The Experts below are selected from a list of 9108 Experts worldwide ranked by ideXlab platform
George W Kling - One of the best experts on this subject based on the ideXlab platform.
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long term reliability of the figaro tgs 2600 Solid State methane Sensor under low arctic conditions at toolik lake alaska
Atmospheric Measurement Techniques, 2020Co-Authors: Werner Eugster, James A Laundre, Jon Eugster, George W KlingAbstract:Abstract. The TGS 2600 was the first low-cost Solid-State Sensor that shows a response to ambient levels of CH4 (e.g., range ≈1.8 –2.7 µmol mol−1 ). Here we present an empirical function to correct the TGS 2600 signal for temperature and (absolute) humidity effects and address the long-term reliability of two identical Sensors deployed from 2012 to 2018. We assess the performance of the Sensors at 30 min resolution and aggregated to weekly medians. Over the entire period the agreement between TGS-derived and reference CH4 mole fractions measured by a high-precision Los Gatos Research instrument was R2=0.42 , with better results during summer ( R2=0.65 in summer 2012). Using absolute instead of relative humidity for the correction of the TGS 2600 Sensor signals reduced the typical deviation from the reference to less than ±0.1 µmol mol−1 over the full range of temperatures from −41 to 27 ∘C . At weekly resolution the two Sensors showed a downward drift of signal voltages indicating that after 10–13 years a TGS 2600 may have reached its end of life. While the true trend in CH4 mole fractions measured by the high-quality reference instrument was 10.1 nmol mol - 1 yr - 1 (2012–2018), part of the downward trend in Sensor signal (ca. 40 %–60 %) may be due to the increase in CH4 mole fraction because the Sensor voltage decreases with increasing CH4 mole fraction. Weekly median diel cycles tend to agree surprisingly well between the TGS 2600 and reference measurements during the snow-free season, but in winter the agreement is lower. We suggest developing separate functions for deducing CH4 mole fractions from TGS 2600 measurements under cold and warm conditions. We conclude that the TGS 2600 Sensor can provide data of research-grade quality if it is adequately calibrated and placed in a suitable environment where cross-sensitivities to gases other than CH4 are of no concern.
Jon Eugster - One of the best experts on this subject based on the ideXlab platform.
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long term reliability of the figaro tgs 2600 Solid State methane Sensor under low arctic conditions at toolik lake alaska
Atmospheric Measurement Techniques, 2020Co-Authors: Werner Eugster, James A Laundre, Jon Eugster, George W KlingAbstract:Abstract. The TGS 2600 was the first low-cost Solid-State Sensor that shows a response to ambient levels of CH4 (e.g., range ≈1.8 –2.7 µmol mol−1 ). Here we present an empirical function to correct the TGS 2600 signal for temperature and (absolute) humidity effects and address the long-term reliability of two identical Sensors deployed from 2012 to 2018. We assess the performance of the Sensors at 30 min resolution and aggregated to weekly medians. Over the entire period the agreement between TGS-derived and reference CH4 mole fractions measured by a high-precision Los Gatos Research instrument was R2=0.42 , with better results during summer ( R2=0.65 in summer 2012). Using absolute instead of relative humidity for the correction of the TGS 2600 Sensor signals reduced the typical deviation from the reference to less than ±0.1 µmol mol−1 over the full range of temperatures from −41 to 27 ∘C . At weekly resolution the two Sensors showed a downward drift of signal voltages indicating that after 10–13 years a TGS 2600 may have reached its end of life. While the true trend in CH4 mole fractions measured by the high-quality reference instrument was 10.1 nmol mol - 1 yr - 1 (2012–2018), part of the downward trend in Sensor signal (ca. 40 %–60 %) may be due to the increase in CH4 mole fraction because the Sensor voltage decreases with increasing CH4 mole fraction. Weekly median diel cycles tend to agree surprisingly well between the TGS 2600 and reference measurements during the snow-free season, but in winter the agreement is lower. We suggest developing separate functions for deducing CH4 mole fractions from TGS 2600 measurements under cold and warm conditions. We conclude that the TGS 2600 Sensor can provide data of research-grade quality if it is adequately calibrated and placed in a suitable environment where cross-sensitivities to gases other than CH4 are of no concern.
Werner Eugster - One of the best experts on this subject based on the ideXlab platform.
