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Application Information – Pneumatic
NOTE: Pressure and temperature readings must be
taken at the flow transmitter inlet to ensure accurate
correction factors.
The pneumatic flow transmitter is calibrated for air in
standard cubic feet per minute (scfm) at 1.0 s.g. (70°F
@ 100 psi), and liters per second (lps) at 1.0 s.g.
(21°C @ 6.9 bar).
FLR Flow Transmitter
Installation & Programming Instructions
Page 16
Figure 10. System Schematic
Air 1.0 1.000 R R R R R R R R R
Argon (A) 1.38 1.175 R R R R R R R R R
Carbon Dioxide (CO
2
) 1.53 1.237 R R R R R R R R R
Freon 11 (CCI
3
F) 4.92 2.218 R R R R R R R R R
Freon 12 (CCI
2
F) 4.26 2.060 R R R R R R R R R
Helium (HE) 0.14 0.374 R R R R R R R R R
Hydrogen (H
2
) 0.07 0.265 R R R R R R R R R
Natural Gas 0.60 0.775 C C R C R N C R R
Nitrogen (N
2
) 0.97 0.985 C C R R R R C R R
Oxygen (O
2
) 1.10 1.049 R R R R R R R R R
Propane (C
3
H
8
) 1.57 1.253 R R R R R N N R R
Air / Gas
y
t
ivarG c
i
fi
c
e
p
S
munimulA
tSS 613T
tSS 303T
notiV
RPE
r
o
tcaF noitcerroC
elacS .
d
tS
s
s
arB
etanobracyloP
nolyN
™x
er
yP
R = Recommended
N = Not recommended
C = Consult Factory
FLOW RATE CORRECTION FACTORS FOR GAS
SCFM (Actual) =
SCFM (Indicated)
f x f x f
12
3
f
1
= conversion factor for inlet pressure
f
2
= conversion factor for temperature
f
3
= conversion factor for specific gravity
PRESSURE CORRECTION FACTOR
(f
1
)
Operating Pressure (psig)
psig 25 50 75 100 125 150 175 200 225 250
f
1
1.700 1.331 1.131 1.00 .902 .835 .778 .731 .692 .658
f
=
114.7
14.7+psig
1
TEMPERATURE CORRECTION FACTOR
(f
2
)
°F 10 30 50 70 90 110 130 150 170 190
f
2
.942 .962 .981 1.00 1.018 1.037 1.055 1.072 1.0901.107
f
2
=
460 +
°F
530
SPECIFIC GRAVITY CORRECTION FACTOR
(f
3
)
f = Specific Gravity
3
Table 4 - Correction Factors
Table 5 - Fluid Selection
Note: Table 4 is included to show the correction algorithms included in the program to perform pressure,
temperature, and specific gravity corrections. When configuring the FLR Flow Transmitter, enter the actual
operating pressure, temperature, and specific gravity values, not the correction factors.