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固原气体流量计计算公式kytola
作者： 发布时间：2026-08-05 11:08:59点击：1154
Actual flow rate
Q0 = Actual flow rate
ρ0 = Specific gravity of measured gas (Air = 1)
p0 = Actual ABSOLUTE pressure in metering tube
T0 = Actual ABSOLUTE temperature
(Kelvin) in metering tube
(0°C = 273,15°K)
(20° C = 293,15°K)
Flowmeter design (calibration) conditions
Q1 = Flow meter reading
ρ1 = Specific gravity of design gas (Air = 1)
p1 = ABSOLUTE design pressure
(calibration pressure)
T1 = ABSOLUTE design temperature
(Calibration temperature)
Example 1
What is the maximum flow if flow meter EK-3NR is used for carbon dioxide at 3 bar(g) / 25°C.
Ex-3NR scale is
1 – 12 NL/min air at 0 bar(g)/20°C
Q1 = 12 NL/min
ρ1 = 1
p1 = (0+1,013) bar = 1,013 bar
T1 = 293,15°K
Q0 = ?
ρ0 = 1,529
p0 = (3+1,013) bar = 4,013 bar
T0 = 298,15°K
Actual flow at 12 NL/min reading
Q0 = 19,15 NL/min CO2 at 3 bar(g)/ 25°C
Example 2
Flow meter LH-JJ32 is calibrated for 30 NL/min nitrogen at 3 bar(g)/ 20°C
What is the actual flow if flow meter LH-JJ32 is used for helium at 5 bar(g) / 10°C.
Q1 = 30 NL/min
ρ1 = 0,9672
p1 = (3+1,013) bar = 4,013 bar
T1 = 293,15°K
Q0 = ?
ρ0 = 0,1380
p0 = (5+1,013) bar = 6,013 bar
T0= 283,15°K
Actual flow at 30 NL/min reading
Q0 = 98,9 NL/min He at 5 bar(g)/ 10°C
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