The highlights

Controlled Humidity Generator

The WETSYS is a stand alone, simple and robust system designed to generate atmospheres with a controlled humidity level.


  • Accurately controlled atmospheres with humidity levels up to 95% RH
  • Operations with gases such as air, He, Ar, N2, CO2
  • A heated transfer line with a standard connection for coupling to SETARAM thermal analyzers and calorimeters, to third party instruments, or to climate chambers
  • Analog outputs for RH and temperature data acquisition
  • An optional external relative humidity probe for in-situ RH regulation


Pre-calibrated for various gases Air, He, N2, CO2, Ar
Flow rate 3 to 50ml/min
10 to 200ml/min (optional)
Heated transfer line Ambient to 100°C
Gas humidity RTa to 50°C 0% RHb; 5-95% RH
Gas humidity 50°C to 70°C 0% RHb; 5-90% RH
Humidity profiles generation Constant RH, steps, ramps
Autonomy > 1000 hoursc
Accuracy +/- 0.8% RH
+/- 0.1°C
Stability +/- 0,3% RH
External RH probe Optional
Interface Eurotherm 2704
Storage capacity Up to 20 profiles
Dimension 42 / 35 / 53 cm (16.5 / 13.8 / 20.9 in)
Weight 22 kg (48.5 Ibs)

a. Room Temperature / b.Operation with dry gas: saturator isolation via automatic valve switching / c. at 70 °C, 90% RH and 20ml/min.


Humidity is known to considerably affect the properties of many products such as energetic materials, polymers, pharmaceutical materials, foodstuff, plasters, cements, thermal energy storage materials, metals and alloys, etc.

To evaluate the influence of humidity on the properties or long term stability of these products, it is necessary to study their specific behavior under relative humidity controlled atmospheres.

A huge database is in the Application Library area of our website. We have also included a powerful search engine that will enable you to find the most applicable data.


Application notes

This is an extract of our documentation, please register to have access to all documentation

Gas Humidity Generator : Wetsys par SETARAM