Apparatus for supplying gases to a patient

An apparatus for the supply of humidified gases to a patient, the apparatus comprising:

• a humidified gases supply supplying the humidified gases,
• a gases supply passage downstream of the humidified gases supply, and upstream of a patient in use, the gases supply passage comprising a conduit through which the humidified gases flows therethrough,
• a first temperature sensor embedded in a wall of the conduit,
• a second temperature sensor provided at a location adjacent to the first temperature sensor, the second temperature sensor being located with the wall of the conduit positioned between the second temperature sensor and gaseous flow of the humidified gases in the gases supply passage, and
• a controller receiving an output of the first and second temperature sensors and configured to derive from the output of the first and second temperature sensors an estimation of a dew point temperature of the humidified gases according to the output of the first and second temperature sensors.