... 4. Excellent durablity Detailed Product DescriptionLLQZ intelligent gas Roots flowmeterIntroduction: LLQZ intelligent gas Roots flowmeter is a highly accurate metrological instrument to continuously ... , and community gas usersApplication: industrial inert gases such as natural gas, LPG, air, coal gas, propane, butane, nitrogen, except oxygen, LLQZ intelligent gas Roots flowmeter