Pressure switch is a control switch, which is used in commercial and residential refrigerator system. It consists of three elements: pressure sensing element such as diaphragm, metal elbows and piston, a calibrating spring opposing the deflection of the pressure sensing element, thus translating pressure into motion and an electrical contacts that are actuated when spring deflection reaches a certain point. Pressure switches are often used as safety devices to cut the equipment off if the pressure is dangerously high or low.

Pressure Switch is a device that senses pressure and changes state at the programmed or adjust point. This closes or opens a set of electrical contacts when a given amount of pressure is exerted on the switch diaphragm. This can be adjustable or non-adjustable and dual pressure is available. The pressure switch closes at a pressure level called the cut-in pressure and opens at a pressure known as the cut out pressure. The cut out pressure determines the lower temperature limit. To set the uppermost temperature limit, the cut-in pressure must also be determined. The difference between the cut-in and cut-out pressure of the switch is differential. This is used as refrigeration system's operating control as a safety device, or to operate a certain part of the total system. Some pressure switches are equipped with a manual reset button that locks in the open position. This is used in both commercial and residential switches.

Pressure Switches are actuated by a change in the pressure of a liquid or gas. They activate electromechanical or solid-state switches upon reaching a specific pressure level. Pressure switches have an electro-mechanical or solid-state switch construction. Pressure switches are a sensor element or chip, a sensor or transducer, an instrument or meter, a gauge or indicator, a recorder or totalizer and a controller.

Pressure testing is a test performed on a two-stroke engine to ensure that the engine has no air leaks. An air leak in a two-stroke engine can cause a lean condition in engines air-fuel mixture. This in turn can result in serious engine damage.

Pressure Transducers are used in equipment such as plasticators to improve output and melt quality & enhance production safety. Pressure transducers operate on the principle of measuring the pressure-induced distortion in a flexible membrane. The transducer consists of two chambers separated by a thin flexible membrane.