... applicable for liquid level measurement for water, liquid ammonia, light oil, liquid gas, etc.Structure principleULB-S series double color glass ... and the interface of the liquid and gas is very clear.Main technical parameterMeasuring range (the distance between the flanges’ ... : ZG3/8″(external thread);Connecting flange: HG5016-58, DN20 raised face flange HG5010-58, DN20 plain flange JB/T82.1-94, ...