pressure switch

s with switches that activate on low pressure A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids. Another type of pressure switch detects mechanical force; for example, a pressure-sensitive mat is used to automatically open doors on commercial buildings. Such sensors are also used in security alarm applications such as pressure sensitive floors.

s with switches that activate on low pressure A pressure switch is a form of switch that operates an electrical contact when a certain set fluid pressure has been reached on its input. The switch may be designed to make contact either on pressure rise or on pressure fall. Pressure switches are widely used in industry to automatically supervise and control systems that use pressurized fluids. Another type of pressure switch detects mechanical force; for example, a pressure-sensitive mat is used to automatically open doors on commercial buildings. Such sensors are also used in security alarm applications such as pressure sensitive floors.

Pneumatic

Uses of pneumatic pressure switches include: Switch a household well water pump automatically when water is drawn from the pressure tank. Switching off an electrically driven gas compressor when a set pressure is achieved in the reservoir Switching off a gas compressor, whenever there is no feed in the suction stage. in-cell charge control in a battery Switching on an alarm light in the cockpit of an aircraft if cabin pressure (based on altitude) is critically low. Air filled hoses that activate switches when vehicles drive over them. Common for counting traffic and at gas stations.

Hydraulic

Hydraulic pressure switches have various uses in automobiles, for example, to warn if the engine's oil pressure falls below a safe level, or to control automatic transmission torque converter lock-up. Prior to the 1960s, a pressure switch was used in the hydraulic braking circuit to control power to the brake lights; more recent automobiles use a switch directly activated by the brake pedal. In dust control systems (bag filter), a pressure switch is mounted on the header which will raise an alarm when air pressure in the header is less than necessary. A differential pressure switch may be installed across a filter element to sense increased pressure drop, indicating the need for filter cleaning or replacement.

Examples

Pressure sensitive mat

A pressure sensitive mat provides a contact signal when force is applied anywhere within the area of the mat. Some mats provide a single signal, while others can resolve the position of the applied force within the mat. Pressure sensitive mats can be used to operate electrically operated doors, or as part of an interlock system to ensure machine operators are clear of dangerous areas of a process before it operates. Pressure sensitive mats can be used to detect persons walking over a particular point, as part of a security alarm system or to count attendance, or for other purposes.

See also

Dynamic pressure List of sensors Pressure sensor

External links

Text derived from https://en.wikipedia.org/w/index.php?oldid=1334115966 under CC BY-SA 4.0; modifications have been made.