Series 40TL tank-level sensors (photo) are specifically designed for level measurement in storage tanks. This Series resists the effects of foaming, ice and scum blankets because the sensors can be mounted at the bottom of the tank. The sensor calculates tank levels based on a pressure reading. It uses a solid-state pressure transmitter that is completely isolated from the process fluid by an elastomer sleeve that transmits the pressure through a fluid fill. — Red Valve Co., Carnegie, Pa.