FLR Flow Transmitter Installation & Programming Instructions
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).
Figure 10. System Schematic
Table 4 - Correction Factors
FLOW RATE CORRECTION FACTORS FOR GAS
SCFM (Actual) = | SCFM (Indicated) f1 | = conversion | factor | for inlet pressure | |||||||
| f1 x f2 x f3 |
| f2 = conversion factor for temperature | ||||||||
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| f3 = conversion factor for specific gravity | ||||||
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| PRESSURE CORRECTION FACTOR (f1) |
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| Operating Pressure (psig) |
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psig | 25 | 50 | 75 | 100 | 125 | 150 | 175 | 200 | 225 | 250 | |
f1 | 1.700 | 1.331 | 1.131 | 1.00 | .902 | .835 | .778 | .731 | .692 | .658 | |
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| f1 = |
| 114.7 |
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| 14.7+psig |
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| TEMPERATURE CORRECTION FACTOR (f2) |
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°F | 10 | 30 | 50 | 70 | 90 | 110 |
| 130 | 150 | 170 190 | |
f2 | .942 | .962 | .981 | 1.00 | 1.018 | 1.037 | 1.055 | 1.072 | 1.090 1.107 | ||
Table 5 - Fluid Selection
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| Specific Gravity | Correction Factor Std. Scale | Aluminum | Brass | T316 SSt | T303 SSt | Viton | EPR | Polycarbonate | Nylon | Pyrex™ |
| Air / Gas | |||||||||||
| 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 |
| CarbonDioxide(CO2) | 1.53 | 1.237 | R | R | R | R | R | R | R | R | R |
| Freon 11 (CCI3F) | 4.92 | 2.218 | R | R | R | R | R | R | R | R | R |
| Freon 12 (CCI2F) | 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 (H2) | 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 (N2) | 0.97 | 0.985 | C | C | R | R | R | R | C | R | R |
| Oxygen (O2) | 1.10 | 1.049 | R | R | R | R | R | R | R | R | R |
| Propane (C3H8) | 1.57 | 1.253 | R | R | R | R | R | N | N | R | R |
f 2 =
460 + °F
530
R = Recommended
N = Not recommended C = Consult Factory
SPECIFIC GRAVITY CORRECTION FACTOR (f3)
f3 = Specific Gravity
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.
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