Yokogawa digitalYEWFLO (DY) - Manual (Page 125)

<13. GENERAL SPECIFICATIONS>
13-15
IM 01F06A00-01EN
 Calculation formula
■ How to calculate volume fl ow rate at operating
conditions.
• Q
f
= 3600× ×S or Q
f
= ×D
2
354
■ How to calculate the velocity of a Reynolds
number.
• = 5× / D (Reynolds number of 5000)
• = 20× / D (Reynolds number of 20000)
• = 40× / D (Reynolds number of 40000)
where
• Re =
354×10 3 ×Q
f
×D
········· (1)
•  =


f
×10 3 ················ (2)
Q
f
: Volume fl ow rate at operating conditions
(m 3 /h)
D: Inner diameter of digitalYEWFLO (mm)
S: Sectional area of digitalYEWFLO (m
2 )
: Flow velocity (m/s)
Re: Reynolds number (non unit)

f
: Density at operating conditions (kg/m 3 )
: Viscosity at operating conditions (mPa·s (cP) )
:
Kinematic viscosity at operating conditions
(10
-6 m 2 /s (cSt) )
 Typical fl uid example
Table 13.8 Range of Measurable Water Flow Rate
(At standard condition of 15°C, ρ = 1000 kg/m 3 )
Model Code
Measurable Flow Rate
in m 3 /h
Range of Fixed
Accuracy Flow Rate
in m 3 /h
DY015 DY025/R1 DY040/R2 0.30 to 6 0.94 to 6
DY025 DY040/R1 DY050/R2 0.65 to 18 1.7 to 18
DY040 DY050/R1 DY080/R2 1.3 to 44 2.6 to 44
DY050 DY080/R1 DY100/R2 2.2 to 73 3.3 to 73
DY080 DY100/R1 DY150/R2 4.3 to 142 4.6 to 142
DY100 DY150/R1 DY200/R2 7.5 to 248 7.5 to 248
DY150 DY200/R1 — 17 to 544 18 to 544
DY200 — — 34 to 973 34 to 973
DY250 — — 60 to 1506 60 to 1506
DY300 — — 86 to 2156 86 to 2156
DY400 — — 177 to 3547 177 to 3547