GF Piping Systems, Tustin, CA, offers the Signet 2537 paddlewheel flowmeter series for water and wastewater treatment, chemical processing, and pump protection. The blind sensors combine paddlewheel sensing technology with a variety of output options, including 4–20 mA, pulse divided, and Signet S3L data link. You can also choose from a selection of body and rotor pin materials, such as polypropylene and PVDF. Dynamic flow range is from 0.3–20 fps with 0.5% of reading repeatability and an input frequency range of 1–1000 Hz. Linearity is ±1% of reading.