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Cleanroom Control and Environmental Monitoring Systems
Humidity Sensor
A capacitive relative-humidity sensor that measures cleanroom moisture with a protected sensing element and serviceable wall or duct housing.
- Capacitive RH Measurement
- Replaceable Sensor Filter
- Low-Drift Signal Conditioning
- Wall or Duct Format
Product Introduction
The cleanroom humidity sensor uses a capacitive polymer element whose electrical response changes with water-vapor concentration. A protective membrane or porous filter shields the element from particles and incidental contact while allowing moisture diffusion. Signal conditioning linearizes and temperature-compensates the RH output for connection to environmental monitoring or HVAC controls. Wall versions use a compact ventilated enclosure; duct versions place a filtered probe into the airstream while keeping wiring accessible outside the duct.
Key Features
A replaceable filter protects the sensitive element from dust and handling contamination.
Temperature compensation reduces humidity error caused by normal room-temperature variation.
Wall and duct formats place the same sensing principle at the appropriate measurement location.
Customer Product Concerns
Humidity measurement is vulnerable to contamination, local condensation and unsuitable mounting locations that do not represent the room air.
Cleaning residue coats the humidity element and causes slow drift.A replaceable protective filter reduces direct contamination and simplifies service.
Condensation temporarily saturates the sensor after a cold-air event.A hydrophobic filter and appropriate probe placement reduce liquid-water contact.
A wall pocket measures stagnant air rather than the occupied zone.Ventilated housing and considered mounting height expose the element to representative circulation.
Long field wiring adds noise to a low-level sensor signal.Integrated active signal conditioning provides a robust current, voltage or digital output.
Typical Applications
Cleanroom relative humidity monitoringAHU supply-air measurementStability roomsElectronics humidity control
Technical Parameters
Typical materials and dimensions for a cleanroom capacitive humidity sensor are listed below.
| Core Material | Capacitive polymer RH element with hydrophobic membrane in polycarbonate wall or probe housing |
|---|---|
| Panel Thickness | 25-45 mm wall-sensor depth |
| Effective Width | 80-120 mm wall housing width |
| Maximum Length | Duct probes up to 300 mm |
| Steel Facing Thickness | 0-0.8 mm; optional stainless probe tube |
| Core Density | 1180-1220 kg/m³ for polycarbonate housing |
| Thermal Conductivity | 0.19-0.22 W/(m·K) for polycarbonate enclosure material |
| Surface Finish | Smooth white wall housing or satin stainless probe with white electronics head |
| Joint Type | Snap-fit wall enclosure or threaded duct flange with replaceable filtered sensor cap |
| Customization | Available based on the intended application and operating environment. |
Available Options
Wall or duct probeVoltage, current or digital outputReplaceable membrane filterRemote probe cable
Planning a Humidity Sensor specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
