Ceraphant PTP31B

First thing when selecting a pressure switch is knowing the expected pressure range that it will work on, after that, you should consider if you need to measure absolute pressure or relative pressure, both can work for vacuum applications but the absolute pressure will measure from 0 bar abs and won't compensate ambient pressure changes. Relative pressure sensors will measure from -1 bar g and beyond and will compensate for ambient pressure changes. The best place for installing it will depend from case to case, but typically, you will want to avoid places where condensation can accumulate over the measuring sensor. In the Technical Information document, you can find the manufacturer installation recommendations.