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About wtc-peg
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02-22-2019
02-14-2022
wtc-peg
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12-23-2021
07:10 PM
Hello, We are user of BME680 for 3 years, using essentially IAQ index and this is OK for the use cases we had until now.. Form last two years request for a tVOC value in ug/m3 has been more and more frequent. Even if I had a look at previous post about this subject on the forum, I'm not sure to understand if it is possible to get a kind of tVOC indoor measurement that could be coherent for all Mox sensor manufacturers. First, could you give your opinion on this subject eventually argumented with reference to standard (Like talking about standard VOCmixture to calibrate MOX sensors for indoor air quality analysis or other document that could talk about standard or common "way of doing" ...) Second, do you think we could be able to get a "kind of standard tVOC" level from the BME680 at the moment ? Last would it be possible with its recent evolution, the BME688 ? In advance many thanks
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04-30-2020
04:50 PM
Hello, So what i can conclude is that : IAQ is coerced between 25 and 250 and will never show values between 250 and 500. Then I'll never be able to distinguish between people presence in a room and people presence + important VOC exceptionnal polution. Is that correct ? Then, you say that I should use Static-IAQ if my sensor is indoor and static. Then: What will be the range/values of returned s-IAQ values ? Will it be 0 to 500 ? Could I find a kind of "application note " about s-IAQ measurement and interpretation in Static Indoor environment, and furthermore using ULP mode ? In advance thanks
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04-09-2020
08:57 AM
But if IAQ is automatically "coerced" between 25 and 250 how can we detect presence of nocive gazes in a room (paints or other ?) ? Here is some more data. I can't have output of raw data easily as sensor is already embeded, and i have to make new firmware for it. But here is the behavior of sensor "Outside for 3 days" for IAQ. It seems really T/H dependant as what we can expect form output fresh air is only a very few increase of CO2 by night... BUT notice that sensor as begun its ULP life in indoor environment (as show in the original post)... Should I reset the periodically recorded calibration data ?
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04-07-2020
10:12 AM
Hello, I come back, as I could make some moretests with the same sensor still in ULP mode. I took it outside (on a window) for two days, quite far from center of town near Toulon in France ;O). Measurements ar shown below, but here are my questions: 1) Could you advice me for a domestic product that I could put close from the sensor (ie: somes tens of cm below) to get IAQ higher than 300, fror about 3 or 4 hours ? I tried with smelty polyester resins (expecting for "embeded styren" to act), but I never get more than 200 or 250 IAQ and even it was decreasing after some hours and my resin was still very smelty... 2) On the curves below the sensor is outside fro 2 days, during last night humidity climbed a little and then the IAQ climbed up to 250 without any apparent reason (outside). In the morning even if humidity decreases the IAQ stays at th same level. Do you have any idea of what I could do wrong ?
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03-03-2020
01:04 PM
Hello, I’m running BME680 in ULP mode, using BSEC library on stm32, on two different sensors, could someone help me to explain behaviors ? The two sensors are at the same place in a room. You can see joined pictures of measurements (T,H,VOC,CO2), for 24hours in an office with nobody inside. Both sensors were running for 3 days before this day of measurements. The global sensor is also equipped with a CO2 NDIR sensor, that show a quit stable CO2 level all along these 24hours. At the end of period, for both sensors, you can see arrival of 3 people in the office (CO2 increasing and VOC also). First of all, it is nice to see that the morphologies of the curves are similar. But my mains questions are: Why Both sensors get such an increase of VOC for about 0-4 degrees of temperature increase (around 15h00)... in the worst case (250), and according to bosh IAQ table interpretation, it says to me that air is very very polluted (but nobody inside no, paints or anything like this !!??). Why is this value so big ? Why the top of measurement of two BME680 sensors are so different one from each other : Max IAQ at 250 or 140 around 15h00 ? VOC seems "to much" tied to temperature measurement even using BSEC that should already compensate. Anyway to improve that ? Please help to interpret these results.
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