We propose you our precession Vortex Flow Meter again, it has been widely used for various kinds of gases in petrol, chemical, electricity,metallurgy, city gas supply etc, which is the prefered products in the oil field and city natual gas supply distribution measurement and trade measurement. It is good to measure natural gas, biogas, LPG vapor etc. Now we made the largest size DN200.
The flow converter could output frequency pulse, 4~20mA analogue signal, and has RS485 interference, it could connect computer network, the transmission distance can reach 1.2km. Multi physical quantity parameters alarm output, the end user can select any of them. And flow meter converter could rotate 360degree, easy and convenient installation. Please refer to the below picture of DN 150 prcession vortex flow meter.