Consistency of the national realization of dew-point temperature using NIS standard humidity generators

Abstract

Abstract. A comparison of two standard humidity generators (two-temperature (2-T) and one-temperature (1-T) generators) that are developed by the National Institute for Standards (NIS) has been performed using a transfer standard chilled-mirror hygrometer and measurement procedures to realize dew-point temperature T d in the range from À50°C to 0°C. The main objective of this comparison was to compare the realizations of dew-point temperature and to establish the level of consistency between the two generators. For a level of consistency between two measurements, it is expressed by the difference between the measured values, m 1 À m 2 , and the expanded pair uncertainty of this difference U p [1]. The comparison measurements revealed dew-point temperature differences of 0.02°C and 0.07°C with expanded pair uncertainties of ±0.09°C and ±0.15°C.

Uncertainly Analysis of Two Types of Humidity Sensors by a Humidity Generator with a Divided-Flow System

“…In the RH range of 13–98%, the measurement uncertainty ranged from ±0.25% to 0.67% RH. El-Galid ad Ahmed [ 14 ] established two types of two-temperature humidity generators and found the measurement uncertainty of dew-point temperature in the range from ±0.09 °C to ±0.15 °C for the air temperature, ranging from −50 °C to 0 °C.…”

Determination of Al2O3 Powder Thermal Conductivity Using DSC at NIS-Egypt

“…This measurement has become a major concern. This study aims to determine the thermal conductivity coefficient of an unknown powder sample as one of the applications that can be used as a differential thermal analysis device (DSC) to meet the customers' requests, as there is a wide range of applications approved in several scientific and technical sectors to determine the thermal conductivity of powdered materials [10][11][12].…”