Humidity Generator

2P-2T Humidity Generator has been identified by NCSLI as an intrinsic/ derived standard. It allows independent control of temperature and pressure and easily allowing the measurement of both parameters to be used to determine relative humidity.

These featured generators are using NIST-proven, two-pressure two-temperature humidity calibration systems.  It is the world’s leading manufacturers of metrology grade humidity generator that provides the best solutions to humidity measurement. 

The measuring range varies from 5%rh to 99%rh and -10ºC to +70ºC for high humidity generators.  Its low humidity generator can measure from -95ºC f/dp to +10 ºC f/dp

The uncertainty relative humidity is as low as +0.3%rh to +0.5%rh and the uncertainty of frost/dew point is +0.1ºC to +0.2ºC for low humidity generators. 

Its system is easy to learn, user friendly and automated; coupled with HumiCalc Humidity Calculation Software, it helps to save man-power time and labour cost to achieve high humidity accuracy with confident measurement


The G2 produces highly accurate humidity values based on RH Systems' unique hybrid combination of the NIST proven "two-pressure" and "two-temperature" humidity generation techniques. It delivers a humidified gas stream, accurately controlled to a variety of user selectable humidity parameters such as %RH, dew point, frost point, ppm, or vapor pressure. By accurately measuring the temperature and pressure at the point where the humidified gas is utilized, the G2 automatically adjusts for changes in dynamic conditions such as heat load or ambient pressure variation.


The Model G9 produces highly accurate humidity values based on the NIST proven "two-pressure" humidity generation technique. This system will generate a variety of humidity values such as %RH, dew point, frost point, ppm, or vapor pressure. The system is computer controlled, allowing it to run at fixed points, or multipoint profiles, completely unattended.


The Model 1200 Mini Humidity Generator produces accurate humidity values using the fundamental, NIST proven, “two-pressure” principle.  The 1200 will automatically supply relative humidity, dew point, frost point, and other calculated values for instrument calibration and evaluation as well as precision environmental testing. This system automatically generates multipoint profiles as well as manually entered humidity levels, while continuously storing and printing system data.

Virtually all functions of the 1200 humidity generator are computer controlled.  All desired humidities, temperatures, and time intervals may be programmed.  Visual indications of system status are displayed in real time on the computer screen.  The automated features of the 1200 allow the generation of known humidity levels completely unattended.  This frees the operating technician from the task of monitoring and adjusting.


The Model 2500 Benchtop Humidity Generator is a self contained system capable of producing atmospheres of known humidities using the fundamental, NIST proven, "two-pressure" principle. This system is capable of continuously supplying accurately known humidity values for instrument calibration, evaluation, and verification, as well as for environmental testing. Simply apply power and the 2500 will power-up ready to generate. Humidity setpoint values are input by the operator from the front panel keypad and are limited only by the range of the 2500 humidity generator. Relative humidities are calculated from the measurements of pressure and temperature with the formula:

%RH= fs/ fc · es/ ec · Pc/ Ps · 100

To generate a known humidity, the computer controls the pressure ratio Pc /Ps utilizing the enhancement factor ratio fs/fc and the effective degree of saturation es/ec. Humidity produced is solely dependent on the measurement of pressures and temperatures and does not rely on any other device (such as a dew point hygrometer, psychrometer, or humidity sensor) for the measurement of water vapor content. Precision humidity generation is determined by the accuracy of the pressure measurements and on the accuracy and uniformity of temperature throughout the generating system.


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.