HP480 and HP481

Compressed Air: Relative Humidity Temperature and Dew Point 

Data Logger


Compressed air is often required to have a low humidity level. Measuring the dew point (DP) of water vapour in the compressed air that circulates in the system has many advantages. The HP480 and HP481 probes are designed specifically for this purpose.

  • Prevents corrosion of metal pipes.
  • Prevents the formation of ice inside pipes which can lead to obstruction of the pipes.
  • Prevents bacterial growth.
  • Reduces maintenance costs of pneumatic drives, by maintaining the proper lubrication of moving parts.
  • Improves the quality of products coming in contact with the air.

Process Connections:

HP480 with Chamber with Quick coupling
HP480 with Chamber with G1/2 Connection
HP481 Only


Specification of HP 480 / 481
Relative Humidity
Sensor  Capacitive 0 - 100% RH
Accuracy @ T=15 to 35C ± 1.5%RH (0..90%RH), ± 2%RH (remaining field)
Accuracy @ T=-40 to +60C ± (1.5 + 1.5% of the measured value)%RH
Long term Stability < 1%RH/year
Sensor Pt100
-40 to + 60C
Accuracy ± 0.25 °C
Dew Point
Sensor Parameter calculated from the measurement of temperature and relative humidity
Measuring Range -40…+60 °C DP
Accuracy @ T = 20C ± 2 °C DP (-40…0 °C DP) ± 1 °C DP (0…+20 °C DP)
Accuracy @ T = -40 to +60C
General Features
Ordering Information

Model Description RFQ
HP480  Combined RH Temp DP probe for pipes with 2m cable and (3) 1/4" couplings  E-mail
HP481  Combined RH Temp DP probe for pipes with 2m cable and G 1/2 threading
HD2101.2 HD2101.2 Data logger with free software, batteries, USB cable, carry case. More information here: HD2101 Series Data Logger

Topac Inc.
781 740 8778

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