ABB 268D/V Operating Instruction page 43

°
Application n 2 : Liquid Level
°
Application n 3 : Liquid Level
Max level
Minimum
level
Minimum level must be at
or above this datum
. . . ADDENDUM FOR FLANGE-MOUNTED TRANSMITTERS
- Closed Tank Using a Flange-Mounted Transmitter
(No Condensable Vapors)
Max level
Minimum
level
Minimum level must not
be below this datum
Span = H1*G1, in inches w.g. if H1 is in inches
G1 = specific gravity of the process liquid
Lower range value = [H2*G1], in inches w.g. if H2 is in inches
Upper range value = Lower range value + span
- Closed Tank Using a Flange-Mounted Transmitter and a Wet Leg
(With Condensable Vapors)
Span = H1*G1, in inches w.g. if H1 is in inches
Lower range value = [H2*G1]-[H4*Gw], in inches w.g. if H2 and H4 are in inches
Upper range value = Lower range value + span
G1 = specific gravity of process liquid
Gw = specific gravity of liquid in wet leg
Transmitter datum
Filling tee
Transmitter datum
Impulse lines filled
with stable liquid
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