Vacuum Sensor Advice Needed

Other Hardware Sensors
1

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

2

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?

3

Hi Stefan,

Thank you for your reply.

Gauge
Gauge1536×2040 196 KB

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)

4

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