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https://blondeau.be/wp-content/uploads/2025/03/Fema-VCM.jpg419369FEMA VCM / VNM negative pressure switches or vacuum pressure switches detect the pressure difference relative to atmospheric pressure. All specifications for switching pressure ranges, as well as the scale markings on the devices, should therefore be understood as the pressure difference between atmospheric pressure and the set switching pressure. The “zero” point on the […]