3900 Humidity Generator

• Frost Point Uncertainty: * (–70 to 10 °C) 0.1 °C (<–70 °C) 0.2 °C
• Frost Point / Dew Point Range: –95 to +10 °C
• Frost Point Resolution: 0.01 °C
• Parts Per Million Range: 0.05 to 12000 PPMv
• Relative Humidity Range: 0.0002 to 50%
• Saturation Pressure Range: Ambient to 300 psiA
• Saturation Pressure Uncertainty (10-50 psiA): * 0.05
• Saturation Pressure Uncertainty (50-300 psiA): * 0.30
• Saturation Pressure Resolution (10-100 psiA): 0.01
• Saturation Pressure Resolution (100-300 psiA): 0.1
• Saturation Temperature Range: –80 to +15 °C
• Saturation Temperature Uncertainty: * 0.08 °C
• Saturation Temperature Resolution: 0.01 °C
• Saturation Temperature Heating/Cooling Rate: 2 Minutes Per °C Average
• Gas Flow Rate Range: 0.1 to 5 slpm
• Gas Flow Rate Resolution: 0.02 slpm

*Represents an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

Virtually any humidity may be generated, for any length of time, within the operational limits of the generator. The output of the device under test may then be compared with the generator’s printed data for analysis.

Chilled Mirror Hygrometers

Connect the generator output to your chilled mirror hygrometer and you can: verify mirror temperature measurement accuracy (calibration) when the hygrometer is in thermal equilibrium with its environment; perform operational checks of the heat pump and optical components, before and after mirror cleaning and balancing; determine whether the hygrometer is controlling the mirror deposit in the liquid phase or ice phase when operating at dew and frost points below 0 °C; determine if the hygrometer is correctly calculating other humidity parameters; determine hygrometer repeatability, stability, and drift characteristics.

Humidity Sensors and Electrolytic Hygrometers

Connect the generator output to your Electrolytic Hygrometer, sampling system, special fixtures, or sensors and you can: determine humidity calibration accuracy and/or characterize humidity sensitivity by subjecting the humidity sensor to a variety of humidity levels; perform operational checks such as the sensing systems capability to correctly calculate and display other humidity parameters; determine repeatability, stability, hysteresis, and drift characteristics of various humidity sensing systems.

Environmental Testing

The 3900 can serve as a test bed for evaluation and R&D of humidity sensors, humidity sensing systems, and humidity sensitive products, e.g., polymers, composites, film, magnetic medium, pharmaceuticals, soil hydrology, consumables, electronics, optics, etc.