Monday 14 November 2011

Liquid & gas flowmeter

Yokogawa, "the home of the original Rotameter," has introduced the new Glass Rotameter RAGN, designed to offer an unlimited lifetime combined with safe and virtually maintenance-free operation. The RAGN resists highly corrosive media and is used for the continuous flow measurement of liquids and gases.

Yokogawa is the first supplier to completely provide safety excellence to all applications for glass and metal Rotameters based on FMEDA. The RAGN with reed switches has been assessed to SIL 1 acc. to the reworked IEC 61508:2010 and complies with the Machinery Directive ISO 13849-1 standard.

When the original Rotameter (or variable area flowmeter) was developed in 1909 by Karl Küppers, the importance of the variable area meter was quickly recognized. Due to the Rotameter mechanical principle, continuous flow measurement was possible for the first time. The simple principle, that a float rises inside a conically glass tube and its position on a scale can be read as the flow rate, has not changed. Rotameters have been continuously developed and optimized to meet the requirements of the modern process industry. They are still popular in all industries and customers value its reliability and trouble-free operation.

The RAGN comes in an all stainless steel design and offers the widest measuring ranges from 2
ml/h – 10 m³/h water and 0.1 l/h – 160 m³/h air. The measuring glass tube is equipped with an
easy-to-read-scale highlighted by a yellow background and protected by a splinter shield. The
modular design limit switches can be easily retrofitted and are used to indicate minimum or
maximum flow alarms, by outputting a signal when the magnetic float has reached or exceeded
the limit switch position. An optional cable connection box is available for simple wiring. The
Yokogawa RAGN lineup combines multiple process connections and sizes in a modern design.

In these days when environmental management has finally found its way into our minds and
corporations, the pure mechanical principle of the Rotameter regains even more momentum.
For manufacturers it is important to optimize productivity, consume less energy and reduce
energy costs. Rotameters generally have a very low pressure loss compared to many other flow
measuring principles, and therefore consume less energy. This helps achieve sustainability by
being a key aspect of environmental management. With common applications and normal
operating conditions, they are maintenance free and have an unlimited lifetime.

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