intrinsically safe for use in hazardous environments, this FLOWLINE Switch-Tek ultrasonic level switch is ideal for high or low liquid level detection of chemicals, low viscosity petroleum-based liquids, or solvents with a 1A relay output. Model can be mounted through the tank wall or inside the tank, and connected to a PLC or relay controller. Switch can be used with a number of liquids including acetone, diesel fuel, and hydrochloric acid. Ultrasonic Level Switch, Universal, Poly