The objective of the Phase II SBIR project is to develop a prototype sensor system to detect gaseous analytes in support of the spacecraft environmental monitoring and control system. InnoSense LLC (ISL) has utilized its Chemical Fingerprint§ sensor array fabrication technology in Phase I to establish the feasibility of a miniature device with multi-analyte detection capability. In particular, we have detected oxygen, carbon dioxide and humidity as potential target analytes. The oxygen sensor performed over 3-45% concentrations under a variable pressure of 8-14.7 psia. The Phase I working model could generated discernible signal with 0.1% O2 concentration. Upon fine-tuning the indicators in Phase II, the system performance will be tested with a prototype hardware that will also be developed in Phase II. ISL has received technology endorsement letter from a prime contractor in the NASA application area. ISL has also secured Phase III follow-on funding commitment from a commercialization partner. For assuring success of this project, ISL has assembled a technical team with a cumulative 100 person-years of experience in developing commercially viable sensor systems.