The ingress of water into fluid power or lubrication systems reduces the life of oil significantly and causes damage to other components used in the systems. The most reliable method of detecting water in oil is to measure the interface level between water and oil when the water is separated. The BÜHLER water alarm units have a float that rises in water but sinks in oil. It only takes a build-up of around one-liter water in the sight glass to elevate the float and actuate the first contact to signal danger. The secondary contact warns that there is water in the tank. Water alarm units for in-tank installation are available upon request.