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Post by chrisf4lc0n on Jan 16, 2016 3:02:42 GMT -5
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Post by chrisf4lc0n on Jan 16, 2016 4:15:19 GMT -5
I think I have got it:
PPM=(9.71/((Rs/Ro)^2.5))-8.498
Rs=x*(0.024+0.0072*findVal("Relative Humidity")+0.0246*findval("Temperature"))
I cannot figure the Ro out...
That equation would be good just for the CO, still trying to find something for the other gases.
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Post by chrisf4lc0n on Jan 16, 2016 4:21:55 GMT -5
After doing some more research I have bumped into an info that For TGS 2600, Ro is in the range of 32.8- 39.6 kΩ, should I just take the middle value and hope the best?
Here is my function which I have implemented into the support.cfg:
func_Air_Quality = (9.71/((x*(0.024+0.0072*findVal("Relative Humidity")+0.0246*findval("Temperature"))/36200)^2.5))-8.498,pseudo-ppm
Once the sensor arrives and I will be able to check the data I will report back...
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haydnw
Junior Member
Posts: 95 
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Post by haydnw on Jan 17, 2016 14:10:05 GMT -5
The function in your last post looks like it is syntactically correct, however...
The only way to convert to a reliable ppm value is to calibrate your sensor using known concentrations of the target gas. The values given on the page you linked to will only be applicable to that individual sensor. The strength of these sensors is their low price; that comes at a cost, and the cost is that they are very variable so you cannot just transfer functions between sensors, even if they are the same model out of the same factory.
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Post by chrisf4lc0n on Jan 17, 2016 17:54:09 GMT -5
haydnwI more than understand that... I will try to cross reference the readings with some semi-professional CO sensor that way I will be able to determine the Ro and calibrate the TGS 2600 properly. Thanks for all your help and input.
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haydnw
Junior Member
Posts: 95
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Post by haydnw on Jan 21, 2016 15:59:24 GMT -5
Cool. Sorry if I'm going on about it, but so many people just assume that you can get highly-accurate readings of environmental levels, which is frustrating when the sensors are neither consistent in their readings nor sensitive enough to detect normal environmental levels of some things.
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Post by chrisf4lc0n on Jan 21, 2016 16:20:57 GMT -5
No problem mate! Unfortunately any of the func_Air_Quality calibrations do not seem to be working, they simply crash the app... I will look into that and try to get to the bottom of it.
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