... 3.easy maintenance and installation 4.used for factory,oil field,chemical,metallurgy Summary: LWGY basic type worm flow sensor (called sensor hereinafter) ... cumulative volume,control the liquid quantitatively.The sensors are featured with high accuracy, long life, easy operation and maintenance, and ... contain of LZB/LZJ(-F)glass tube flow meter,LZB-W(B)micro type glass tube flow meters,G.R.F10/20/30 ...