Â­TÂ­here are many different ways to create a motion sensor. For example: 1  It is common for stores to have a beam of light crossing the room near the door, and a photosensor on the other side of the Â­room. 2  When a customer breaks the beam, the photosensor detects the change in the amount of light and rings a bell.
Definition of weir. 1  1 : a fence or enclosure set in a waterway for taking fish. 2  2 : a dam in a stream or river to raise the water level or divert its flow.
A conventional septic system is composed of the septic tank and the drain field. The drain field is where the last stage of wastewater treatment system takes place. It is the area of effluent purification and distribution. An essential part of the drain field is the distribution box.If you think about it, its name gives it away. It is a structure that connects the effluent pipeline from your septic tank to the lateral line, seepage pit, or galley networks. The distribution box or d-box regulates the dispersion of the treated effluent.t is the area of effluent purification and distribution. An essential part of the drain field is the distribution box. If you think about it, its name gives it away. It is a structure that connects the effluent pipeline from your septic tank to the lateral line, seepage pit, or galley networks.