Emerson Daniel 3415

B.1.1 Volumetric Flow Rate
Volumetric Flow Rate - U.S. Customary units Equation B-3:


3
/ℎ
= 
/
× 3600/ℎ ×

2

4
×
1
12
2
= 
/
× 
2
 ×
3600 × 
4 × 12
2

2
ℎ
2
= 
/
× 
2
 × 19.63495 
2
/ ℎ
2
where
Q
ft
3
/hr
volumetric flow rate (ft
3
/h) (QMeter)
V
ft/s
gas flow velocity (ft/s) (AvgFlow)
p
geometric constant, pi (dimensionless) (3.14159265...)
Volumetric Flow Rate - Metric Units Equation B-4:


3
/ℎ
= 
/
× 3600/ℎ ×

2

4
= 
/
× 
2

×
3600 × 
4
/ℎ
= 
/
× 
2

× 20827.433 /ℎ
where
Q
m
3
/hr
volumetric flow rate (m
3
/h) (QMeter)
V
m/s
gas flow velocity(m/s) (AvgFlow)
p
geometric constant, pi (dimensionless) (3.14159265...)
D
m
pipe inside diameter (m) (PipeDiam)
B.2 Chord "L" dimension calculation
The chord "L" dimension is calculated from the meter housing length as well as the
transducer pair lengths, mount lengths, holder lengths, and stalk lengths as shown in
Equation B-5. The transducer lengths are etched on the transducers. Likewise, the lengths
of the mounts, stalk assemblies, and transducer holders are also etched on the individual
components. The length of the meter body is found on the original calibration sheet
supplied with the meter.
Miscellaneous equations
130 3410 Series Gas Ultrasonic Flow meters