Flow Transmitter

It can not be helped, schematic diagram is too small to read.

Agreed.

Gravity.

Gravitation - Wikipedia, the free encyclopedia

It pulls you, and liquids, "down".

Both transmitters are looking at differential pressure (pressure drop across the measuring sensor).

The upside measurement is steam in a gaseous form which per the system design suffers minimum condensation in the sensing lines and therefore does not require a condensate port.

The bottom side measurement is taken at the low point of the system where maximum condensation occurs so it must have a condensate port.

Hope this helps.

This is some sort of ΔPressure flow meter with a standard orifice in the middle I should say, his diagram is quite small still(I'm too lazy to see). Other side(low pressure side-after the orifice) needs to have condensate drain if High Pressure side is saturated vapor state. By PVT property diagram lowering the pressure will end up the state at Low Pressure under the saturated water region, some steam will condensate by converting pressure to high velocity at the edge of the orifice.

But this is a little bit classic set up. We have one ΔP transmitter set-up (w/ LP+HP ports already) available on the market.