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Model 3920 -Automated Low Humidity Generator
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
- 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
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.
The 3920 Low Humidity Generation System encompasses a high-performance stand-alone Control System that performs all functions required for humidity generation and control. The Control System employs 24 bit I/O modules with integrated signal conditioning to acquire data and uses serial interfaces to transducers and stepper motors to control the operation of generating humidity. The Control System utilizes an embedded operating system in conjunction with specialty software to control and interface with the human to machine interface (HMI) computer that runs Thunder`s automation software called ControLog.
ControLog is an embedded software application that fully automates the operation of the 3920 Low Humidity Generation System and allows various device connections through a number of different interfaces. ControLog uses Thunder Scientific’s HumiCalc with Uncertainty as its mathematical engine for computing all humidity values and real-time uncertainties. 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. The ControLog software also provides the primary interface to the operator via the multi-point touch LCD which allows the user to select humidity parameters, pressure, temperature, and flow units. The Parameter Tab is the primary interface for the user and is divided in two sections, Control and Calculated Humidity. Within each tab there are two different tiles, the Setpoint Tile is for the user to enter the desired setpoints and a Value Tile displays the Actual Value.