Introducing the Deltabar FMD71 level transmitter, which uses two pressure sensor modules, each connected electronically to a single transmitter. Using a Ceraphire ceramic sensor in the pressure sensor modules, the transmitter calculates the differential pressure from both sensors and transmits the level, volume or mass via 4-20 mA with HART as a standard two-wire loop-powered device. One sensor module measures the hydrostatic pressure (HP) and the other one the head pressure (LP). Each sensor sends a digital signal corresponding to temperature compensated measured pressure to the transmitter. This electronic system eliminates issues of traditional differential pressure measurements by doing away with impulse lines or capillaries and their related issues of icing, clogging, leaks, condensation and changing ambient temperatures. The Ceraphire ceramic cell is vacuum, corrosion and abrasion resistant, eliminating traditional mechanical issues with corrosive and abrasive media. The Ceraphire ceramic cell can be used in absolute vacuum and has excellent chemical resistance properties, similar to Alloy C.
Endress+Hauser, Inc.; www.us.endress.com