Thunder Scientific

3920 Automated Low Humidity Generation System

Self-contained system capable of producing atmospheres of known humidity using the fundamental “two-pressure” principle

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The Model 3920 Low Humidity Generation System is a self-contained system capable of producing atmospheres of known humidity using the fundamental “two-pressure” principle. This system is capable of continuously supplying frost point, dew point, parts per million, relative humidity and other calculated values for instrument calibration and evaluation as well as for precision environmental testing. This system will automatically generate manually entered humidity as well as user created multipoint profiles. Visual indications of system status are displayed in real time on the computer monitor.

The “two-pressure” humidity generation process involves saturating nitrogen with water vapor at a known temperature and pressure. The saturated high-pressure gas is then reduced to test pressure and warmed to test temperature. The indication of saturation temperature, saturation pressure, test temperature, and test pressure is used in the determination of all hygrometric parameters. Humidity generation by this system does not depend upon measuring the amount of water vapor, but it is dependent on the measurements of temperature and pressure alone. The precision of the system is determined by the accuracy of the temperature and pressure measurements and on the constancy of them throughout.
 
 
• Traceable to SI 1
• High Flow Capability of 10 L/min
• Based on NIST Proven "Two-Pressure" Principle
• HumiCalc® with Uncertainty Mathematical Engine
• ControLog® Embedded Automation Software
• Generate: Frost Point, Dew Point, PPM, %RH
• Calculated Real-Time Uncertainty
• Multi-point Touch LCD
• Additional Keyboard Interface
• Calculated Water Capacity to Indicate Water Usage
Physical Dimensions: 37.9" H x 23" W x 34.9" D (965mm x 585mm x 889mm)
Test Port: 1/4 Inch Swagelok VCR®
Heating: Stainless Steel Immersion
Refrigeration: 1/3 HP R-134A & 1/3 HP R-23 in cascade
Display Resolution: 0.001
Gas Flow Rate Specification: 2% of full scale
Gas Flow Rate Resolution: 0.2 SLPM
Gas Flow Rate Range: 0.5 to 10 SLPM
Supply Pressure Specification: ±1 psiG
Supply Pressure Range: 80 to 300 psiG
Gas Type: Gaseous Nitrogen
Test Pressure Specification: 0.02% of full scale
Test Pressure Range (measured): Ambient to 50 psiA
Saturation Pressure Specification: 0.02% of full scale
Saturation Pressure Range: ~Ambient to 250 psiA
Test Temperature Range (measured): 0 to 50 °C
Saturation Temperature Heating Rate: from –80 to 12 °C 0.5 °C per Minute (average)
Saturation Temperature Cooling Rate: from 12 to –80 °C 0.5 °C per Minute (average)
Saturation Temperature Control Stability: 0.008 °C
Saturation Temperature Range:–80 to 12 °C
Temperature Specification: 0.027 °C
Relative Humidity Range: 0.00003% to ~50%
Parts Per Million Range: 0.04 to 12300 PPMv
Frost/Dew Point Uncertainty:–50 °C to 10 °C: 0.01% |R| + 0.07 °C
≥ –90 °C 0.05% |R| + 0.07 °C
< –90 °C 2% |R| –1.7 °C
0 °C to 50 °C 0.034 °C
Dew Point Temperature Range: –50 to 10 °C
Frost Point Temperature Range: –95 to 0.01 °C
• Chilled Mirror Hygrometers
• Humidity Sensors and Electrolytic Hygrometers
• Environmental Testing
 
  • Thumbnail of document Data Sheet - 3920 Automated Low Humidity Generation System
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    Data Sheet - 3920 Automated Low Humidity Generation System

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  • Thumbnail of document Manual - 3920 Automated Low Humidity Generation System
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    Manual - 3920 Automated Low Humidity Generation System

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