We are the manufacturer of Kromschorder Make Air Pressure Switch DG 50 U Features: Manufactured by KROM SCHRODER Precision differential pressure switch Monitoring of air, fuel gas and other non-flammable gasses Limit monitor EC type-tested and certified design Special-design pressure switch CE certified Applications: Pressure switches for air DL can be used as positive, negative and differential pressure switches for air, flue gas and other nonflammable or aggressive gases They monitor extremely slight pressure differentials and trigger electrical switching operations when a set value is reached DL..E: Condensing boilers, boiler construction DL..A: Gas-fired installations, fan monitoring, flue-gas monitoring, intake and extract ventilation systems. DL..K: Air-conditioning systems, kitchens,laboratories Specifications: Order Code Description KS-8 444 440 0 DL 3A-3 – Range: 0.2 – 3 mbar KS-8 444 449 0 DL 50A-31 – Range: 2.5 – 50 mbar KS-8 444 449 5 DL 50A-32 – Range: 2.5 – 50 mbar KS-8 444 488 0 DL 150A-31 – Range: 30 – 150 mbar KS-8 444 401 0 DL 1E-1 – Range: 0.2 – 1 mbar KS-8 444 425 0 DL 5E-1 – Range: 0.4 – 5 mbar