Patent ID: 7834656

Claim:
A two-wire transmitter to be connected to two transmission lines which transmit an electric signal regarding a physical quantity detected by a sensor, the two-wire transmitter comprising: a current control section which controls a transmission current of the electric signal; and a starter circuit which starts at a start time of the two-wire transmitter so that the transmission current flowing through the current control section under steady operation of the two-wire transmitter detours the current control section to flow through the starter circuit, wherein the starter circuit stops when an output voltage of the current control section reaches a predetermined value or more after the two-wire transmitter starts; wherein the current control section comprises: a current control circuit connected at one end to one of the transmission lines and at an opposite end to an internal circuit; and a current detection resistor connected at one end to the other of the transmission lines and at an opposite end to a common potential, and the starter circuit comprises: a comparator which compares an output voltage of the current control circuit with a reference voltage; and a switching section which is connected to the current control circuit in parallel and turns on and off according to an output of the comparator.