![]() The inlet pressure (H) exerts pressure upon the operating piston (D), generating a force opposing the range spring (C). This depth change allows the spring resistant force to increase or decrease, which correlates to a set pressure to trigger the micro-switch. To set the pressure level at which the micro-switch switches between NC and NO, the trip-setting nut (G) changes the spring pocket depth. Then, the piston triggers the micro-switch (A), moving it between normally closed (NC) and the normally open (NO) position through an operating pin (B) and an insulated trip button (E).įigure 4: The components of a pressure switch include: micro-switch (A), operating pin (B), range spring (C), operating piston (D), insulated trip button (E), switch case (F), trip setting nut (G), inlet pressure (H) ![]() In short, the inlet pressure pushes a piston (D) against a spring (C) that has a known resistant force. All of the components are inside the switch case (F), and it has one inlet pressure port (H). The pressure switch shown in Figure 4 is an example of a single pole double throw (SPDT) switch, which has a mechanical operation principle. Figure 3 is an example of an electric pressure switch. are some functions that can be adjusted by the user according to the requirements.Įlectronic pressure switches are suitable for automated and controlled equipment systems that require programmable function, digital display, flexibility, accuracy, ingress protection, and stability. Switch point, output signals, hysteresis, delay time, etc. The switch point can be manufacturer set or can be programmed on-site according to the application requirements. They have digital displays to set up the switching function. Electronic pressure switchĪn electronic pressure switch uses an electrical pressure sensor to measure the change in inlet pressure. Figure 2 is an example of a mechanical pressure switch. We have an article on how to adjust mechanical pressure switches. They can be used to make a contact change for an increase or decrease in pressure. The mechanical pressure switch is better suited for handling high voltages and amperages than an electronic pressure switch. Changeover contacts are for both NO and NC operation. These pressure switches usually have three different types of contact: normally open (NO), normally closed (NC), and changeover (SPDT) contacts. The manufacturer defines the hysteresis, and for most mechanical switches, it is not configurable by the user. Often this is expressed as a percentage of the switch point value, for example, 20%. The difference between the switch point and reset point is called hysteresis. When the pressure drops, the switch resets to its original state. The spring pretension directly correlates to the pressure at which the switch makes an electric contact. ![]() The spring is the opposing force to the inlet pressure and the springs pretension is adjusted with a set screw or knob. The relay should be used to switch the higher amperage loads such as the compressor while the pressure switch can be used to activate the relay as the relay load is low.A mechanical pressure switch uses a spring and a diaphragm, or piston, to control at what pressure the micro-switch is triggered. Note, we recommend pressure switches are used in conjunction with a relay. The thread is 1/4" NPT and matches the our range of air compressor tanks. Ideal for use with the range of Scintex and Sherpa 4WD air compressors and air tanks. Different switches provide different setting options depending on your end use requirements. The pressure switch is ideal for maintaining a on-board air tank at pressure. ![]() As the air in the tank is used and the pressure falls, the switch will reactive and close reactivating the compressor at the lower set point of 85 PSI. This means if you power your compressor via the pressure switch, it will run and build pressure until the 105 PSI set point is reached at which point the circuit will open and the compressor will stop. Depending on the requirement, pressure switches are used with mechanical or electrical switch contacts, with or without displays and with various setting possibilities.Įach pressure switch has a pressure set it will open and close at, for example SSPS085 has settings of 85PSI/105PSI. A pressure switch opens or closes a corresponding switch contact as soon as a preset pressure is reached.
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