The Electro-Osmotic Pump (EO pump), which employs electroendosmosis, generates no pulsation. It is ideal for pulsation-sensitive microfluidic systems, but only de-ionised water, methanol, or ethanol can be directly pumped. To overcome this limitation, this pumping unit utilises an internal diaphragm that isolates the ethanol etc. from the liquid to be delivered. This indirect pumping mechanism enables you to pump various liquids.