VOC accuracy and ppb to ug/m3 conversion

[mazenjamal]

Hi,

We are using the Bosch BME 680, and we state that the measurement range is 0.10,000 ppb (no accuracy stated)

The below chart is the WELL Building Standard requirement.
We get asked on an almost daily basis if we meet the WELL requirement and we have no answer. Also, get asked for accuracy and can't answer that

Converting 1ppb = 4.57 ug/m3 would fail almost every project. 

1- what is the conversion rate from ppb to ug/m3 given the mixture stated in Table 5 of the bosch manual?

2- Given the production tolerance and certified accuracy in Table 5, can we deduce an accuracy range?

Would highly appreciate help on this

[BSTRobin · Accepted solution]

Hi mazenjamal,

There is no information from datasheet indicating that measurement range is 0.1 ppb.
The Table5 represents the most important compounds in an exhaled breath of healthy humans, tested with 0.5-15 ppm of b-VOC at 20°C and 50% r.H..
Due to the gas proportion of VOC is changeable, there is not a certain accuracy.

[mazenjamal]

Hello Robin,

Thanks for getting back to me 

Could you explain the ( tested with 0.5-15 ppm ) 

Given my attached image in the previous message and highlighted in Yellow. Do we meet those requirement with this sensor?

[BSTRobin]

Hi mazenjamal,

This range(0.5-15ppm) is our testing range, which means the production would show the better performance at that range.