A device adapted to be arranged at a medium channel for passing a gaseous medium, where the device is adapted for executing an acoustic temperature measurement in the gaseous medium passing the medium channel by means of runtime measurement of an acoustic pulse running through the gaseous medium from at least a first transmitter arrangement to at least a first receiver arrangement, said device comprising the at least first transmitter arrangement and the at least first receiver arrangement, the first transmitter arrangement comprising a sound pulse generator for generating the acoustic pulse, a first acoustic channel and a transmitter for transmitting the acoustic pulse into the medium, the first acoustic channel being of acoustically dispersive design and connecting the sound pulse generator to the transmitter, and, the first receiver arrangement comprising a receiver for receiving the acoustic pulse after it has passed through the medium, a second acoustic channel and a first microphone, preferably a piezoelectric microphone, for detecting the acoustic pulse, the second acoustic channel transmitting the acoustic pulse received by the receiver to the first microphone, the first acoustic channel being curved towards the sound pulse generator in such a way that a radiant heat of the medium on the sound pulse generator can be at least greatly reduced, the at least transmitter arrangement (TA 1) further comprising a second microphone, preferably arranged on the side of the transmitter facing the sound pulse generator, arranged in the first acoustic channel for detecting the back-reflected part of the acoustic pulse, the device further comprising a pulse discriminator designed to determine the arrival times of the recorded acoustic pulses in a suitable way and to transmit them to an evaluation unit of the device designed to determine the temperature of the medium from the runtime of the acoustic pulse from the transmitter to the receiver, taking into account the arrival times determined by the pulse discriminator and the acoustic pulses (RI, AP) detected by first and second microphones (7, 8), characterized in that at least the transmitter comprises an interfering element on its side intended to face the medium to be measured, where the interfering element is arranged to reflect a part of the acoustic pulse back to the first acoustic channel of the first transmitter arrangement. said device comprising the at least first transmitter arrangement and the at least first receiver arrangement, the first transmitter arrangement comprising a sound pulse generator for generating the acoustic pulse, a first acoustic channel and a transmitter for transmitting the acoustic pulse into the medium, the first acoustic channel being of acoustically dispersive design and connecting the sound pulse generator to the transmitter, and, the first receiver arrangement comprising a receiver for receiving the acoustic pulse after it has passed through the medium, a second acoustic channel and a first microphone, preferably a piezoelectric microphone, for detecting the acoustic pulse, the second acoustic channel transmitting the acoustic pulse received by the receiver to the first microphone, the first acoustic channel being curved towards the sound pulse generator in such a way that a radiant heat of the medium on the sound pulse generator can be at least greatly reduced, the at least transmitter arrangement (TA 1) further comprising a second microphone, preferably arranged on the side of the transmitter facing the sound pulse generator, arranged in the first acoustic channel for detecting the back-reflected part of the acoustic pulse, the device further comprising a pulse discriminator designed to determine the arrival times of the recorded acoustic pulses in a suitable way and to transmit them to an evaluation unit of the device designed to determine the temperature of the medium from the runtime of the acoustic pulse from the transmitter to the receiver, taking into account the arrival times determined by the pulse discriminator and the acoustic pulses (RI, AP) detected by first and second microphones (7, 8), characterized in that at least the transmitter comprises an interfering element on its side intended to face the medium to be measured, where the interfering element is arranged to reflect a part of the acoustic pulse back to the first acoustic channel of the first transmitter arrangement.