Boiler Drum Level DP Transmitter

[jn12]

Why is it that they put the low leg of transmitter at the top of the drum, and the high leg of transmitter at the bottom of the drum.

 

[xnuke]

The high leg senses the drum pressure plus the weight of the column of water above it; the low leg senses only the drum pressure.

xnuke
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[Compositepro]

The "high" port on the pressure sensor means high pressure, not high elevation. The higher pressure is at the bottom of the drum.