... YZ1515x,YZ2515x,DG-1 and DG-2 four kinds of pump heads, with flow rate from 0.05-1140mL/min. ... 4-20mA external control interface or RS485 communication interface as well. Typical application1.Quantitative add material during the chemical reflections2.Add ... liquid measurement in lab3.Transfer liquid pump in odious working environment Functions and features1.applicable pump heads: YZ1515x,YZ2515x,DG-1 ...