Pressure sensor not reporting right value

[General_Witt]

@Dimitrios-Kanellopoulos
Of course. 3 different government ones. In one case I hiked till I was literally 1 meter away from the sensors. Still 8-9 hPa difference.

[Dimitrios Kanellopoulos]

@General_Witt very strange. WTF. Did you get the new unit back ?

[sartoric]

@General_Witt
Was the altitude correct?

[zzmike76]

@General_Witt @sartoric the altitude is correct in the watch (372 meters), but pressure always differs by at least 20/30 hPa, i guess the sensor has some issues

[Dimitrios Kanellopoulos]

Hey @zzmike76 may I know the location and the pressure raspi and S9 reports. I can check online for you

[Dimitrios Kanellopoulos]

@zzmike76 30hpa is a completly defective device. I do insist that one is looking at a different value.

[mario_b]

@zzmike76 on the ambit3 you can go into a service menu, to show the absolut pressure. (Maybe you can check that too on the S9)
When I got the watch, it was absolut perfect calibrated. When I first time did a hike, with Baro Mode altitude, the sea level pressure difference was exactly the difference of the weather change in this time of the hike. But the absolut pressure is spot on.

[General_Witt]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

@General_Witt very strange. WTF. Did you get the new unit back ?

I’m still in “received” status. They got the watch wednesday, I’m waiting for some response these days.
Anyway I tried both manual and auto altitude calibration with no avail.

[Dimitrios Kanellopoulos]

@General_Witt asking for you the CC

[zzmike76]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

the pressure raspi and S9 reports. I can check online for you

location is Würenlingen (Switzerland), raspi reports 975 hPa while watch 1019

[General_Witt]

@Dimitrios-Kanellopoulos said in Pressure sensor not reporting right value:

@General_Witt asking for you the CC

I’m sorry Dimitrios, I don’t know what CC is.

[Dimitrios Kanellopoulos]

@zzmike76 975 is too low for sea level pressure

[Dimitrios Kanellopoulos]

@General_Witt please pm me your email address to check the status of your case

[Dimitrios Kanellopoulos]

@zzmike76

So for your place here is the current day value and prediction of SEALEVEL pressure not absolute pressure.

[Dimitrios Kanellopoulos]

Which validates what I am talking about

[mario_b]

@zzmike76 here you can see ambient pressure (stations niveau) and sea level pressure. https://www.bergfex.ch/aargau/wetter/stationen/wuerenlingen--psi/

[Dimitrios Kanellopoulos]

@mario_b which also shows the diff :

As @zzmike76 reported.

And

I think this will help a lot @zzmike76

[mario_b]

@zzmike76 on a raspberry you get the pure pressure reading of the sensor. like @Dimitrios-Kanellopoulos wrote. if you want the sea level pressure you have to write a script which calculates the ambient pressure (station niveau) to the actual elevation and temperature. you need a temperature sensor value too, or input the temperature and elevation manually. but don’t take the pressure sensor on the raspberry as 100% trusted. i got two of them which are a little bit of.

[zzmike76]

@mario_b @Dimitrios-Kanellopoulos thanks a lot for the clarifications !! at least I understood the differences now

[Dimitrios Kanellopoulos]

@zzmike76 no problem. I was confused at start as well.