LPU-2428 loop powered ultrasonic level sensors are now CSA certified for use in Class I, Div. 1, Groups C and D, and Class I, Zone 0, Group IIB hazardous locations. Class I, Div. 1, Group C, and Class I, Zone 0, Group IIB atmospheres contain ethyl-ether vapours, ethylene, or cyclopro-pane. Class I, Div. 1, Group D atmospheres contain gasoline, hexane, naptha, benzene, butane, propane, alcohol, acetone, benzol, lacquer solvent vapours or natural gas. LPU-2428 sensors feature microprocessor control to internally perform volume, flow, and totalization calculations. They provide a one- to 25-foot (0.3 to 7.62 m) detection range on liquids and a one- to 10-foot (0.3 to 3.0 m) detection range on solids.