... and little flow rate mediums. HH50 series metal tube float flowmeter has instant indication type and smart remote transmission type ... limit and lower-limit alarm output, accumulated pulse output, batch control, standard two-wire 4-20mA current output, ect. multiple types ... the different structures of measuring tubes, HH50 series metal tube float flowmeters can be devided into HH50, HH51, HH52 and ...