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Model 9500 -Automated Humidity Generator
The Model 9500 Humidity Generator is a system capable of producing known humidity values using the fundamental, NIST proven, “two-pressure” principle. The 9500 is capable of continuously supplying an accurately known relative humidity, dew point, frost point, parts per million, or other calculated values for instrument calibration and evaluation as well as precision environmental testing. This system will automatically generate manually entered humidity and temperature set points as well as user created multipoint humidity and temperature profiles. All desired humidity’s, temperatures, test pressures, flow rates, and time intervals may be programmed. Visual indications of system status are displayed in real time on the computer monitor.
- 0.17% * R + 0.016 RH Uncertainty 5,6
- Traceable to SI 8
- High Flow Capability
- Based on NIST Proven Two-Pressure Principle
- Generate: RH, DP, FP, PPM, Multipoint Profiles
- Computerized Internal Transducer Calibration
- Computes System Uncertainties in Real Time
- Automatically Applies Enhancement Factors
- ControLog® Automation Software
The “two-pressure” humidity generation process involves saturating air or nitrogen with water vapor at a known temperature and pressure. The saturated high pressure air flows from the saturator, through a pressure reducing valve, where the air is isothermally reduced to test pressure at test temperature. Humidity generation by the 9500 does not depend upon measuring the amount of water vapor in the air, but rather is dependent on the measurements of temperature and pressure alone. System precision is determined by temperature and pressure measurement accuracy, and on the constancy of the measurements throughout. When setpoint equilibration has been reached, the indication of saturation temperature, saturation pressure, test temperature, and test pressure, may be used in the determination of all hygrometric parameters.
The Model 9500 Humidity Generator encompasses a high-performance stand-alone Data Acquisition/Computer that performs all functions required for humidity generation and control. The Data Acquisition System employs 24 bit I/O modules with integrated signal conditioning to acquire data and control the operation of generating humidity. The Computer utilizes an embedded based operating system in conjunction with specialty software to control and interface with the human to machine interface (HMI) computer running ControLog. ControLog is an embedded software application that fully automates the operation of the Thunder Scientific 9500 Humidity Generator and allows various device connections through a number of different interfaces. Data from the generator and attached devices is automatically retrieved and stored for viewing in either numerical or graphical format in real time or post process. Data can be transferred off the system via a USB drive for further viewing, post processing and printing using an external Windows PC (not included). The ControLog software also provides the primary interface to the operator via the multi-point touch LCD and keyboard.