Model ST51 is compact, low cost solution for flow measurement of biogases and natural gas. This insertion-style flow meter has no moving parts and installs easily into pipe via a compression fitting. The ST51 transmitter is a rugged, IP67 rated enclosure with dual conduit ports. The complete instrument carries global agency approvals for HazEx installations in Division l/Zone 1 applications. The instrument comes standard with dual 4-20 mA outputs and a 500 Hz pulse output. Optional are HART and NAMUR compliant 4-20 mA outputs, SIL compliance rating, extended temperature service, and more.