Metal tube Rotameters are variable area flowmeters for measuring volumetric flow rates of liquids and Gases. The construction includes a tapered stainless-steel tube. A float with a magnet embedded in it, moves inside a tapered tube. The float is magnetically coupled with an indicating pointer assembly. The float position inside the tube is result of balancing of buoyancy and gravitational force. As flow tube is tapered from inside, gap is created between inside wall of tapered tube and the outer diameter of float and fluid flow passes through it. As the float moves vertically up and down inside the tube, the magnetic coupling moves the indicating pointer assembly which is indicates the flow rate. An analog electrical output of 4-20 mA which is proportional to fluid flow rate can be offered in Metal tube Rotameter. A Hall effect sensor senses the position of pair of magnets mounted on shaft assembly. As the analog pointer rotates the output of the Hall effect sensor varies. This output is processed by an electronic circuit to give current output proportional to flow rate. Electrical Transmitter version is available in various versions suitable for applications in safe and hazardous areas. Two wire Loop powered 24 DC supply Output: 4-20 mA HART communication output (Optional) CE / ATEX certifications IP 65 construction as standard