Here are the Perfect Sensor to Measure dew point Temperature in the compressed Air/N2.
Measurement range: -80 to 60 °C Td
Response time: Accuracy: +/-2 °C
Volume concentration (ppm): 20...200,000 ppm
Analog output (scalable): 4 - 20 mA (3-wire technology)
Supply voltage: 18-24VDC
Pressure range: 20bar Max
Housing / protection class: IP65
Process Connection: ½” BSP(M)