First I will list the proof/recommendation I found in vendor literature and also during one of the projects this was vendor recommendation for full vacuum condition. ContentsRemote Diaphragm Seal Transmitter# REASON 1 (BOILING POINT DECREASES WITH DECREASE IN PRESSURE)# Reason 2 (TO MAINTAIN POSITIVE PRESSURE AT TRANSMITTER SIDE)# Reason 3 (BUBBLES TEND TO EXPAND SIGNIFICANTLY … Continue reading Remote Diaphragm Seal Transmitter for Vacuum Application