Hi,
I am looking for help regarding sourcing a sensor to read up to -25 InHg of vacuum. Can anyone recommend such a sensor, and what else am I likely to need?
Thanks in advance
a pressure that is -25 lnHg below vaccuum?
The minimal pressure is +0.00000000000 lnch-Hg but no negative values.
Do you mean a high-tech vacuum of +25 Inch-Hg which would equal to 84659,7 Pa
which is equal 0,847 bar
which would mean a pressure that is 1 bar - 0,847 bar = 0.153 bar below normal atmospheric pressure?
Hi Stefan,
Thank you for your reply.
The gauge is attached to an industrial vacuum pump. If the valve is closed the gauge looks as it does in the photo, ie 0 InHg. Then the valve is open and the vacuum is drawing against an object, it measures around -20 InHg (-0.7 Bar)
what does it mean if the valve is closed. In case of the closed valve:
does the gauge do have connection to the vacuum-pump
or
does the gauge not have connection to the vacuum-pump?
in case of a closed valve?
If the pin of this gauge is at 0.00 bar = 0.00 inHg this means there is no pressure difference between environment and whatever the gauge is connected to.
If the pin of this gauge is at -20 InHg (= -0.7 bar) the meaning is the absolute pressure inside is +0,3 bar which is 0,7 bar below the absolute pressure of the environment which has 1.0 bar absolute pressure.
So this means you are searching for a pressure sensor that can measure a differential pressure in the range of -0,8 bar to + 0.8 bar
minus 100 kPa means absolute vacuum. 1 bar below 1 bar environmental pressure
best regards Stefan
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