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.
Highlights
In recent years, livestock production has become an industrial-scale process, where several thousand cattle or pigs and 100,000 or more chickens are fed grains and produced in a single facility [1].Because the scale of production and intensification of the livestock industry continues to increase, environmental control is always a concern issue for livestock producers
The results show that the thehas sensor high repeatability
We found that the gas concentration measured by this sensor was was used
Summary
Livestock production has become an industrial-scale process, where several thousand cattle or pigs and 100,000 or more chickens are fed grains and produced in a single facility [1]. Because the scale of production and intensification of the livestock industry continues to increase, environmental control is always a concern issue for livestock producers. Various toxic gases are produced in the coops because of increased breeding density and the closed environment. The monitoring and control for H2 S can be neglected because of the generally low H2 S gas concentration in chicken coops. Long-term living in the environment with malodorous gases causes livestock to grow slowly, affects livestock breeding and increases the susceptibility of air-spread disease. The health of humans and livestock in an environment with a long-term low H2 S gas concentration can be seriously affected [2]. Effective monitoring of the H2 S gas concentration in animal
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