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Inst Tools > Blog > Common > Comparison of Humidity Sensors – Industrial Instruments

Comparison of Humidity Sensors – Industrial Instruments

The humidity sensors come in various types and are used to measure the moisture content in the air. Learn the comparison.

Last updated: September 30, 2023 10:24 am
Editorial Staff
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The humidity sensors come in various types and are used to measure the moisture content in the air.

Comparison of Humidity Sensors

Comparison of Humidity Sensors - Industrial Instruments

The table outlines the key features of commonly used types of humidity sensors:

ParameterCapacitiveResistiveThermal ConductivityGravimetricPsychrometerOpticalHair Hygrometer
Principle of OperationDielectric constant varies with humidityResistance varies with moistureThermal conductivity varies with humidityAbsorbed water weightWet-bulb and dry-bulb temperature differenceLight scattering or absorptionHair length changes with humidity
Humidity RangeWide (0 to 100%)Moderate (10 to 90%)Wide (0 to 100%)Limited (20 to 90%)Wide (0 to 100%)Moderate (20 to 90%)Wide (20 to 100%)
AccuracyHighModerateModerate to HighVery HighModerateModerateLow to Moderate
Response TimeFastModerateModerateSlowModerateFastSlow
SensitivityHighModerateModerateHighModerateModerateLow
CostModerate to HighLowHighVery HighLow to ModerateModerate to HighLow
Temperature SensitivityModerateHighLowModerateModerateLowModerate
MaintenanceLowModerateModerateHighModerateLowModerate
Ease of InstallationEasyModerateModerateDifficultModerateModerateEasy
Safety AspectsGenerally SafeGenerally SafeGenerally SafeGenerally SafeGenerally SafeGenerally SafeGenerally Safe

Here’s a brief explanation of the terms used:

  • Principle of Operation: The underlying mechanism or physics that allows the sensor to measure humidity.
  • Humidity Range: The range of humidity levels the sensor can accurately measure.
  • Accuracy: The level of precision in humidity measurement.
  • Response Time: How quickly the sensor can respond to changes in humidity.
  • Sensitivity: How much the output changes for a given change in humidity.
  • Cost: The relative cost involved in purchasing and installing the sensor.
  • Temperature Sensitivity: The sensor’s responsiveness to changes in temperature, which may affect its accuracy.
  • Maintenance: The level of upkeep required to keep the sensor in optimal condition.
  • Ease of Installation: How easy or difficult it is to install the sensor.
  • Safety Aspects: Safety considerations, are mainly relevant if the sensor is used in hazardous or extreme conditions.

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