Biogas flowmeter introduced for variable compositions
The flowmeter is ideally suited to measure biogas with a high carbon dioxide (CO2) content as well as small amounts of other media like hydrogen sulphide, nitrogen, hydrocarbonsor condensation water, and has been specially designed to measure dry and wet biogas with variable composition.
The flowmeter overcomes the limitations of the ultrasonic principle in biogas applications owing to high damping of the acoustic signals by CO2 and high-water content in the biogas. Its signal transducers provide a stronger ultrasonic signal into the gas, and specialised signal processing enables better detection of small, strongly dampened acoustic signals. These features, along with the mechanical design of transducers and transducer pockets, make the measurement insensitive to liquid and biological scaling.
It features a maintenance-free full bore flowsensor without any moving parts. Owing to the hydrogen sulphide in biogas being corrosive when dissolved in water, the measuring tube is made of stainless steel 1.4404/316 ℓ and the transducers are made of Nace-approved grade 29 titanium for maximum corrosion resistance. Equipped with lap joint flanges to lower its overall weight, the measurement accuracy is specified at 1% of actual measured flow rate when calibrated with air. When 2% accuracy is sufficient, users can select a dry calibration alternative at a significantly lower price.
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