Independent investigation of IDT MOXgas sensors compliancewith the UBA's IAQ study Scientific Report
●Subject:Independent investigation of IDT MOX gas sensors compliance with the UBA’s IAQ study
●Several metal oxide gas sensor modules (MOX-GS) have been investigated in parallel for Indoor Air Quality (IAQ) monitoring based on a study by the Umweltbundesamt (UBA), Germany’s federal environmental agency. Six ZMOD4410 MOX-GS from Integrated Device Technology (IDT Inc.) were characterized in gaseous mixtures of volatile organic compounds (VOC) as described by the UBA and the U.S. Environmental Protection Agency (EPA). These mixtures were diluted in moisturized synthetic air. Additionally all sensor responses were measured in mixtures containing ethanol, carbon monoxide (CO) and nitrogen dioxide (NO2). Sensitivity and response time were tested in a newly erected setup with precise control of surrounding temperature (± 0.5°C) and water vapor pressure (± 20 Pa). The tested total volatile organic compounds (TVOC) gas concentrations were adjusted according to UBA recommendations, which required the single components of the VOC mixture to be applied in the same mass ratios, as specified by the UBA’s Guideline Value II (GVII). The results clearly demonstrate that the sensitivities of the characterized sensors to the investigated components and mixtures differ considerably. Some ZMOD4410 sensors show elevated sensitivities to all investigated components and mixtures below the maximum workplace concentration (MAK) value – and even below GVII in NO2- or CO-containing mixtures.
The results prove that ZMOD4410 sensors are very well suited for qualitative and quantitative IAQ monitoring according to the UBA study, if humidity and temperature conditions are considered correctly.
●KSI
■The Kurt-Schwabe-Institut für Mess- und Sensortechnik (KSI) is a government-supported non-profit research institution that is developing new sensor techniques in the following areas:
▲Biological and physical sensors (DNA and protein chips, single molecule detection, measurement with complete cells, impedimetric and optical sensors)
▲Electrochemical sensors (miniaturized thick film sensors, ion selective electrodes and electrochemical detection methods)
▲Solid electrolyte gas sensors (Electrode and electrolyte materials, detection methods, sensor design, manufacturing technologies)
■The KSI has a broad variety of important tools, technologies and equipment for synthesis, manufacturing and characterization of materials, thin and thick films, biological structures and sensors. Some examples are devices for specific surface (BET) measurement, for material and layer characterization (XRD, SEM, EDX, XPS, μRFA, DTA/TG) and printing technologies (screen printing and pulsed laser deposition).
KSI’s equipment for gas sensor characterization comprise setups for providing highly accurate gas mixtures, gas analysis by GC/MS, MS, FTIR and humidity measurement as well as a special oxygen titration setup for material testing in gases with defined oxygen partial pressure. Methods to quantify gas sensors in a broad range of ambient pressures and temperatures are also available.
The first investigation of sensitivity, selectivity, long-term stability and cross sensitivities of MOX-GS was conducted with sensors from IDT and was carried out between September 25th and October 10th, 2017. A second equally extensive investigation of IDT MOX-GS was later conducted. The main goal of this second investigation was the characterisation of sensitivity in multicomponent VOC mixtures as described by the UBA and EPA (see next section). Additionally the sensor responses to CO and NO2 were measured by KSI. The MOX-GS from IDT were compared based on their resistance values (raw data).
●UBA study for Indoor Air Quality
■The UBA has carried out investigations and studies of indoor air and the TVOC for years and released a highly influential study [1] in 2007 summarizing the findings of 48 research papers and reports on IAQ. The study’s TVOC references for IAQ are particularly useful because they identify levels of potential hazards and provide recommended actions based on these TVOC levels.
Similar to the UBA guideline values, the U.S. EPA also provided Acute Exposure Guideline Levels (AEGLs) for airborne chemicals.
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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20 August 2018 |
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2.6 MB |
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