The Yokogawa RAGL 41 Rotameter is designed for measurement of liquids and gases. The conical glass metering tube has a free rotating float. This float is mounted in a vertical pipeline with flow direction upwards. The flow is indicated by the top of the float and can be read from the standard scale on the metering tube or from a connected scale. Measurable flow rates for water (68°F/20°C) range from 0.002 l/h to 110 l/h, and for air (68°F/20°C, 1 bar abs) from 0.1 l/h to 3,500 l/h.

Measuring ranges vary by tube type: K metering tube offers 10:1, M metering tube offers 20:1 (10:1), and L metering tube offers 20:1. Maximum temperature depends on fitting material: SS fittings are rated for 212°F (100°C), PP fittings for 176°F (80°C), and with option /MV up to 266°F (130°C) (not for PP). Maximum pressure is 16 bar.

Features include a large selection of measuring ranges, anti-static metering tubes, high accuracy of free rotating float even at low flow rates, low pressure loss, visual check of the medium, non-powered local indication, large selection of scales, and an optional built-in valve.