A General Description of a System of Parts for the Constant Vacuum Source

The constant vacuum source is a system that maintains a vacuum within a tank. The vacuum is created by a motor and pump (vacuum pump) that is connected to the tank. The vacuum pump is actuated by a microcontroller and relay that uses a pressure sensor to sense the amount of vacuum in the tank. When the tank looses vacuum of 15 inches of Hg (Mercury) or more, then the motor will turn on and will climb to 25 or so inches of Hg. The value of the low andn high thresholds for inches of Hg that is desired inthe tank and the amount of vacuum in the tank is shown on an LCD. Two potentiometers are used to adjust the low and high vacuum thresholds.