Whenever high turndown or low pressure losses are important in gas metering applications in any industry, thermal mass flowmeters offer a real alternative to traditional measuring techniques whether for process control, consumption and supply monitoring, detecting leaks or monitoring distribution networks. Using insertion versions, it is also possible to measure gas flows in very large pipelines or in rectangular ducts. The thermal measuring principle is widespread in industry and is being used successfully in many applications with gas flow, for example: compressed air, carbon dioxide, argon, nitrogen and oxygen, natural gas, air and biogas measurement.