Features
Traceable to NIST
Based on NIST Proven Two-Pressure Principle
Push Button (Keypad) Control
Automated Control of User Setpoints
3900 ControLog® Automation Software
HumiCalc® with Uncertainty Software
Automatically Applies Enhancement Factors
Computerized Internal Transducer Calibration
RS-232C Serial Interface
Only Nine Square Feet of Floor Space
Timed/Formatted Output to Printer
Battery Backed-up Real Time Clock
Backlit Liquid Crystal Display
Key Specifications
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%.
Typical Applications
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 heatpump 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.