This pressure switch is mainly used in ventilation and air conditioning systems to control the air flow in the air ducts, as well as in filters, ailerons and fans. They are suitable for air and other non-flammable and non-aggressive gases. This switch is capable of feeling a small change of pressure and widely used to control aerator flow, to monitor and fan and air conditioning. It is also suitable for protection against overheating and frost protection in the industrial refrigeration system. Due to its exceptional design, the set point can be adjusted visually Pressure connection: 6.2mm Internal thread tube or G1 / 8 (optional if the hole) Electrical connection: screw terminals AMP6.3mm connector; AMP4.8mm connector Operating temperature: -30Celsius 85Celsius (overpressure 5000 Pa) p Installation is quick and easy, both vertical and horizontal p extremely high adjustment accuracy p long life and stable operation Suitable for medium: air, non-corrosive gas. Range: 30～300Pa Accuracy : Repeatability Less than +/- 1% times full scale; Service life : Greater than 106 switching cycles colour:Gray Material:plastic size:81 x 53mm Package Contents: 4 x Micro- differential pressure switch