Ultrasonic stack gas flowmeter
July 2003
Flow Measurement & Control
According to recent European legislation, pollutant emissions of industrial plants must be monitored, and for mass determination of the pollutants, the exhaust gas flow must be measured.
Durag's D-FL 200 volume flowmeter, from OEN Enterprises, is an ultrasonic measuring system operating on the differential transit time principle. In-situ measurement is directly in the flue gas flow. The instrument provides continuous measurement of the flow velocity and the flow rate of the exhaust gas. The measurement system is designed for flow monitoring below the dew point and for aggressive gases. The sensors are completely de-coupled from the gas by means of purge air.
The transducers continuously transmit and receive impulses, while the gas flow alters the transit time. The time upstream is reduced and the time downstream is prolonged. The system meets IP65 protection requirements, and the length of the measuring range is up to 8 m with a maximum operational temperature of 200°C.
High pre-scaleable limit values are indicated immediately, permitting necessary interventions in the plant's control system in order to comply with prescribed emission values.
For more information contact Noel Bauchop, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za
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