A compact, ultrasonic liquid flowmeter/controller
The new, compact ES-Flow ultrasonic flowmeter/controller Series ES-113C (photo) was designed for the OEM market to measure or dose low-volume flows with high precision, high linearity and low pressure drop. Liquid flows from 2 up to 1,500 mL/min can be measured using ultrasound in a small-bore tube. This technology is independent of fluid density, temperature and viscosity, so the instrument does not require recalibration when switching fluids. Thanks to the combination of a straight sensor tube with zero dead volume and transducers positioned at the outer surface, the flowmeter is self-draining and easy to clean. Wetted parts are made of stainless steel, and the exterior design is rated to IP66/IP67. The on-board proportional-integral-derivative (PID) controller can be used to drive a control valve or pump. This makes it possible to establish a complete, compact control loop. Moreover, the instrument features various fieldbus options, customizable I/O functions and temperature as secondary output. — Bronkhorst High-Tech B.V., Ruurlo, the Netherlands