For acquiring the data required the Relative Humidity of air at the outlet a Hygrometer is used. The probe of the hygrometer is placed into the flow as well as the thermo couple temperature sensor.

Following are the specifications of the hygrometer-thermometer.

HTC 306 Hygrometer-Thermometer-

  1. Measurement Range: Relative Humidity: 0 to 100%RH                                      Temperature [K type thermocouple]: -40 to 1000 degree celcius
  2. Humidity measurement: Probe consisting of Humidity sensor
Hygrometer display
Probe Inside the pipe
Hygrometer

Source: http://www.amazon.in/HTC-Instrument-HD-306-Temperature-Thermometer/dp/B0140T7QXK/ref=sr_1_25?ie=UTF8&qid=1483442377&sr=8-25&keywords=htc+instrument