Long-term and stable detection of H2S in a pig house at low operating temperature based on Ce2O3/In2O3 hollow microspheres with a remote monitoring system

A remote system for real time monitoring of H2S in a pig house combining with a new type of gas sensor fabricated via Ce2O3/In2O3 hollow microspheres (HMS) was successfully built. The microstructure and morphology of the microspheres and their gas sensing performance were investigated in detail. At optimal operating temperature (100 celcius), the Ce2O3/In2O3 HMS composite exhibited excellent sensing properties towards H2S, which afforded a linear response range from 0.10 to 100 ppm with a detection limit of 0.06 ppm and a short response time of 59 s. Compared with In2O3 based sensor, the Ce2O3/In2O3 HMS sensor presented not only low power consumption for efficient energy-saving, but also even high response ability. After 10 months of continuous monitoring of H2S gas in pig farm via Alibaba Cloud transmission network, only 5.4% of the sensor's response attenuated was found, indicating that the HMS based sensor had a long-term stable service lifetime suitable for remote monitoring in practical scene. Moreover, the sensor presented good thermo-and humidity -stability with good reproducibility and selectivity, making it an excellent monitor for H2S in atmospheric environment on livestock-raising field.

Automated summary

A remote system for real time monitoring of H2S in a pig house was built using Ce2O3/In2O3 hollow microspheres (HMS) gas sensor. The sensor showed excellent performance in detecting H2S, with a linear response range from 0.10 to 100 ppm, a detection limit of 0.06 ppm, and a short response time of 59 s. The sensor demonstrated long-term stability and good thermo-and humidity-stability, making it suitable for remote monitoring in practical scene.