A Review of Contact Sensors Used for Monitoring Malodorous Gas in Animal Facilities

Zhang, Shi Rui; Wang, Ji Hua; Dong, Da Ming; Zheng, Wen Gang; Zhao, Xian De

doi:10.4028/www.scientific.net/amr.629.655

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…Thus, it is essential to accurately measure NH 3 concentration inside the building. Nevertheless, electrochemical sensors are often used in real-time monitoring of gaseous emissions in livestock buildings [15,17,25] because of their small size and fast response times [27].…”

Section: Introductionmentioning

confidence: 99%

Linear Models for the Prediction of Animal Zone Ammonia in a Weaned Piglet Building

Arango

Besteiro²,

Ortega

et al. 2021

Agronomy

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Measuring ammonia inside livestock buildings poses many challenges that hinder the incorporation of this variable into environmental control systems. The aim of this study was to measure various microclimate variables inside a weaned piglet building and analyse their interactions with NH3 concentrations for setpoint temperatures of 26 and 25 °C, in order to control NH3 concentrations based on other easily measurable variables. The experimental test was conducted on a conventional farm in Northwest Spain. NH3 concentrations in the animal zone were best correlated with CO2 concentrations in the animal zone (R = 0.91 and R = 0.55) and velocity of air extracted through the fan (R = 0.72 and R = 0.65) for setpoint temperatures of 26 and 25 °C, respectively. Similarly, strong correlations were found with relative humidity in the animal zone and temperature of inlet air. Because NH3 concentration in the animal zone is related to the performance of the ventilation system, strong positive correlations were found between NH3 concentration and temperature of inlet air whereas negative correlations were found between NH3 concentration and ventilation rates. Linear regression models based on CO2 concentrations in the animal zone and temperature of inlet air are recommended, because they provide a good fit for both setpoint temperatures using variables that can be readily measured.

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Section: Introductionmentioning

confidence: 99%

Linear Models for the Prediction of Animal Zone Ammonia in a Weaned Piglet Building

Arango

Besteiro²,

Ortega

et al. 2021

Agronomy

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“…Reported methods for H 2 S gas detection mainly include semiconductor sensors, electrochemical sensors and optical sensors [6]. Various solid-state hydrogen sulfide sensors based on semiconductor metal oxides such as SnO 2 , ZrO 2 , CeO 2 , and WO 3 have been reported in the literature [7].…”

Section: Introductionmentioning

confidence: 99%

An H2S Sensor Based on Electrochemistry for Chicken Coops

Zeng

et al. 2016

Sensors

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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.

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