Georg Fischer 5936.311 4" 3-2551-P1-12 5"-8" Signet Magmeter Flow Sensor without Display 4-20mA Output, Polypropylene and 316L SS.The Signet 2551 Magmeter is an insertion style magnetic flow sensor that features no moving parts. The patented sensor design is available in corrosion resistant materials to provide long-term reliability with minimal maintenance costs. These versatile, simple to install sensors deliver accurate flow measurement over a wide dynamic range in pipe sizes ranging from DN15 to DN900 (1/2 to 36"), satisfying the requirements of many diverse applications.