S904 Humidity Calibrator

The S904 is a completely stand-alone and transportable humidity calibrator, requiring no external services other than mains power. The calibration chamber features 5 interchangeable ports to accommodate virtually any brand, type or model of humidity sensor. This calibrator is ideal for companies or organizations looking to calibrate large numbers of probes in a laboratory or field setting.

Product Features

  • Simple operation and maintenance
  • Easy calibration of relative humidity sensors
  • Excellent chamber stability and uniformity
  • Manual control or optional straightforward automated set point programming
  • Optional in-built data-logging for reference probe and probes under calibration
  • Humidity and temperature controlled chamber
  • Generate 10 to 90% RH over +10 to +50°C temperature
  • Transportable to allow on-site calibrations

Technical Specifications

Generation Range 10-90% RH
Control Element
≤±1% RH (10–70% RH)
≤±1.5% RH (70–90% RH)
Stability ±0.2% RH (20–80% RH)
Generation Range +10 to +50°C
(Lowest T set point = 10°C below ambient)
Accuracy ±0.1°C
Stability ±0.1°C
Ramp Rate from
   +20 to +40°C
   +40 to +20°C

0.7°C minute
Control Element Removable relative humidity sensor
Probe Ports up to 5 – sensor body diameters 5 to 25mm accommodated by port adapters
Chamber Volume 2000cm³
Chamber Dimensions 105 x 105 x 160mm (h x w x d)
Instrument Dimensions 290 x 520 x 420mm (h x w x d)
Set Point Resolution 0.1 for humidity and temperature
Displays 3 digit LED, 10mm characters
Supply 85 to 264 V AC, 47/63 Hz, 150 VA
Weight 20kg



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