A modular sample conditioning system formed for in-situ sampling installation, referenced herein as “source mounted”. The present invention relates to a docking platform or substrate configured to receive multiple, diverse sampling components in various flow configurations, coupled with a unique housing/enclosure formed to engage the docking platform so as to further strengthen and stabilize the mount, the enclosure also formed to engage one or more of the mounted sampling components, so as to provide access outside of the enclosure for visibility and/or manual access of same, providing an easily installed and maintained, user-accessible, on-site modular sampling conditioning/monitoring system.