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About Oseania
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12-13-2019
02-10-2020
Oseania
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02-10-2020
11:44 AM
Hi, We have been testing Bosch BME680 baseline drift by reading the raw resistance output (without BSEC). We have been using heating cycle of 150 ms at 320 C and we perform this measuremetn every two seconds. We have noticed considerable baseline drift as can be seen from teh figure below, however the baseline drift seems to stabilize after a week or so (see below, measurement 300 000). There is a considerable linear drift up to measurement 250 000 and the periodic down-peaks are due to daytime when the lab is populated by people. Is this normal behaviour and related to MOX sensors in general, i.e. is there a "burn-in" time that we have to incorporate into our manufacturing and calibration cycle? We have tested with BSEC and obviously the raw values are the same. However the BSEC seems to provide compensated value (IAQ) which show quite flat trends. We assume that BSEC does some kind of baseline drift removal?
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01-20-2020
09:57 AM
I am returning to this as we have now more data on this issue. We have been testing Bosch BME680 on normal office settings with following cycle: 1. Heat to 400 C for 1 second 2. Drop the temperature for 150 C for 30 seconds We repeat this cycle continuously. It seems that BME680 will saturate after couple of days and lose its sensitivity totally. At first you get some changes in resistance when person stands close to the sensor but after a day or two the sensor will essentially break down. Is the cause for this the continuous heating? There is no mentioning of this in the spec sheet. According to it we assumed that the sensor could withstand prolonged heating at least on low temperature (150C).
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12-19-2019
01:02 PM
We tested with two other sensors which are not housed in plastic housing. These are working fine with the given heating. There is some adhesive in the enclosure and a very small venting hole which is basically plugged. I was starting to think following causes: our test set-up materials emit gases that somehow destroy the sensor (adhesives or plastics are containing forbidden chemicals) our test set-up runs out of gas (vacuum is formed) and thus making the ambient conditions impossible for the sensor to function properly
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12-16-2019
02:24 PM
Regarding the issue, we have found out that this is reproducible with several sensors. I was wondering if this is related to the long heating sequence (30 seconds) where the standard max by the software is 3s? Could this prolonged heating cause degradation in the metal-oxide layer of the gas sensor?
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12-13-2019
02:35 PM
Hi, We are testing BME680 in mobile application, where the sensor is heated and measured periodically (every 5 minutes). The heating is done to 400C. The heating and measurement time is 30s and this is repeated three times. We have noticed that the sensor starts to move towards saturation limit ( around 13007335). This means that after a while we are not able to perform the measurements. Is the heating time too much and does this cause degradation? Is heating-cooling cycle too much for the sensor?
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