The Yokogawa RAMC Short Stroke Rotameter has a float that is guided concentrically to a special shaped conic metal tube. The position of this float is magnetically transmitted to the indicator. The short-tube Rotameter is used for measurement of flow rates of liquids and gases. Its special application is in troubled, opaque or aggressive mediums. The instrument is mounted in a vertical pipeline with flow direction upwards. The indicators are exchangeable without influence on the accuracy .

At first glance the instrument looks impressive with its all stainless steel design. A closer look reveals a unique patented "float blockage" detection systems. Operational safety is of the utmost importance in any flowmeter, and the RAMC is no exception – wetted parts are available in a variety of materials, and intrinsically safe outputs are available as an option .

The RAMC combines all the advantages of the variable area principle with robust design, reliable measurement, with or without auxiliary energy, culminating in a truly universal flowmeter for gases, liquids and steam applications. Maximum flow ranges are 0.025 to 130 m³/h for water and 0.75 to 1400 m³/h for air. Temperature range is -4 to 212°F (-20 to 100°C). Float damping prevents float bouncing in gas applications, and local indication is available without additional power supply .