Increasingly stringent safety and environmental regulations mean leaks in the machine spaces of ships are no longer permitted; even small leaks like those previously tolerated for functional purposes are now prohibited.

Every mechanical seal in a pump requires a film of lubrication between its gliding surfaces, small leaks of a few milliliters per hour are necessary. Without this lubricating film, the mechanical seal would quickly fail.

The Allseal system utilizes a non-wearing opto-electronic sensor located in the wall of the coupling bracket to capture this leak. As soon as the liquid level reaches the sensor's prism tip, it sends a signal and can also detect whether the mechanical seal is beginning to suffer damage.