FLXA21 is the new generation of two-wire liquid transmitters with a new modular design for continuous on-line measurements in industrial installations. It provides the flexibility for either single or redundant measurement. The FLXA21 modular design offers the flexibly to assemble a variety of systems for applications measuring pH/ORP, Contacting Conductivity (SC), Inductive Conductivity (ISC) or Dissolved Oxygen (DO).