with us. Without commenting any detailed carbon dioxide levels in the potato storage itself, I would like to recommend you the Vaisala GMP252 Probe for monitoring these chambers. Please read more about this product from here: www.vaisala.com/gmp252. This potato related article might be also interesting as well: https://www.vaisala.com/sites/default/files/documents/CEN-G-HVAC-Potato-Chip-Success-Story-B211570EN.pdf

Best regards
Juhani