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Air compressor pressure switch12/2/2023 Some pressure switches have only 1 connection, some have multiple ports of different sizes, so there is always one that suits your compressor.Ĭompressed air connection on bottom of pressure switch Most commonly used sizes/types are 1/4", 3/8" or 1/2" NPT female. The physical connection, where the compressed air is connected to the pressure switch is often called 'connection type', 'port type' or 'flange type'. Some pressure switches are designed to mount directly to a tank, other are designed to be installed in a control cabinet and are connected by tubes to the compressed air system. Most pressure switches only go up to 8 or 9 bar (125 psi), which is quite useless if you have a 13 or even 30 bar compressor. More on this on our setting your pressure switch page.Īlso, make sure the maximum pressure rating of your pressure switch exceeds your maximum compressed air pressure. Both upper and lower setpoint are fixed in the factory and can not be changed. Only the upper setpoint can be set/changed and the lower setpoints follows automaically at a set distance (fixed pressure differential). Both upper and lower setpoint can be set individually Regarding pressure setpoints, we can devide pressure switches in the following groups: The difference between the lower and upper setpoint is called the pressure-band or pressure differential. Most pressure switches on air compressors are set to open (cut-out) at around 7 bar, and close (cut-in) at around 5.5 bar. These points are also called the cut-in and the cut-out points. The pressure setpoints are the pressure values where the pressure switches form 'on' to 'off and vice-versa. 1-phase models only have 1 set of contacts, for 1-phase motors or for small-current control signal to the main controller (on big air compressors).Įlectrical connections on a single phase pressure switch. 3-phase pressure switches have 3 separate contacts for 3-phase motors. Then there are 3-phase and 1-phase models. The power rating of the pressure switch has to exceed the power rating of the compressor motor! The control signal is then fed into the central controllor or is used directly to switch on and off large contactors or motor starters.ĭirect motor switching pressure switches are only seen on smaller air compressor, with relatively small motors, let's say up to 10 kW (about 13 hp). Other pressure switches can only switch on and off a small control signal. Some pressure switches are capable of directly switching on and off the electric motor. The number and power rating (size) of these contacts vary. Inside the pressure switch, there are 1 or more electrical contacts that open and close according to the pressure. This type is normally seen on larger air compressor, where the electric motor is started and stopped by external relays/contactors or motor starters. It is always in 'auto' mode, and it will open and close it's electrical contacts according to the pressure. On many pressure switches, there is no 'on/auto/off' switch. This type is found mainly on smaller (reciprocating) air compressor, where to motor is directly started and stopped by the pressure switch electrical contacts (see also 'electrical contacts' further down this page). This is basically an all-in-one solution for small compressors. When you press 'off' it will ignore the setpoints and shut down the compressor.Īir compressor pressure switch with OFF / AUTO selection When you press 'on' or ' auto' it will automatically start and stop the compressor according to the set pressure setpoints. Most of the time this basically is the same thing (the wording depends on the manufacturer). Some pressure switches have an on/off or and auto/off switch. Most pressure switches, especially on air compressors will have more than of of the following. Note that this is not an or-or list, but rather an and-and list. So, what types of pressure switches are there?Here's a basic overview of the different models and options available. Some are very basic and not adjustable, while other are very flexible or have extra options. While all pressure switches have the same purpose (switch on or off at a certain pressure), pressure switches come in a lot of different design and types. Air pressure switch models and options, a perfect pressure switch for every application.
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