title: An H₂S Sensor Based on Electrochemistry for Chicken Coops.
abstract: The recent modernization of the livestock industry lags behind the scale of the livestock industry, particularly in indoor environmental monitoring. In particular, the H₂S gas concentration in chicken coops affects the growth and reproductive capacity of the chickens and threatens their health. Therefore, the research and development of a low-cost, environmentally friendly sensor that can achieve on-line monitoring of H₂S gas has a notably important practical significance. This paper reports the design of an H₂S gas sensor, with selection of an electrochemical probe with high accuracy and wide measurement range using the relatively mature technology of electrochemical sensors. Although the probe of the sensor is the main factor that affects the sensor accuracy, the probe must be combined with a specifically designed signal condition circuit that can overcome the lack of an electrode to satisfy the requirements for the interconnection and matching between the output signal and the test instrument. Because the output current of the electrochemical electrode is small and likely to be disturbed by noise, we designed signal-conditioning modules. Through the signal-conditioning circuit, the output signal of the current electrode can be converted into a voltage and amplified. In addition, we designed a power control module because a bias voltage is necessary for the electrode. Finally, after the calibration experiment, the accurate concentration of H₂S gas can be measured. Based on the experimental analysis, the sensor shows good linearity and selectivity, comparatively high sensitivity, perfect stability and an extremely long operating life of up to two years.
authors: Beijing Engineering and Technology Research Center for Internet of Things in Agriculture, China Agricultural University, Beijing 100083, China. zlh52103@gmail.com.|College of Mechanical and Electrical Engineering, Agricultural University of Hebei, Baoding 071001, China. zlh52103@gmail.com.|Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China. zlh52103@gmail.com.
authors: Lihua
authors: L
authors: Zeng
authors: Beijing Engineering and Technology Research Center for Internet of Things in Agriculture, China Agricultural University, Beijing 100083, China. lll333@163.com.|Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China. lll333@163.com.
authors: Mei
authors: M
authors: He
authors: Beijing Engineering and Technology Research Center for Internet of Things in Agriculture, China Agricultural University, Beijing 100083, China. yhh1990@126.com.|Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China. yhh1990@126.com.
authors: Huihui
authors: H
authors: Yu
authors: Beijing Engineering and Technology Research Center for Internet of Things in Agriculture, China Agricultural University, Beijing 100083, China. dliangl@cau.edu.cn.|Key Laboratory of Agricultural Information Acquisition Technology, Ministry of Agriculture, China Agricultural University, Beijing 100083, China. dliangl@cau.edu.cn.
authors: Daoliang
authors: D
authors: Li
mesh_terms: D000818:Animals; D015374:Biosensing Techniques / Q000295:instrumentation*; D002138:Calibration; D002645:Chickens; D004563:Electrochemistry / Q000295:instrumentation*; D006799:Housing, Animal; D006862:Hydrogen Sulfide / Q000032:analysis*; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D006862:Hydrogen Sulfide
keywords: H2S gas; coop; sensor