... ).A grade, ISO9001:2008 3).inflammable gas: natural gas, LPG,coal gas, etc Scope of applications: Apply to ... flow measurement of inflammable gas, such as natural gas, LPG, coal gas and etc. Wireless meter reading. ... 6.High relability, at usual time gas meter set keeps powered off,and only when reading meter, can ... it be powered on and start work. After reading meter, ...