A Smart Rig for Calibration of Gas Sensor Nodes.

Mohieddine A Benammar,Sabbir H M Ahmad,Mohammed Al-Hitmi,Damiano Crescini,Farid Touati,Hasan Tariq,Abderrazak Abdaoui

doi:10.3390/s20082341

Mohieddine A Benammar, Sabbir H M Ahmad + Show 5 more

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https://doi.org/10.3390/s20082341

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Abstract

Electrochemical gas sensors require regular maintenance to check and secure proper functioning. Standard procedures usually involve testing and recalibration of the sensors, for which working environments are needed. Periodic calibration is therefore necessary to ensure reliable and accurate measurements. This paper proposes a dedicated smart calibration rig with a set of novel features enabling simultaneous calibration of multiple sensors. The proposed calibration rig system comprises a gas mixing system, temperature control system, a test chamber, and a process-control PC that controls all calibration phases. The calibration process is automated by a LabVIEW-based platform that controls the calibration environment for the sensor nodes, logs sensor data, and best fit equation based on interpolation for every sensor on the node and uploads it to the sensor node for next deployments. The communication between the PC and the sensor nodes is performed using the same IEEE 802.15.4 (ZigBee) protocol that the nodes also use in field deployment for air quality measurement. The results presented demonstrate the effectiveness of the sensors calibration rig.

Highlights

Gas sensors are used in various monitoring of air quality and control applications
We found that the wait time depends on the gas flow rate used in the flow rate used in the experiments, thetubing, volume of the tubing, onchamber, the environmental experiments, on the volumeon of the on the environmental on the number chamber, of sensor on the number of sensor nodes the chamber, onofthe response time of sensors
We presented a new practical calibration rig system that is dedicated to gas sensors for outdoor and indoor air-quality monitoring

Summary

Introduction

Gas sensors are used in various monitoring of air quality and control applications. Some types of these sensors are used for monitoring and controlling the combustion processes [1,2,3]. Gas sensors may be used in electronic olfaction schemes for odor detection and identification [7,8,9,10]. Different types of gas sensors are used for detecting hazardous gases in mines, petrochemical installations, and other applications [13,14,15,16]. Gas sensors are widely used for the monitoring of air quality for indoor and outdoor environments

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