China
Africa
Explore chapters and articles related to this topic
The Sputtered Thin Films as the Sensing Materials for the MEMS Gas Sensors
Published in Sam Zhang, Materials for Devices, 2023
Hairong Wang, Xin Tian, Yankun Tang
The electrochemical gas sensors usually include ion-selective electrode type, constant potential type, galvanic cell type, and limiting current type. in a traditional electrochemical sensor, the electrolyte is liquid, which makes the sensor difficult to miniaturize. The solid-state electrochemical gas sensor usually consists of a solid electrolyte, a sensing electrode, and a reference electrode. The gas sensors based on the solid electrolyte may be potentiometric type, mixed potential type, or amperometric type according to the testing methods.
Evaluation of Measured Digital Output of Gas Sensors During Spontaneous Heating of Coal
Published in IETE Technical Review, 2019
Subhash Kumar, P. K. Mishra, Jitendra Kumar
Ideally, an electrochemical gas sensor should only react with target gas to be monitored. However, cross-sensitivity does occur even if most of the sensors are somewhat specific. Cross-sensitivity is defined as sensor’s reaction to an interfering gas available in the vicinity. This condition causes an error in the measurement of the target gas [18]. For example, in the present study, 3MEF carbon monoxide sensor has been used which is having the cross sensitivity of ∼60% against hydrogen. It means if the concentration of 20 PPM of hydrogen is present in the target region and if the target gas (CO) is absent, in spite of that the actual value of CO reading will be seen 20*(60/100), i.e. 12 PPM on the display of the analyzer due to sensor’s reaction with hydrogen. A similar phenomenon takes place in case of other electrochemical-based gas sensors as mentioned in Table 4.
Characterization of emissions from burning methyl-bromide-treated crop biomass
Published in Journal of the Air & Waste Management Association, 2022
Johanna Aurell, Brian Gullett, Dirk Helder, Robert Elleman
CO2 was continuously measured using non-dispersive infrared (NDIR) instrument (LICOR-820 model, LI-COR Biosciences, USA). CO was monitored using an electrochemical gas sensor (model e2V EC4-500-CO, SGX Sensortech, United Kingdom) which measures CO concentration by means of an electrochemical cell through CO oxidation and changing impedance. The CO2 and CO sensors were calibrated and checked for drift on a daily basis in accordance with U.S. EPA Method 3A (2017b). An Ecotech Serinus 2000 (American Ecotech, Warren, RI, USA) precision gas divider, was used to dilute the high-level span gases for acquiring the mid-point concentrations for the CO2 and CO calibration curves.