Temperature measuring device for a respiratory humidifier

In a temperature-measuring device for a respiratory humidifier with a liquid container, the temperature-measuring device including a flow channel for breathing gas and an infrared detector directed from the outside toward a measurement portion in the flow channel for contactless detection of the temperature of the breathing gas in the flow channel, the improvement comprising:

• a wall surface surrounding and defining the flow channel and having the measurement portion as a section thereof, the measurement portion being flush with surrounding areas of the wall surface without the measurement portion projecting or protruding into the interior of the flow channel;
• and
• a flow guide element within the flow channel, the flow guide element being separate from the wall surface and positioned and configured to deflect the breathing gas stream directly toward the measurement portion at an inflow angle of greater than 10° and less than 170° with respect to the measurement portion.