Greensystems LLC specializes in the development, supply and maintenance of metering systems for gas metering units, environmental monitoring and process automation. Development of solutions for natural gas metering is a priority activity of the company. Company’s staff has more than 15 years of experience in the Russian gas market in leading European companies producing ultrasonic gas flow meters. Using world experience and advanced technologies of ultrasonic gas flowmeters production "Greensystems" developed their own line of ultrasonic gas flowmeters of UGS series. Modifications of the flowmeters of UGS series cover all the measurement tasks for custody transfer and operational metering in the gas industry - from production to sales of gas to end users. The concept of UGS series flowmeters development based on principles: the best available technologies and basic solutions proven by many years of operation in the gas industry; independence from components supply and use of software from EU and USA; full compliance with state standards and standards of Russian fuel and energy complex enterprises.