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Title: A New Sightly Bent Single Tube Coriolis Mass Flowmeter For Corrosive Fluids
Author: Martin Anklin, Alfred Wenger
Source: Flomeko 2003
Year Published: 2003
Abstract: Coriolis mass flowmeters (CMF) have proven to measure mass flow very accurately to better than 0.10% for water. The high accuracy and rangeability of CMF is one reason for its fast growth and acceptance in industry. The commercially available CMF show a broad variety of designs, such as single tube, dual tubes, bent tubes or straight tubes. Since CMF are available with different tube materials like stainless steel, Hastelloy and titanium, they can be used for all kinds of liquids or gases. However, there are only few designs, which can withstand highly corrosive fluids. Such sensors are made out of tantalum, zirconium or contain lined tubes. On one hand, tantalum shows a very good performance under acidic conditions, on the other hand is has the disadvantage of its high price, which leads to very expensive sensors. Zirconium is much cheaper and has nearly the same corrosive performance for many acidic and alkaline fluids like, hydrochloride acids, acetic acid, hydrogen peroxide, urea and others. The cheaper price of zirconium versus tantalum also allows to develop larger size sensors up to DN50 (2) with reasonable costs for the customer. Therefore, the design of the new CMF is made the way, that all wetted parts consist of zirconium R60702. The new single tube CMF is called Promass H and its design is schematically shown in figure 1.

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