feed water flow meter,water meter for all gas,steam,fluid each made according to u ... Li batter; external power supply of 24VDC; 220VAC (only for separate type)Output formsSite display reading; 4~20mA (2- ... shall execute GB/T9115.1~9115.4~2000 series standard. For pipeline type, small diameter flowmeter of DN6, DN8, ... . When media flow up-down or down-up, for ordering, please note: right view, left view