Relative Humidity (RH) Controller Calibration

How to calibrate RH controller

Check these articles -

RH Instruments Calibration Manual.pdf (1004.0 KB)

RH Instruments Calibration.pdf (239.6 KB)

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Humidity Calibration techniques:

Chilled mirror hygrometers

  • Most accurate and stable in long term
  • Wide range
  • Very expensive
  • Needs skilled operator and maintenance

Capacitive RH hygrometers

  • Easy to maintain to implement in automatic systems
  • Less expensive
  • Hysteresis, temperature dependency
  • Drift may be difficult to predict (especially if operated in extreme ranges)

Psychrometers

  • Rarely used anymore
  • Maintenance (wick, water) and humidifying effect

Spectroscopic

  • Trace humidity range
  • Expensive and sophisticated instruments
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