42
Signet 8900 Multi-Parameter
Custom point #10
3000 gal.
Custom point #1
0 gal.
Custom point #2
45 gal.
Custom point #3
118 gal.
Custom point #4
Custom point #5
250 gal.
Custom point #9
1300 gal.
Custom point #6
380 gal.
Custom point #7
700 gal.
Custom point #8
1000 gal.
160 gal.
Level and Volume conversion in custom shaped vessels
If you select Custom Shape in the Options menu, you can defi ne
from 2 to 20 Custom Points to establish the relationship of level to
volume in the vessel.
•
Select Manual level Measurement mode to edit both level and
volume data (dry confi guration).
•
Select Automatic level Measurement mode to accept the
sensor measurement of the Level, while you assign a
volumetric value to each custom point (wet confi guration).
•
Enter from 2 to 20 custom points to link level and volume
values.
• The
fi rst custom point must be the lowest fl uid level in the
vessel.
•
Each successive point must be greater than the preceding
point.
•
The last point must be equal to or greater than the highest
fl uid level in the vessel.
•
A custom point should be located at all transition points in
the vessel shape (for example, at custom point #9, where the
shape changes from a cylinder to a cone).
•
The more complex sections should be defi ned with more
points. Notice that the conical section of the illustration has
been defi ned by custom points 1 through 9.
•
Simpler sections require fewer defi ning points. Note that the
cylinder requires only custom points 9 and 10.
Level, volume and mass calculations performed by the 8900
include:
Pressure to level conversion:
Level = P ÷ (SG • D
(water)
)
where
P = Pressure
SG = Specifi c Gravity of fl uid
D
(water)
= Density of water
With pressure in psi:
Level (meters) = (0.703069 • P / SG)
with pressure in bar:
Level (meters) = 1.019715 • P / SG)
Mass conversion
m = D
(water)
• SG • V
where
m
= mass of fl uid
D
(water)
= Density of water = 1000 kg/m
3
SG
= Specifi c Gravity of fl uid
V
= Volume of fl uid (m
3
)
m (kg) = 1000 • SG • V
r
h
Length
A
Technical Reference for Level measurement
Volume calculations
Vertical cylinder:
V = • d
2
• h/4
where
d = diameter of cylinder
h = height of fl uid
Rectangular vessel:
V = w • l • h
where
w
=
width
l
=
length
h
=
height
Horizontal cylinder:
V = A • L
where
A = area of segment
L = Length of vessel
r = radius of vessel
h = height of segment
Custom vessel:
The 8900 performs linear interpolation between adjacent points.
Содержание 8900
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