OPUS20E dataloggers can be connected to up to four external temperature and relative-humidity sensors, as well as two additional analog sensors. Intelligent BUS sensors can be integrated and a LAN network connection is available. Air flow and differential pressure sensors are typically connected to the OPUS20E via analog inputs as opposed to the maximum of four external temperature or humidity sensors that can be integrated via a digital BUS protocol. In connection with its LAN capabilities, the Opus20E is able to realize universal measurement networks in real time. —Lufft