... EN1854) Italy MADAS SW Series of Air, Gas Pressure Switch is used in a variety of industrial and heating ... /EEC EN1854 and obtained Germany TüV certificate. Pressure Range of Action Point from 0.4 to 500mbar ... : 1 and 2, Positive pressure control Rp1/4"; 3 and 4, Negative pressure control, RP1/8". Model Pressure Range Width ThicknessMW3-A4 0. ... 57mmMW500-A4 100-500mbar 72mm 57mm air/gas pressure switch