This is where you can view Technical Notes and Papers regarding humidity generation and measurement.

This paper was presented by Mr. Jeff Bennewitz in the Humidity Session at the NCSL 2003 International Workshop & Symposium, in Tampa Florida.

• Solving Humidity Calibration Challenges. (74 K) 
• Featured article published in Sensors magazine. (296 k) 

This document describes a Recommended Practice for Intrinsic/Derived Standards (RISP-5) on the two-pressure, two-temperature humidity generator.

• A link to the abstract of this document. (html)

This document describes a complete uncertainty analysis of the Model 1200 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• 1200 Humidity Generator Uncertainty Analysis. (583 K) 

This document describes a complete uncertainty analysis of the Model 1220 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• 1220 Humidity Generator Uncertainty Analysis. (1.10 MB) 
• 1220 Chamber Temperature Uniformity Analysis. (461 K) 

This document describes a complete uncertainty analysis of the Model 2500 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• Relative Humidity Uncertainty Analysis of the Model 2500 Humidity Generator. (262 K) 
• Chamber Temperature Uncertainty Analysis of the Model 2500 Humidity Generator. (15 K) 
• Chamber Temperature Uniformity Analysis of the Model 2500 Humidity Generator. (9 K) 

This document describes a complete uncertainty analysis of the Model 2900 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• Uncertainty Analysis of the Thunder Scientific Model 2900 Two-Pressure Humidity Generator. (1.27 MB) 
• Chamber Temperature Uniformity Analysis of the Thunder Scientific Model 2900 Two-Pressure Humidity Generator. (426 K) 

This document describes a complete uncertainty analysis of the Model 3900 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• Dew/Frost Point Uncertainty Analysis of the Model 3900 Two-Temperature, Two-Pressure Low Humidity Generator. (1 MB) 

This document describes a complete uncertainty analysis of the Model 3920 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• Uncertainty Analysis of the Model 3920 Two-Temperature, Two-Pressure Low Humidity Generator. (1.23 MB) 

This document describes a complete uncertainty analysis of the Model 9500 in accordance with NIST Technical Note 1297. Each error source is identified, quantified, and combined to form an expanded uncertainty using a coverage factor, k=2, at an approximate level of confidence of 95%.

• Uncertainty Analysis of the Model 9500 Two-Pressure Humidity Generator. (1.35 MB) 
• Chamber Temperature Uniformity Analysis of the Model 9500 Two-Pressure Humidity Generator. (584 KB) 

ITS-90 formulas have been developed for vapor pressure, dew/frost point temperatures, and enhancement factors. These formulas are published in the proceedings of the Third International Symposium on Humidity and Moisture, was held in April 1998 at the National Physical Laboratory in the United Kingdom. The vapor pressure and enhancement formulas were developed by conversion of internationally recognized IPTS-68 equations to the ITS-90 temperature data. Formulas for dew and frost point temperatures were then developed to allow easy transition between vapor pressure and the corresponding temperature. All of the formulas mentioned are contained within the following document.

• ITS-90 Formulations for Vapor Pressure, Frostpoint Temperature, Dewpoint Temperature, and Enhancement Factors in the range -100 to +100 °C. (37 K) 

The materials for a Workshop given at the 2000 NCSL Conference are available here for on-line viewing.

• Basic Humidity Definitions. (307 K) 

For more information on how the generators work, click on the How it Works link below.

• How it Works. (html)

This is a copy of the Microsoft Software License Terms for the OEM version of the Windows 10 operating system we use in our systems.

© Microsoft Corporation 2022 - https://www.microsoft.com/en-us/

• SILICA_Microsoft_Win10_LT. (228 K) 

If you have any other questions you can E-mail us at: info@thunderscientific.com

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