Auro controls offers reed switch based liquid level and liquid flow sensors from crydom magnetics limited, uk, one of the leading manufacturers of these sensors. Pps has a high working temperature and pps based devices for liquids up to 120c continuous and are also suitable for potable water/food grade applications and to a wide range of organic and inorganic chemicals such as acids, fuels/oils, alcohol bleaches and detergents and have another benefit of being resistant to electrolytic effects due to it being non-metallic. In hard water areas where lime scale build up is a problem, some crydom-make sensors employ "out-of-the-water" pivot designs for the float effectively eliminating malfunctions. Switching action of these sensors is via hermetically sealed reed switches, cushioned against mechanical shocks in compliant rtv silicone compound. Devices for internal or external tank mounting in vertical or horizontal orientation are standard and devices carry ul and wbs approvals.
