34 Environmental Analysis
Flow Sensors Offer Very High Resolution and Accuracy over a Complete Measuring Range
Sensortechnics (Germany) develops highly sensitive thermal mass flow sensors for air and gases with measuring ranges up to 500 l/min. Sensortechnics offers custom solutions with two sensing elements featuring excellent resolution and accuracy over the complete measuring range. One sensor chip is located in the middle of the main stream for the measurement of very small flows around the zero flow point. A second chip is arranged in a bypass configuration and measures higher flows up to full scale. The flow sensors utilise a microcontroller for digital signal processing and can continuously switch between the two sensing elements. Sensortechnics’ mass flow sensors achieve very fast response times below 10 ms and offer a linear analog output signal and a digital I²C or SPI bus interface at the same time.
An important performance characteristic of high quality medical ventilators is the early detection of the patient’s inhaling phase. This ensures that spontaneous breathing can immediately be supported with a defined overpressure and the patient’s work of breathing is kept as low as possible. Additionally, a high resolution and accuracy over the complete flow range is essential for many applications. Both requirements can be perfectly met using Sensortechnics’ flow sensors with two sensing elements. Sensortechnics’ offers fast and flexible adaptions of its flow sensors according to custom specific requirements. This allows OEM device manufacturers to shorten their design cycle, save development costs and achieve competitive advantages as well as fast innovations to the market.
Important features of Sensortechnics’ flow sensors include; flow ranges up to 500 l/min air or gas, very high resolution due to two sensing elements, a microcontroller based digital signal processing and an analogue output signal and digital I²C or SPI bus interface.
Reader Reply Card No. 92
Outstanding Innovative Spirit, Customer Orientation and Social Commitment Constitute the Key for Success
The development and production of miniature pumps for high-end applications in environmental and analysis technology has made Schwarzer (Germany) the company winner of the „Großer Preis des Mittelstands“ in Düsseldorf. The distinguished award granted by the
Oskar-Patzelt Stiftung foundation is Germany’s chief economic award to small to medium-sized businesses. After the final participation in 2010 Schwarzer Precision now finally belongs to the business elite in Germany. Dr. Christoph Hartmann, Minister for Economy and Science of the German state of Saarland and patron of the award gala emphasized the importance of the award during his commemorative speech: “The price winners belong to the elite of Germany’s small and medium-sized businesses; they shape the image of their regions.” The business owners assume economic and social responsibility, contribute to the community and their influence is pronounced. An economically attractive and socially vital region in Germany needs a strong small to medium-sized business sector to achieve permanent success." The beginnings with aquarium pumps in 1970 have evolved today into high-precision miniature pumps for high-end applications. Worldwide areas of application include, apart from Formula 1 racing and aerospace, environmental and technology. These are sensitive areas where precision, durability and supply reliability are absolutely vital. While the pumps became smaller and smaller and technically increasingly sophisticated over the past years, Schwarzer was able to chart a healthy growth, also because of its own research and development department. Among others, this division deals with flow dynamics and micromechanics thus securing the competitive edge. This is complemented by a modular system based on many years of development experience. This approach allows the components to be precisely adapted to customer requirements, an aspect that is appreciated all over the world.
Reader Reply Card No. 93 Reader Reply Card No. 94
IET November / December 2011
www.envirotech-online.com
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