TROUBLESHOOTING ST100 Series Flow Meter
38 Fluid Components International LLC
Verify Standard Versus Actual Process Conditions
The flow meter measures the mass flow rate. The mass flow rate is the mass of the gas flowing through a pipe per time. Other flow meters,
such as an orifice plate or a pitot tube, measure the volumetric flow rate. The volumetric flow rate is the volume of gas per time. If the read-
ings displayed do not agree with another instrument, some calculations may be necessary before comparing them. To calculate the mass
flow rate, the volumetric flow rate, pressure, and temperature at the point of measurement must be known. Use the following equation to
calculate the mass flow rate (Standard Volumetric Flow rate) for the other instrument:
Equation
Where:
Q
A
= Volumetric Flow
P
A
= Actual Pressure
P
S
= Standard Pressure
Q
S
= Standard Volumetric Flow
T
A
= Actual Temperature
T
S
= Standard Temperature
PSIA and °R are used for pressure and temperature units.
For Metric use bar(a) and °K are used for pressure and temperature.
Example:
Q
A
= Volumetric Flow = 1212.7 ACFM
P
A
= Actual Pressure = 19.7 PSIA
P
S
= Standard Pressure = 14.7 PSIA
Q
S
= Standard Volumetric Flow = 1485 SCFM
T
A
= Actual Temperature = 120°F (580°R)
T
S
= Standard Temperature = 70°F (530°R)
For Metric:
P
S
= Standard Pressure = 1.01325 bar(a)
T
S
= Standard Temperature = 21.1°C (294.1°K)
=1485 SCFM
( )
1212.7 ACFM
1
19.7 PSIA
580°R
530°R
14.7 PSIA
( () )
Q
S
= Q
A
×
[ ]
P
A
T
S
T
A
P
S
×
Check the Hardware
Equipment Required:
• Digital Multimeter (DMM)
• ST100 Configuration Application
• USB cable Standard Type A male connection on both ends.
• Two Decade Resistance Boxes with resolution from 0.01 to 9999.99 ohms
• Allen Wrench 1/16 inch
• Small size flat blade screwdriver (for sensor wiring connection)
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