The FC4.TL flow cell is made of PEEK. It has teflon endings permitting a fully compatible connection to chromatography tubing. The flow cell enables the use of sensors in a flow through arrangement. The flow arrangement is Thin layer cell “TL” for AC1, AC2, CC1, CC2 and CC3 sensors. The sensor is inserted into the slit of cell and tightened by closing of the door. The cell ensures the wall-jet flow around the working electrode and it is optimised so that no air bubbles cumulate in the cell. The cell contains also the contact and output cable.