LF30 Air differential pressure switch Dimensi LF30 Order Ref NO LF30 -4 111 -P70Pa-100Pa A B C D Pressure setting in pa:P=Positive V=Vacuum ON:100Pa OFF:70Pa The LF30 employs a differential pressure to actuate a precision snap switch at chosen pressure setting. This may be the difference between atmospheric and a negative or positive pressure or between any two given pressures. When a change of pressure occurs between the negative pressure chamber and the positive pressure chamber the main diaphragm activates the snap switch at a pre-determined value. Number Electiral Rating Terminals K