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2012 Press Releases-18

Tokyo, Japan - August 15, 2012

Yokogawa Releases ROTAMASS LR
- the world's smallest dual bent tube Coriolis mass flowmeter

Yokogawa Electric Corporation announces that it will release ROTAMASS LR, the world's smallest dual bent tube Coriolis mass flowmeter, on August 15.

The new ROTAMASS LR employs a proven dual bent tube and self-draining design and represents a significant addition to Yokogawa's ROTAMASS Low Flow Line product family for gas and liquid flow measurement.

Designed to measure both liquids and gases, the effective turndown of the ROTAMASS LR is no less than 2,000:1 for liquids and 5,000:1 for gases, and the mass flow measurement range spans from 10.5 g/h up to 40 kg/h, achieving a measurement accuracy of ±0.15% of reading for liquids and ±0.5% for gases.

Development Background

The Coriolis flowmeter market continues to grow, and a number of market research reports have identified increasing demand for smaller devices with a 2 inch bore diameter or less. There is also rising demand for low flow measurement solutions that achieve high accuracy and stability. The majority of small Coriolis flowmeters on the market currently 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 market's need for accurate and stable measurement of fluids at low flow rates, Yokogawa has developed this low flow Coriolis flowmeter based on its proven dual bent tube detector design.

Product Features

  1. Dual bent tube design with perfect balance for robust performance
    The ROTAMASS LR employs a dual bent tube 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 flowmeter 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.
  2. 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 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°C to +150°, a unique feature in the low flow Coriolis flowmeter market.
  3. 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 flowmeters on the market today, gaskets are not used, minimizing the risk of leaks.
  4. 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.

    Takashi Nishijima, a Director and Senior Vice President, and Head of the Industrial Automation Platform Business Headquarters, comments, "By measuring and controlling very low flow rates with a high level of precision, Yokogawa is helping its customers realize the VigilantPlant concept. We believe that this newly developed product gives customers a wider range of choices in multi variable process measurement and allows for greater accuracy and steady measurement in their utilization."

Major Target Markets

Chemical research laboratories, chemical plants, pharmaceutical plants


Liquid and gas low flow measurement, high pressure gas pipelines, chemical injection, micro dosing systems, metering pump control, blending, precision coating, vacuum thin film coating, etc.

For more information

About Yokogawa

Yokogawa's global network of 90 companies spans 55 countries. Founded in 1915, the US$4 billion company conducts cutting-edge research and innovation. Yokogawa is engaged in the industrial automation and control (IA), test and measurement, and other businesses segments. The IA segment plays a vital role in a wide range of industries including oil, chemicals, natural gas, power, iron and steel, pulp and paper, pharmaceuticals, and food. For more information about Yokogawa, please visit the website

About Yokogawa Europe B.V.

was founded in 1982 as the European headquarters in Amersfoort in the Netherlands. Yokogawa has its own distribution, service and engineering organizations in Europe. These have been extended to Central and Eastern Europe and South Africa in order to extend and improve market coverage and service for the processing industry and automation. Yokogawa develops and produces flowmeters at Rota Yokogawa in Germany and liquid analyzers and industrial safety systems in the Netherlands. In addition to the network of Yokogawa branches there are branches in particular regions and independent commercial agencies for test and measurement equipment(T&M) which handle the special requirements of this fast growing specialist market. Please visit the company's website

About Rota Yokogawa GmbH & Co. KG

is part of the worldwide Yokogawa Group but it is equally a traditional German technology center. The company was founded in 1909 and took its name from the Rotameter®, a very popular flowmeter that continues to be made in Wehr(Germany). Rota Yokogawa is the flow center of excellence for Yokogawa Europe and other Yokogawa affiliates. Please visit the company's website

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