Why Boiler Drum level transmitter (TX) or level transmitter
rang always put -600 to 0 other -900 to 0. Mines range why
use….?
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Answer Posted / radha
this is called wet leg system,so you are telling range -600
to 0 means your drum distance between HP & LP 600 mm and HP
and LP legs both are filled with condensate(water)
continueosly but LP leg distance higher than the HP leg,so
LP side pressure will acting 600mmWC extra, compare with HP
leg pressure,so we have to eliminate that pressure LP
pressure 600mmWC
thats why -600mmWC = 4mA
0 mmWC = 20mA
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