The world’s smallest dual bent-tube Coriolis mass flowmeter?

17 August 2012

Yokogawa Electric Corporation has introduced the ROTAMASS LR, which it believes is the world’s smallest dual bent-tube Coriolis mass flowmeter.

The majority of small Coriolis flowmeters on the market use single-tube detectors, which have been shown to be less accurate and stable under conditions that include vibration and changes in the ambient or fluid temperature. To meet the need for accurate and stable measurement of fluids at low flow rates, Yokogawa developed this low flow Coriolis flowmeter, based on its proven dual bent-tube detector design.

Designed to measure both liquids and gases, the effective turndown of the ROTAMASS LR is said to be no less than 2000:1 for liquids and 5000:1 for gases, and the mass flow measurement range spans from 10.5g/hr up to 40kg/hr, achieving a measurement accuracy of ±0.15% of reading for liquids and ±0.5% for gases.

The dual bent tube that optimally decouples the core measuring element from process vibration that can cause fluctuating zero stability and reduced measurement accuracy. When fluid density changes, a single-tube Coriolis flowmeter can become imbalanced and start to behave like an emitter. The ROTAMASS LR remains balanced because of the equal mass change in both tubes and the absence of interference from the process piping. By design, it is insensitive to fluctuations in the ambient temperature and achieves excellent zero stability under changing process conditions. The two tubes are made from C-22 alloy, which is less susceptible to thermal expansion than conventional stainless steel.

The measurement of tube temperature plays a key role in mass flow and density measurements. Normally it is more difficult to measure temperature with Coriolis flowmeters that have tubes with a smaller surface area. The ROTAMASS LR solves this problem by using an inline temperature sensor, ensuring exact and fast measurements in process temperatures ranging from -50 to +150°C.

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