| 摘要 |
A two-wire differential pressure transmitter comprises a pressure sensor 20 having a pressure-sensitive element 21, 22 for converting a change in a pressure into a resistance change to produce an electric signal indicative of the pressure change, a temperature detector 23 having a thermosensitive element 24 disposed in the vicinity of the pressure-sensitive element for generating an electric signal indicative of a change in ambient temperature, a memory 31 for storing in advance data on relationships of the electric signal from the pressure sensor with respect to the pressure and the ambient temperature, an arithmetic and logic circuit 30 responsive to the electric signals from the pressure sensor and the temperature detector for reading corresponding data out of the memory to compute the pressure applied to the pressure-sensitive element, and a circuit 32 for converting an output signal from the arithmetic and logic circuit into an analog electric signal and delivering the latter over a two- wire transmission line. <IMAGE> |
