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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