Low-cost sensor system for monitoring the oil mist concentration in a workshop
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RESEARCH ARTICLE
Low-cost sensor system for monitoring the oil mist concentration in a workshop Hongsheng Zhang 1 & Siyi Zhang 1 & Wuxuan Pan 1 & Zhengwei Long 1 Received: 2 April 2020 / Accepted: 16 November 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Metalworking fluids used in industrial workshops may present a major threat to the health of workers who have been exposed to a high oil mist concentration over a long period of time. Therefore, monitoring the temporal and spatial distribution of particulate matter concentration has great practical significance for the control of oil mist. Traditional particle monitors are generally cumbersome, expensive, and difficult to maintain, which to some extent restricts their extensive use in workshops. Recent years have witnessed tremendous developments in the area of low-cost sensors, which are of great help in obtaining high-density pollution data. In this paper, we evaluate the performance of an inexpensive laser sensor (A4-CG) during long-term oil mist monitoring in a machine shop for the first time. With the use of Lora technology, we developed an online oil mist monitoring network to access real-time concentration, temperature, and humidity information from distributed monitors. According to the results, the sensor data correlated well with measurements by the reference instrument (R2 = 0.96), which means that the distributed sensor network can accurately detect the concentration level of oil mist in the workshop. In fact, most of the sensors demonstrated stable operation for up to half a year according to cluster analysis, while several sensors exhibited serious data drift. Furthermore, the results indicate that the peak oil mist concentration in most areas during production exceeded the value of 0.5 mg m−3 recommended by NIOSH, and it was found that appropriately lowering the relative humidity can make sampling more accurate, while lowering the temperature can reduce the oil mist concentration in the workshop. Thus, measures to control oil mist such as generation and distribution of pollution sources should be on the agenda. Keywords Industrial workshop . Oil mist . Concentration . Low-cost sensor . Lora
Introduction Particulate matter (PM), which refers to a mixture of solid particles and liquid droplets dispersed in an aerosol system, is a key factor in air pollution. According to statistics, million of deaths are caused by air contamination every year (Cohen et al. 2005). A previous study indicated that the human respiratory system is influenced to varying degrees by particles of various sizes (Giusto et al. 2018). Lately, researchers have focused on fine particles with aerodynamic diameters less than 2.5 μm (PM2.5) because these particles greatly affect multiple Responsible editor: Philippe Garrigues * Zhengwei Long [email protected] 1
Tianjin Key Laboratory of Indoor Air Environmental Quality Control, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China
systems in the human body, potentia
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