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long term reliability of the figaro tgs 2600 Solid State methane Sensor under low arctic conditions at toolik lake alaska
Atmospheric Measurement Techniques, 2020Co-Authors: Werner Eugster, James A Laundre, Jon Eugster, George W KlingAbstract:Abstract. The TGS 2600 was the first low-cost Solid-State Sensor that shows a response to ambient levels of CH4 (e.g., range ≈1.8 –2.7 µmol mol−1 ). Here we present an empirical function to correct the TGS 2600 signal for temperature and (absolute) humidity effects and address the long-term reliability of two identical Sensors deployed from 2012 to 2018. We assess the performance of the Sensors at 30 min resolution and aggregated to weekly medians. Over the entire period the agreement between TGS-derived and reference CH4 mole fractions measured by a high-precision Los Gatos Research instrument was R2=0.42 , with better results during summer ( R2=0.65 in summer 2012). Using absolute instead of relative humidity for the correction of the TGS 2600 Sensor signals reduced the typical deviation from the reference to less than ±0.1 µmol mol−1 over the full range of temperatures from −41 to 27 ∘C . At weekly resolution the two Sensors showed a downward drift of signal voltages indicating that after 10–13 years a TGS 2600 may have reached its end of life. While the true trend in CH4 mole fractions measured by the high-quality reference instrument was 10.1 nmol mol - 1 yr - 1 (2012–2018), part of the downward trend in Sensor signal (ca. 40 %–60 %) may be due to the increase in CH4 mole fraction because the Sensor voltage decreases with increasing CH4 mole fraction. Weekly median diel cycles tend to agree surprisingly well between the TGS 2600 and reference measurements during the snow-free season, but in winter the agreement is lower. We suggest developing separate functions for deducing CH4 mole fractions from TGS 2600 measurements under cold and warm conditions. We conclude that the TGS 2600 Sensor can provide data of research-grade quality if it is adequately calibrated and placed in a suitable environment where cross-sensitivities to gases other than CH4 are of no concern.
Derek J Fray - One of the best experts on this subject based on the ideXlab platform.
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A bielectrolyte Solid-State Sensor which detects SO3 independently of O2: Implications for a SO2 Sensor
Solid State Ionics, 1996Co-Authors: D J Slater, R. V. Kumar, Derek J FrayAbstract:A Solid-State Sensor based upon a Na2SO4-NASICON couple surrounded by yttria-stabilized zirconia (YSZ) is shown to respond to changes in PSO3 independently of PO2 and PSO2. In this mode, both electrodes are exposed to the same test gas eliminating the need for a separate reference compartment. This greatly increases the life of the Sensor. The same Sensor has been successfully adapted to measure SO2 by utilizing a catalyst to convert SO2 to SO3 by a factor which is constant at a given PO2 and temperature as governed by thermodynamic equilibrium.
James A Laundre - One of the best experts on this subject based on the ideXlab platform.
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long term reliability of the figaro tgs 2600 Solid State methane Sensor under low arctic conditions at toolik lake alaska
Atmospheric Measurement Techniques, 2020Co-Authors: Werner Eugster, James A Laundre, Jon Eugster, George W KlingAbstract:Abstract. The TGS 2600 was the first low-cost Solid-State Sensor that shows a response to ambient levels of CH4 (e.g., range ≈1.8 –2.7 µmol mol−1 ). Here we present an empirical function to correct the TGS 2600 signal for temperature and (absolute) humidity effects and address the long-term reliability of two identical Sensors deployed from 2012 to 2018. We assess the performance of the Sensors at 30 min resolution and aggregated to weekly medians. Over the entire period the agreement between TGS-derived and reference CH4 mole fractions measured by a high-precision Los Gatos Research instrument was R2=0.42 , with better results during summer ( R2=0.65 in summer 2012). Using absolute instead of relative humidity for the correction of the TGS 2600 Sensor signals reduced the typical deviation from the reference to less than ±0.1 µmol mol−1 over the full range of temperatures from −41 to 27 ∘C . At weekly resolution the two Sensors showed a downward drift of signal voltages indicating that after 10–13 years a TGS 2600 may have reached its end of life. While the true trend in CH4 mole fractions measured by the high-quality reference instrument was 10.1 nmol mol - 1 yr - 1 (2012–2018), part of the downward trend in Sensor signal (ca. 40 %–60 %) may be due to the increase in CH4 mole fraction because the Sensor voltage decreases with increasing CH4 mole fraction. Weekly median diel cycles tend to agree surprisingly well between the TGS 2600 and reference measurements during the snow-free season, but in winter the agreement is lower. We suggest developing separate functions for deducing CH4 mole fractions from TGS 2600 measurements under cold and warm conditions. We conclude that the TGS 2600 Sensor can provide data of research-grade quality if it is adequately calibrated and placed in a suitable environment where cross-sensitivities to gases other than CH4 are of no concern.