Pressure monitor system

The pressure monitoring system comprising a first cavity of the isolating film separating (11) and second cavity (12). The isolating film is arranged in the SAW device of each ends of; the SAW device with different and frequency. The speed of the second cavity (12) opposite to the first cavity (11) pressure and a a isolating film displacement; detachable toothpaste the speed of SAW device and frequency with left to obtain pressure difference between the pressure chamber. The picture seats, a measuring device of vehicle tyre valve assembly, wherein the tire air inflating, the inflating pressure is arranged on the first cavity and reference value, the loss of any afterward second cavity (12), for carrying section of the flat-tire, wherein wherein the isolating film with the displacement, and making the corresponding output of SAW device is installed.