The new L&W-sensor measures the amount of water at any desired position in the forming section. The measurement results make it possible to gain control of drainage and ply bonding.With the new sensor it is possible to optimize the wet end chemistry of the stock, which will enable better runnability and increase paper quality.Normal use is in single point measurements between step foils or vacuum boxes. It is common to measure before or after the couch roll, to be able to estimate moisture content in the paper, before it leaves the wire. In multi-layer Fourdrinier machines all layers are easily monitored, providing a better overall picture to improve multiple ply bonding. The instrument provides for control of foils adjustments, vacuum, refining and the use of retention chemicals.The main advantages of controlling drainage is reduced energy consumption, reduced number of web breaks, reduced emissions, reduced usage of chemicals and reduced maintenance.“With this new sensor in combination with our other portable instruments, it is possible to monitor the drainage profile all the way from headbox to couch,” says Lars Kånge, Product Manager, Lorentzen & Wettre.