Low Humidity Generator, Model 3900
In stock
Reconfirm the price with seller
- Customer pickup,
- Courier
- In detail
Products of other enterprises
Description
FEATURES
Traceable to NIST
Based on NIST Proven Two-Pressure Principle
Push Button (Keypad) Control
Automated Control of User Setpoints
Automatically Applies Enhancement Factors
Computerized Internal Transducer Calibration
RS-232C Serial Interface
Only Nine Square Feet of Floor Space
Timed/Formatted Output to Printer
Battery Backed-up Real Time Clock
Backlit Liquid Crystal Display
DESCRIPTION
The Model 3900 Low Humidity Generator is an extremely accurate means of producing known humidity values for calibrating and verifying humidity instrumentation. Based on the combined, NIST proven, fundamental "two-pressure" and "two-temperature" principles, this system will automatically supply a continuous humidified gas stream, within the frost/dew point range of -95.0 °C to 10.0 °C, for days or even weeks unattended. Simply apply power to the system, and the 3900 will power-up ready to purge and/or generate. Humidity setpoint values are input by the operator from the front panel keypad and are limited only by the operational range of the 3900 humidity generator.
PRINCIPLE OF OPERATION
The "two-pressure two-temperature" generation process involves saturating a continuous stream of air or nitrogen with water vapor at a known temperature and pressure. The saturated high pressure air then passes through an expansion valve where it expands to a lower pressure. The 3900 generates a particular humidity by first selecting a suitable saturation temperature, Ts. It then determines the saturation pressure, Ps, required to establish the correct saturation vapor pressure. The precision of the system is determined by the accuracy of the temperature and pressure measurements and on the constancy of them 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. Furthermore, because the humidity generated is based solely on the fundamental principles of temperature and pressure, no humidity sensing is used to measure or control the amount of water vapor produced by this system. The 3900 operates using an on board multifunction CPU in conjunction with other peripheral cards to perform calculation and control functions. The embedded computer control system allows the 3900 to generate known humidity levels completely unattended with visual indications of system status displayed in real time on the Liquid Crystal Display.
Traceable to NIST
Based on NIST Proven Two-Pressure Principle
Push Button (Keypad) Control
Automated Control of User Setpoints
Automatically Applies Enhancement Factors
Computerized Internal Transducer Calibration
RS-232C Serial Interface
Only Nine Square Feet of Floor Space
Timed/Formatted Output to Printer
Battery Backed-up Real Time Clock
Backlit Liquid Crystal Display
DESCRIPTION
The Model 3900 Low Humidity Generator is an extremely accurate means of producing known humidity values for calibrating and verifying humidity instrumentation. Based on the combined, NIST proven, fundamental "two-pressure" and "two-temperature" principles, this system will automatically supply a continuous humidified gas stream, within the frost/dew point range of -95.0 °C to 10.0 °C, for days or even weeks unattended. Simply apply power to the system, and the 3900 will power-up ready to purge and/or generate. Humidity setpoint values are input by the operator from the front panel keypad and are limited only by the operational range of the 3900 humidity generator.
PRINCIPLE OF OPERATION
The "two-pressure two-temperature" generation process involves saturating a continuous stream of air or nitrogen with water vapor at a known temperature and pressure. The saturated high pressure air then passes through an expansion valve where it expands to a lower pressure. The 3900 generates a particular humidity by first selecting a suitable saturation temperature, Ts. It then determines the saturation pressure, Ps, required to establish the correct saturation vapor pressure. The precision of the system is determined by the accuracy of the temperature and pressure measurements and on the constancy of them 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. Furthermore, because the humidity generated is based solely on the fundamental principles of temperature and pressure, no humidity sensing is used to measure or control the amount of water vapor produced by this system. The 3900 operates using an on board multifunction CPU in conjunction with other peripheral cards to perform calculation and control functions. The embedded computer control system allows the 3900 to generate known humidity levels completely unattended with visual indications of system status displayed in real time on the Liquid Crystal Display.
Contact the seller
Low Humidity Generator, Model 3900
We recommend to see