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°
Application n
2 : Liquid Level
°
Application n
3 : Liquid Level
Max level
Minimum
Minimum level must be at
or above this datum
. . . ADDENDUM FOR FLANGE-MOUNTED TRANSMITTERS
-
Closed Tank Using a Flange-Mounted Transmitter mod. 621ES
(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 mod. 621ES and a Wet Leg
(With Condensable Vapors)
level
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
e.g.mod. 621ES
Transmitter datum
Filling tee
e.g.
mod. 621ES
Transmitter datum
Impulse lines filled
with stable liquid
- 41 -
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