2900 Automated Humidity Generation System
Self contained system capable of producing atmospheres of known humidities using NIST proven, two-pressure principle, 0.5% of reading RH uncertainty, multi-point touch LCD
The Model 2900 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 relative humidity, dew point, frost point, parts per million, or other calculated values for instrument calibration and evaluation as well as for precision environmental testing. This system will automatically generate manually entered humidity and temperature set points as well as user created multipoint profiles. All desired humidity’s, temperatures, flow rates, and time intervals may be programmed.
• Traceable to SI
• 0.5% of Reading RH Uncertainty
• High Flow Capability of 50 L/min
• Based on NIST Proven "Two-Pressure" Principle
• HumiCalc® with Uncertainty Mathematical Engine
• ControLog® Embedded Automation Software
• Generate: RH, DP, FP, PPM, Multipoint Profiles
• Externally Driven Chamber Fan
• Multi-point Touch LCD
• Fluid Jacketed Chamber Door
• Window Chamber Door (Option)
| Relative Humidity Range | 10 to 95 %RH, 10 to 40 L/min |
| Relative Humidity Range | 95 to 98 %RH, 10 to 20 L/min |
| Frost Point Temperature Range | –33.60 to 0 °C |
| Dew Point Temperature Range | –36.94 to 70 °C |
| Chamber Temperature Range | –10 to 72 °C |
| Chamber Temperature Control Stability | 0.002 °C |
| Chamber Temperature Uniformity | <0.04 °C |
| Chamber Temperature Heating Rate (-10 to 72 °C) | 0.5 °C per Minute (average) |
| Chamber Temperature Cooling Rate (72 to 0 °C) | 0.3 °C per Minute (average) |
| Chamber Temperature Cooling Rate (0 to –10 °C) | 0.05 °C per Minute (average) |
| Chamber Temperature Specification | 0.027 °C |
| Gas Type | Air or Nitrogen |
| Gas Pressure Rating | 175 psiG |
| Gas Flow Rate Range | 10 to 50 L/min |
| Gas Flow Rate Specification | 5% of full scale |
| Saturation Pressure Range | Ambient to 160 psiA |
| Saturation Pressure Specification | 0.02% of full scale |
| Test Chamber Pressure Range | Ambient |
| Test Chamber Pressure Specification | 0.02% of reading |
| Display Resolution | 0.001 |
| Test Chamber Dimensions | 12" x 12" x 10" (304.8 mm x 304.8 mm x 254 mm) |
| Physical Dimensions | 22" H x 36" W x 23" D (558.8 mm x 432 mm x 584.2 mm) |
| Uncertainty | |
| RH Uncertainty: 10 to 95 %RH, 0 to 70 °C, 10 to 40 L/min | 0.5% of reading |
| RH Uncertainty: 95 to 98 %RH, 0 to 70 °C, 10 to 20 L/min | 0.5% of reading |
| Dew/Frost Point Uncertainty: < 0.01 °C, 10 to 40 L/min | 0.05 °C |
| Dew Point Uncertainty: 0.01 to 70 °C, 10 to 40 L/min | 0.08 °C |
| Test Chamber Temperature Uncertainty: -10 to 72 °C | 0.031 °C |
| Traceable to the International System of Units (SI) through NIST-maintained standards. | |
| The system will limit mass flow rate to 30 L/min for %RH greater than 90 when the temperature is 50 °C or higher. | |
| The system will limit mass flow rate to 20 L/min for %RH greater than 95. | |
| Using glycol/water as the temperature heat transfer fluid from –10 to 72 °C. Note: the 2900 can only operate for a finite amount of time at or below 0 °C. | |
| Temperature Control Stability is defined as the standard deviation over a 10-minute period, as measured by the saturation temperature control sensor after being at point for 60 minutes. | |
| Chamber Temperature Uniformity is defined as the maximum temperature difference between any two locations at a single point in time. Locations are within one inch of the chamber wall and within 2.5 inches of the chamber door. | |
| Using a minimum chamber fan speed of 25% for a temperature range of –10 °C to 72 °C when using fluid jacket door option and ±10 °C from ambient when not. | |
| Chamber pressure at 1 atmosphere. Uncertainty values represent an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%. | |
| Uncertainty is not specified at temperatures below 0 °C or at flow rates below 10 L/min. Uncertainty is based on the worst-case value from the 2900 uncertainty analysis. | |
| Utilities | |
| Electrical Power | 200-230 V~, 5 A, 1 Ø, 50/60 Hz |
| Gas Supply | 175 psiG @ 50 L/min |
| Environmental | |
| Operating Temperature | 15 to 30 °C |
| Storage Temperature | 0 to 50 °C |
| Humidity | 5 to 95% Non-condensing |
Humidity Sensors and Chart Recorders: Insert humidity probes through a test port in the chamber or install the sensing systems into the chamber to: 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 the repeatability, stability, hysteresis, and drift characteristics of various humidity sensing systems.
Chilled Mirror Hygrometers: Install the actual chilled mirror head into the chamber or insert a sample tube through the test port and draw a sample through the chilled mirror head to: verify mirror temperature measurement 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’s repeatability, stability, and drift characteristics.
Humidity Sensors And Chart Recorders: Insert your humidity probes through a test port in the chamber or install the hygrothermograph into the chamber 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 the repeatability, stability, hysteresis, and drift characteristics of various humidity sensing systems.
Environmental Testing: The 2900 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.
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