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Stationary engineers are primarily concerned with the safe, efficient, economical operation of utilities equipment. To do their job, they must monitor meters, gauges, and other instruments attached to the equipment. They take regular readings of the instruments and keep a log of information about the operation of the equipment. This might include the amount of power produced; the amount of fuel consumed; the composition of gases given off in burning fuel; the temperature, pressure, and water levels inside equipment; and temperature and humidity of air that has been processed through air-conditioning equipment. When instrument readings show that the equipment is not operating in the proper ranges, they may control the operation of the equipment with levers, throttles, switches, and valves. They may override automatic controls on the equipment, switch to backup systems, or shut the equipment down.