Thunder Scientific 3920 Automated Low Humidity Generation System

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.

  • Traceable to SI 1
  • High Flow Capability of 10 L/min
  • Based on NIST Proven “Two-Pressure” Principle
  • 3920 ControLog® Embedded Automation Software
  • HumiCalc® with Uncertainty Mathematical Engine
  • Generate: Frost Point, Dew Point, PPM, %RH
  • Calculated Real-Time Uncertainty
  • Calculated Water Capacity to Indicate Water Usage
  • Multi-point Touch LCD
  • Added Keyboard Interface
  • Frost Point Temperature Range: -95 to 0.01 °C
  • Dew Point Temperature Range: -50 to 10 °C
  • Parts Per Million Range: 0.04 to 12300 PPMv
  • Relative Humidity Range: 0.00003% to ~50%
  • Temperature Specification: 0.027 °C
  • Saturation Temperature Range: 3 -80 to 12 °C
  • Saturation Temperature Control Stability: 4 0.008 °C
  • Saturation Temperature Cooling Rate: from 12 to -80 °C 0.33 °C per Minute average)
  • Saturation Temperature Heating Rate: from -80 to 12 °C 0.33 °C per Minute (average)
  • Test Temperature Range (measured): 0 to 50 °C
  • Saturation Pressure Range: ~Ambient to 250 psiA
  • Saturation Pressure Specification: 0.02% of full scale
  • Test Pressure Range (measured): Ambient to 50 psiA
  • Test Pressure Specification: 0.02% of full scale
  • Gas Type: Gaseous Nitrogen or CO2 free
  • Air Supply Pressure Range: 80 to 300 psiG
  • Supply Pressure Specification: ±1 psiG
  • Gas Flow Rate Range: 0.5 to 10 SLPM
  • Gas Flow Rate Resolution: 0.2 SLPM
  • Gas Flow Rate Specification: 2% of full scale
  • Display Resolution: 0.001
  • Refrigeration: 1/3 HP R-134A & 1/3 HP R-23 in cascade
  • Heating: Stainless Steel Immersion
  • Test Port & Gas Inlet: 1/4 Inch Swagelok VCR®
  • Physical Dimensions: 37.9″ H x 23″ W x 34.9″ D (96.5 cm x 58.4 cm x 88.6 cm)

Chilled Mirror Hygrometers: Connecting the generator output to a chilled mirror hygrometer allows the user to verify the mirror temperature measurement accuracy; perform operational checks on the hygrometer components; determine whether the hygrometer is controlling the mirror in the liquid phase or ice phase when operating 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 a electrolytic hygrometer, sampling system, special fixtures, or sensors allows the user to calibrate and/or characterize humidity sensitivity; 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 3920 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.

  • Model ACS3920 CO2 Free Dry Air Compressor System
  • Low Pressure Transducer (LPT-50)
  • High Pressure Transducer (HPT-250)
  • Pressure Reducing Regulator (PRREG)
  • 4 Port Heated Manifold (4PHM)