Model PT04 differential pressure transmitters using imported diffusion silicon core body specially designed for measuring small range differential pressure has the very good stability and reliability.High precision better shock pressure suitable for measuring various compatible with 316 stainless steel in the medium. By changing the way of pressure connection can easily measure the negative pressure by selecting the pressure composite measuring method can measure the bidirectional composite pressure. Due to the unique double core technology reverse overload stress level has been greatly enhanced small size high cost performance.