Patent ID: 7924017

Claim:
A measuring device, comprising: a housing; a measuring probe included in the housing, the measuring probe having a terminal in the housing and constituting an external interface to the housing; a transmitter external to the housing and including a first processor; and a cable connected to the first processor and the terminal, wherein the measuring probe comprises: at least one memory unit; a first signal wire connected to a terminal, which is configured to be connected to the first processor of the transmitter; a second processor configured to: process measuring signals of the measuring probe; communicate the processed measuring signals to the first processor of the transmitter via the first signal wire and the terminal; read operating data recorded in the at least one memory unit; transmit the read operating data to the first processor via the first signal wire and the terminal; receive operating data from the first processor via the first signal wire and the terminal; and write the received operating data into the at least one memory unit; a reference electrode; a measuring electrode; a multiplexer including a first input, a second input, and an output, the output of the multiplexer being connected to the second processor; a first impedance converter connected between the reference electrode and the first input of the multiplexer; and a second impedance converter connected between the measuring electrode and the second input of the multiplexer; wherein the multiplexer has a third input, wherein the measuring probe comprises a differential amplifier including a first input, a second input, and an output, the output of the differential amplifier being connected to the third input of the multiplexer, and wherein the first and second inputs of the differential amplifier are respectively connected to outputs of the first and second impedance converters.