Yokogawa Electric Corporation announces the release of the RotaMASS LR, the world’s smallest dual bent tube Coriolis mass flow meter. The new RotaMASS LR employs a proven dual bent tube design and represents a significant advance to Yokogawa’s RotaMASS Low Flow Line product family for gas and liquid flow measurement.
Designed to be self-draining and to measure both liquids and gasses, the mass flow measurement spans from 0-40 kg/h. The accuracy is +/- 0.15% for liquids and +/- 0.5% for gasses. The RotaMASS LR meets the market’s demand for accurate and stable measurement of fluids at low flow rates. Yokogawa has developed the low flow Coriolis meter based on its proven dual bent tube design to overcome the current shortcomings of single tube low flow meters. These shortcomings include susceptibility to external vibrations and changes in ambient or process fluid temperatures, which lead to less accurate and stable measurements in real-world conditions.
Dual bent tube design with perfect balance for robust performance
The ROTAMASS LR employs a dual bent tube design that optimally decouples the core measuring element from process vibration that can cause fluctuating zero stability and decrease measurement accuracy. When fluid density changes, a single tube Coriolis flow meter can become imbalanced and start to behave like an emitter. The ROTAMASS LR remains balanced due to 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.
Unique inline temperature sensor for reliable measurement
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 flow meters 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°C to +150°C, a unique feature in the low flow Coriolis flow meter market.
Robust stainless steel housing
The ROTAMASS LR sets a new safety standard in the low flow market, with a gas-tight, all-stainless-steel secondary containment that can handle pressures up to 65 bar. The ROTAMASS LR can be used in high-pressure applications up to 400 bar. A huge variety of welded process connections are available. Unlike most flow meters on the market today, gaskets are not used, minimizing the risk of leaks.
Insulation and heating jacket options
For the prevention of fluid component separation and gas condensation, insulation and a heat jacket are available as an option.
Yokogawa Corporation of America