55
9900 Transmitter
Technical Reference for
Level, Volume, and Mass Measurement
The 9900 can automatically perform
level, volume and mass calculations:
●
Pressure-to-level
●
Mass
●
Volume
Pressure to level conversion:
Level = P ÷ (SG × D)
where P = Pressure
SG
=
Speci
fi
c Gravity of
fl
uid
D = 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 × SG × V
where m = mass of
fl
uid
D = density of water = 1000 kg/m
3
SG
=
Speci
fi
c Gravity of
fl
uid
V = Volume of
fl
uid (m
3
)
m (kg) = 1000
×
SG
×
V
r
h
Length
A
Volume Calculations
Vertical cylinder:
V =
π
× r
2
× h
where r = radius 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
where
r = radius of vessel
h = height of segment
(
)
⎥
⎦
⎤
⎢
⎣
⎡
−
×
⎟⎟⎠
⎞
⎜⎜⎝
⎛
−
−
⎟
⎠
⎞
⎜
⎝
⎛
−
×
×
=
−
2
cos
1
2
h
rh
h
r
r
h
r
r
A
2
Custom Measurements
