2243 Analog Electronic

Electricity is used as the power source. The key difference between analog and conventional electric control is modulation. Analog controls have variable inputs and outputs, not just two states. Minor changes in output positioning of controlled devices make tighter control possible than with two-state (on-off) electric controls.

The hardware for analog electronic controls may include resistors, rheostats, Wheatstone bridges, operational amplifiers, or may use solid state components to measure the process and modulate the output devices.

Some considerations of analog electronic controls: • Unless a control dead band is built into the controller, it is likely that the controlled device will be activated by even the most minute deviation from set point. The action may be nearly imperceptible, but if this occurs the repeated hovering about the ideal set point may over work the actuators and cause reduced device lifespan.

• Analog electronic technology "connectibility" options are generally limited to remote adjustments, remote alarm panels, etc. This, and modest cost, make them a popular choice for basic HVAC manufactured systems that come with factory-installed controls.

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