How would you know how to calibrate them without a known-good reference
device ?
How would you know how much to calibrate for humidity anyway ?
FWIW, I've been using weewx to save my PurpleAir data for over 27 months of
data into a separeare db if you guys want a copy in order to do some
i have long thought my pair of ecowitt units read too high, but i have
no reference hereabouts to calibrate them.
does anyone know of a correction algorithm for them?
On 12/08/21 3:02 am, Alan Stankevitz wrote:
I have been attempting to make corrections to the Ecowitt unit cuz
it's much less
Thanks for the info. Regarding your slightly off-topic question, purpleair
and ecowitt use similar light-scattering detectors made by plantower. The
purpleair has two sensors that average out the readings and I believe are
doing some internal coding to rectify the humidity problem. The
in [[Corrections]] section of weewx.conf you can do something like
pm2_5 = 0.52*pm2_5 - 0.085*outHumidity + 5.71
slightly off-topic, does anyone know if the purpleair correction applies to
other sensors, or just the purpleair?
> On 11 Aug 2021, at 10:25 pm, Alan Stankevitz wrote:
>
> I am
Newbie here...
I am using the G1000 driver for Ecowitt sensors. Works fine but need to
apply a complex calculation to correct the pm2.5 sensor data.
The equation would be something like:
Cpm2.5 = (pm2.5/(1+((.25*RH)*(.25*RH))/(1-RH)))
RH = Relative Humidity
pm2.5 is raw pm2.5 data
Cpm2.5 is
