Automatic controls like thermostats or automated building systems reduce ____ with the equipment. Pneumatic controls use ____ to transmit signals between the sensor and the controlled device. Sometimes air in pneumatic systems is dried with ____. Pneumatic controls often include a ____ assembly to move air back and forth. ____ positioners use a small volume of air to control a larger volume of air. ____ or gain determines how much to modulate fluid flow. It's measured by comparing pressure and temperature when a system is closed with when it's open. Direct Digital Controls (DDCs) operate at low voltages, interact with a database of internal information and ____ control valves, dampers, motors, etc.

Automatic Controls (ch. 16)

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