Remote control of current and voltage is a plus if the welding operator is located away from the power source.Robotic and automatic applications generally require high-duty-cycle power supplies, and controls and connections for interfacing to the robot or automatic feature.Supervisory control of the process will prevent the welder from changing the welding procedures. Here, select a power supply or controller that enables the supervisor to program the procedures, then lock them into the control memory, Some power supplies or controllers offer the welder limited control of the process.Input power to power supplies can bc single and/or three phase, with voltage from 115 to 575 V and input frequencies of 50, 60, or 50/60 Hz. Note that many inverter power supplies are designed to operate on both single- and three-phase input, and have automatic input-voltage selection and linking.

The first light-rescue trucks had gross vehicle weight ratings from 8,000 to 10,000 pounds and payloads of 2,000 to 4,000 pounds. At that time body manufacturers were building mostly from steel. When the body was fabricated and only a small amount of equipment added, the unit was overloaded.Today the light-duty rescue can be built on a two- or four-door cab chassis with GVWR up to 19,000 pounds for two-wheel drive, and 17,500 pounds for four-wheel drive. This range allows for more options and greater flexibility.

Circle 108 on inquiry card This duct liner offers a high level acoustic and thermal resistance. It meets thermal performance requirements of many of the most stringent local and state energy codes, including Title 24 of the California Building Standards Code. An encapsulant edge coating covers fibers and prevents flaring of the insulation at the edges (an important IAQ concern with internal duct linings). The airstream surface is treated with an anti-microbial agent to prevent the growth of fungi and bacteria. Knauf. Circle 109 on inquiry card The Wind Guard air curtain is a fixed-speed, belt-driven unit that produces large volumes of air at low operating sound pressure levels. Primary applications are over doors 14-ft. to 26-ft. in height. It can successfully repel gusts of wind up to 30 mph. Heated and unheated models are available, with heated models available in gas, electric, steam and hot water coil designs. Mars Air Doors.

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