Air pressure switches take use of pressure difference to facilitate the precise operation of microswitches under the setting pressure. The pressure difference comes from the atmosphere and positive pressure or negative pressure or any 2 different given pressures. If the positive pressure chamber and the negative pressure chamber change, the primary diaphragm will activate the micro-switch at the preset value.
Application: it can detect the air flow in strong traction equipments and give the signal of positive and negative zero air motion; it can automatically turn off the blocked heating pipe and air conditioner; it can supervise weak or dangerous burning; it can give indication if the filter is too dirty, blocked, etc.
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