Custom Design Tanks
Where the tank design does not match one of the eight common tank shapes, P-34
may be programmed for level versus volume characterization.
Characterization is achieved by entering the level and corresponding volume for the
elevations where there is a change in the tank profile. Where curves are involved, the
more breakpoints that are defined, the more accurate will be the volume measurement.
A maximum of eleven breakpoints can be defined.
Level data is entered in the linear units selected (P-1) and volume data is entered in the
desired volumetric units. Both of these are referenced to the bottom to the tank.
By setting P-34=9, the H-# and F-# co-ordinates, where:
H = level data
F = volume data
# = breakpoint 1 to 11
may be alternately accessed for the selected breakpoint by successively pressing .
Breakpoints are selected by entering the desired breakpoint number or by pressing
the or key. When the desired coordinate has been selected, the entry field
is accessed by pressing . and the level or volume is entered.
To end programming of H and F co-ordinates, press CLR while H-# or F-# is being
displayed.
Example 4a
The application is to measure the level of liquid in a custom design tank. The tank
manufacturer specifies the following level vs. volume data.
select:
P-1 enter option "1", units in metres
transducer
158.9 m
3
@ 6 m
58.42 m
3
@ 4 m
29.12 m
3
@ 3 m
4 m
3
@ 1 m
0 m
3
@ 0 m
ALT
DISP
↓
↑
∗
P-3
6.5 m
P-4
6 m
PL-399 6 – 19
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