ABB 266 HART Series, Operating Instruction

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2600T Series Pressure transmitters | OI/266/HART-EN Rev. D 25
Liquid Level Measurements on closed tanks and
non condensable fluids (dry leg)
– Mount the transmitter at the same height or below the lowest
level to be measured.
– Connect the + (H) side of the transmitter to the bottom of the
tank.
– Connect the - (L) side of the transmitter to the upper part of
the tank, above the maximum level of the tank.
Liquid Level measurement with closed tanks and
condensable fluids (wet leg)
– Mount the transmitter at the same height or below the lowest
level to be measured.
– Connect the + (H) side of the transmitter to the bottom of the
tank.
– Connect the - (L) side of the transmitter to the upper part of
the tank.
– Fill the vertical section of the connecting line to the upper
part of the tank with a compatible liquid through the dedicated
filling tee.
Figure 28: Level measurement on closed tank with dry leg
Figure 29: Level measurement on closed tank with wet leg