Michell Instruments
Chilled Mirror Hygrometers – Reference Measurement of Dew Point and Humidity
For applications where measurement accuracy is critical, chilled mirror hygrometers from Michell Instruments provide a reliable reference method for measuring dew point and relative humidity. These instruments use a fundamental measurement principle that delivers highly stable and drift-free results.
Chilled mirror hygrometers are widely used in calibration laboratories, research environments, and precision industrial processes where accurate humidity measurement is essential for quality control and regulatory compliance.
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Absolute humidity measurement using the chilled mirror principle
Unlike many humidity sensors that rely on indirect measurement methods, chilled mirror hygrometers measure dew point using a direct physical principle.
A small mirror surface inside the instrument is gradually cooled until condensation forms on the mirror. Optical sensors detect the exact moment when condensation appears, allowing the instrument to determine the dew-point temperature with high precision.
Because this method measures the actual thermodynamic dew point, it provides an absolute reference for humidity measurement. The measurement is inherently stable and does not suffer from the long-term drift that can occur with some sensor-based technologies.
This makes chilled mirror hygrometers ideal for reference measurements, calibration, and validation of other humidity instruments.
Key features for precision humidity measurement
- Direct dew-point measurement using the chilled mirror principle
- High accuracy and repeatability for reference-grade measurements
- Drift-free measurement method based on a physical condensation process
- Wide measurement ranges covering very dry to high humidity conditions
- Stable long-term performance suitable for calibration environments
- Integrated temperature and humidity calculations
- Robust laboratory and industrial designs
Typical applications for chilled mirror hygrometers
Chilled mirror hygrometers are used wherever precise humidity measurement is required for process validation or calibration.
Common applications include:
- Calibration laboratories and metrology institutes
- Pharmaceutical and life science manufacturing
- Semiconductor and electronics production
- Environmental and climate research
- Validation of humidity sensors and transmitters
- Quality assurance in controlled environments
In these environments, reliable reference measurements help ensure that other instruments remain accurate and compliant with industry standards.
Benefits for your operation
Using a chilled mirror hygrometer as a reference instrument provides confidence in your humidity measurements.
You benefit from:
- Reference-grade accuracy for critical measurements
- Reliable calibration of other humidity instruments
- Stable measurements without long-term sensor drift
- Improved quality control in humidity-sensitive processes
- Confidence in compliance with laboratory and industrial standards
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