Liquid lines : On liquid lines the transmitter is mounted below the orifice plate because liquids have a property of self draining.
Gas Service : On gas service the transmitter is mounted above the orifice plate because Gases have a property of self venting and secondly condensate formation.
Steam Service : On steam service the transmitter is mounted below the orifice plate with condensate pots. The pots should be at the same level.
