Abstract
In this research, an improved psychrometer is developed to solve practical issues arising in the relative humidity measurement of challenging drying environments for meat manufacturing in agricultural and agri-food industries. The design in this research focused on the structure of the improved psychrometer, signal conversion, and calculation methods. The experimental results showed the effect of varying psychrometer structure on relative humidity measurement accuracy. An industrial application to dry-cured meat products demonstrated the effective performance of the improved psychrometer being used as a relative humidity measurement sensor in meat-drying rooms. In a drying environment for meat manufacturing, the achieved measurement accuracy for relative humidity using the improved psychrometer was ±0.6%. The system test results showed that the improved psychrometer can provide reliable and long-term stable relative humidity measurements with high accuracy in the drying system of meat products.
Highlights
Relative humidity is at all temperature and pressures defined as the ratio of the water vapour pressure to the saturation water vapour pressure at the gas temperature [1]
This paper introduces an improved measurement device of aspirating psychrometer with specific construction parameters and provided real test results that are conducted in a meat-drying room in a food company
This paper focused on a discussion of the application for the relative humidity measurement device in a current control system in challenging environments, in particular, the drying system for dry-cured meat products
Summary
Relative humidity is at all temperature and pressures defined as the ratio of the water vapour pressure to the saturation water vapour pressure (over water) at the gas temperature [1]. Cai et al designed an intelligent dry and wet bulb relative humidity sensor, with simulation and test results demonstrating the accuracy to within 2% RH [27]. The psychrometer avoids directly exposing the relative humidity sensing element to the measurement environment This key difference allows the psychrometer to be used in difficult measurement environments. From the above discussion and the literature, it is clear that the psychrometer has been widely used as a method for relative humidity measurement over a wide range of values in a harsh environment, with varying degrees of measurement accuracy. The research analyzed the accuracy, stability, and reliability of the specific improved psychrometric measurement method based on a real-time temperature and relative humidity process control system
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