Method for monitoring a transmitter and corresponding transmitter

A transmitter, comprising:

• a signal transmission element that is part of a field bus,
• a measurement unit for determining a measurement quantity and producing a measurement signal which is dependent on the measurement quantity determined,
• a transmission unit that is interconnected with the measurement unit at least for transmission of signals, and being adapted for receiving the measurement signal from the measurement unit and transferring an electrical output signal to the signal transmission element based on the measurement signal,
• a connecting line for transmitting energy between the measurement unit and the transmission unit, and
• a storage unit,
• wherein the transmission unit is adapted for inputting an electrical signal taken from the signal transmission element and to transfer a comparison signal, which is dependent on the signal input from the signal transmission element, to the measurement unit,
• wherein the transmission unit and the measurement unit are constructed and matched to one another such that the transmission unit is able to induce a determination of the measurement quantity by the measurement unit,
• wherein the measurement unit is made to transmit the measurement signal to the transmission unit and to receive the comparison signal from the transmission unit,
• wherein the measurement unit has at least one comparison unit,
• wherein the comparison unit is adapted to compare the comparison signal to a signal stored in the storage unit, and to produce a comparison result based thereon, and
• wherein the measurement unit depending on the comparison result transfers either the measurement signal to the transmission unit or transfers an error signal to the transmission unit by acting on the connecting line so as to set an energy demand outside of a given normal range.