In scientific research and production, the accuracy of the differential pressure transmitter is higher and higher, range is smaller and smaller, the current verification regulation of JJG8822004 “Verification regulation of pressure transmitter” has not been able to solve the dissemination of value of quantity in the measurement and use of the differential pressure transmitter. The zero output problem of differential pressure transmitter caused by radial Angle is studied. The results showed that the radial Angle serious impact on the output of the differential pressure transmitter. Small radial Angle may cause measuring error exceed the maximum permissible error. In view of the introduction of error is analyzed, ensure the correct use and measurement of differential pressure transducer by a technical point, ensure the dissemination of accurate and reliable.