Sierra Instruments 221-LS-E4-ST-PF Vortex Flow Meter

The Sierra Instruments Innova-Flo 221-LS-E4-ST-PF Vortex Flow Meter is an insertion-type water flow meter that uses vortex shedding to measure flow in liquids with a compact probe-and-enclosure configuration. It features the LS standard probe length and the E4 remote NEMA 4X enclosure for electronics, plus a PF packing gland/2-inch, 150 lb flange process connection, enabling secure installation in typical piping. The instrument is loop-powered from 12 to 36 VDC and provides two outputs: a 4–20 mA analog signal for continuous flow monitoring and a pulse output proportional to volumetric flow, suitable for integration with common control systems. The ST temperature rating covers -40°F to 400°F (-40°C to 205°C), making it compatible with a broad range of water and light liquid applications, while the Innova-Flo vortex sensing technology uses a piezoelectric element to detect vortex frequency and mitigate pipeline vibration. Insertion configuration offers access to flow in pipes where inline meters are impractical, delivering Sierra’s reputation for reliable, repeatable flow readings for water metering and process control tasks, including dosing, batching, and energy accounting.