Long-Term Loading Effect on Stability and Spatial Uniformity of Climatic Chambers

Andrés J Bohórquez, Sergio A. Carvajal, Ciro A. Sánchez, Astrid Riveros

Abstract

In this work, a study of the impact that the commonly-known ‘loading effect’ has over the determination of inhomogeneity and temporal stability of a climatic chamber is presented. Consecutive yearly characterizations of a twopressure humidity generator treated as a climatic chamber revealed that the spatial inhomogeneity strongly depends on the environmental conditions of the laboratory as well as the percentage of the work volume occupied by ‘loading devices’, such as capacitive thermohygrometers. Results show that temperature and relative humidity measurements can vary as much as 0.4 °C and 0.1 %HR, respectively, if the load occupies at least 40% of the work volume. The effect on stability is considerably lower and in the worst case is 0.01 °C and 0.06 %HR.

Keywords

Climatic chamber, characterization, uniformity, stability

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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