Thomas Products Ltd. manufactures level switches, including multi-level indicator, side mounted, single level, or bottom mounted models. It can manufacture simple liquid level float switches as well as continuous output level sensors and everything in between.
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The L-40 level switch is ideal for level control in RO tanks. It is compact and rugged, and can be mounted vertically or horizontally. A combination these level switches can be used to function as a high-level or low-level switch. In addition, they are often installed as emergency overflow switches (shown in the photo in red). When used with a latching controller, the L-40 can be used in a pump up/down system.