Humidity generator with calibration system 9500

computer-controlled

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. FEATURES •0.3% of Reading RH Uncertainty 4,5 •Traceable to SI 6 •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 PRINCIPLE OF OPERATION 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.