Application Pressure switches for air DL can be used as positive pressure switches, vacuum sensors or differential pressure switches for air, flue gas and other non-aggressive gases. They are not suitable for fuel gases. They monitor extremely low pressure differentials. They trigger switch-on, switch-off or switchover operations if a set switching point is reached. This switching point can be adjusted using a hand wheel or, if required, it can be fixed using an adjusting screw. The diaphragm pressure switch with micro switch features particularly high contact reliability as low gas release components are used. DL..K is used in air-conditioning systems and kitchens due to its low adjusting range (from 20 Pa). The pneumatic and electrical connections on DL 3,3 – 40K are accessible from the same side in order to ensure space-saving and easy-to-fit installation. The switching point can be infinitely adjusted using the hand wheel.