Ross recently released explosion-proof high speed dispersers with NEMA 7&9 Operator Panel and special grounding provisions. Suitable for use in hazardous environments where flammable vapors, liquids, solids and/or dusts are present, these mixers reportedly include grounding systems designed to ensure that the vessel is properly grounded before the agitator is allowed to operate. The control panel features Start, Stop and Emergency Stop pushbuttons, a speed potentiometer, digital readout for agitator speed, and a 16-ft. grounding clamp device. Explosion-proof limit switches for locking out the motor if the blade is in a raised position or a mix vessel is not in place reportedly are also supplied on the mixer.
The classic saw-tooth blade of the disperser reportedly turns at tip speeds up to around 5,000 ft/min and creates vigorous flow in low to medium viscosity formulations under 50,000 centipoise. It generates a vortex on the liquid surface into which dry ingredients are added for quick wet-out. The dispersers are available in sizes from 1 to 500 HP for making batches from 1 to over 5,000 gal. Floor-mounted, tank-mounted, and vacuum-capable models are also offered.