Burebista8244
1092
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How do you read this manometer? why is there a line separating a T (in red) and a P (in green)? Can anyone help me? it says x100=Pa (which is pascals), but also mili bars above (mbars)?
Thanks in advance
dobroweigh
I think there are several wrong answers here. The scales are logarithmic. So the reading is 3*10^0 mbar = 3 mbar, 0.003 Atm. Or 300 Pa (1 Bar = 100000 Pa).
ahorseelbowdeepinme
Those are some large man readings.
ufoara
just looks like the T and P are for scale. right to left on the T Red positive pressure above atmosphere to Negative/vacuum the P scale overlaps the T and than allow a much more precise measurement of vacuum
Icanhearwhatyouresayingandtheanswerisno
3.5 P? Not great, not terrible
Burebista8244
Oh my God guys, thank you so much everyone for your answers!!! All of you helped me a lot. Have a wonderful night (or day depending where you are). God bless you all ^_^
velicitia
The mirror there in between the two scales is so you can account for viewing angle (parallax error) -- if you see the reflection of the needle, you're not reading straight on.
Looks like the two scales are to give you range a different range based on the "T" or "P" input selection, with a little bit of overlap (probably for when you send the needle to the extreme of one range)
Burebista8244
Thank you very much ^_^
RustyRedbeard
hushpuppyextraordinaire
I only know inch in water column
abraxasfury
So 1 millibar is equal to 100 pascal. So if the needle is pointing to 10^1, you have 10 millibar which is the same as 1000 pascals, which is the same as 1 kilopascal
Burebista8244
Thank you very much ^_^
Burebista8244
You know, it's like having a device that says on it that it measures energy in Joule, but in reality it measures energy in eV and you actually have to transform it in Joule. Does that make sense? What i want to be sure, the side below the mirror (the green one), are values in milimeters? And i have to transform them in Pascal? Thank you very much in advance
Burebista8244
So does that mean that what i read on the bottom side, the side below the mirror (so the green one), are values in milibar? And if i want the value in Pascal, i have to make the conversion as you did?
if so, it's kinda strange then, because other people said that the above side (above the mirror) the red one, are values for Torr (T) and the bottom side, the green one, are values in Pascal (P). If you read values in milibars, should there be a mbars instead of the green "P"?
abraxasfury
My best guess, based on nothing but this photo: using the switches, you can measure T1, T2, T2 -P, or P. If you're measure T1 or T2 you use the top scale and read it in mbar. If you're measure P, you use the bottom scale and read it in mbar. Based on what very little I know about manometers, I assume that P is the difference between T1 and T2. T1 and T2 refers to tube 1 and tube 2 maybe?
skipweasel
Do you mean the curved space with a mirror behind it? You align the needle with its reflection to remove parallax errors in reading it.
skipweasel
https://electronics.stackexchange.com/questions/588682/analog-scales-why-do-they-have-a-metallic-strip for a proper explanation.
Burebista8244
Thank you very much ^_^
xedrik
Units-wise, looks like the upper scale is for reading in Torr and the lower is in Pascal. Since there's a light for "T" and "P", you probably need to actuate one of the switches to change units. As others have said, the line is a mirror so you can read it dead-on. If you can see the needle in the mirror, you're viewing from the side and seeing an inaccurate result. Can always try documentation@leybold.com for help with a manual maybe.
Burebista8244
Thank you very much ^_^
Greatnewspeople
Looks like the torr value indicates a medium vacuum.
Sauce:https://solarmfg.com/wp-content/uploads/2016/02/Understanding-Vacuum-9.pdf
Burebista8244
Thank you very much ^_^