At 100 m
3
/h (normal), the accuracy is 4.6 % RD.
The calculation for the flow rate of 150 m
3
/h (normal) is performed similarly.
Re = 49517 (velocity = 1.2 m/s).
Since the Reynolds number is more than 35000, the volumetric flow rate accuracy is
±2 % RD.
●
Specifying volumetric flow rate accuracy (page 22)
Volumetric flow rate accuracy = 2 % RD
Temperature accuracy = 2 % RD
Pressure accuracy = 1 (MPa) × 1 (%FS)/100/(fluid pressure (MPa) + 0.1013 (MPa))
= 0.01/(0.7+0.1013) = 1.2 % RD
Based on these conditions,
The accuracy after temperature correction = (2 %)
2
+ (2 %)
2
+ (1.2 %)
2
= 3.1 %RD
At 150 m
3
/h (normal), the accuracy is 3.1 % RD.
●
Specifying volumetric flow rate accuracy
The volumetric flow rate accuracy is specified as follows:
•
MVF50 (pipe size 50A)
•
±Qmin (minimum measurable flow rate) when velocity is 0.5 m/s or less, or the
Reynolds number is 15000 or less.
4 % RD when velocity is 0.5 m/s or more, and the Reynolds number is from
15000 to 35000.
2 % RD when the Reynolds number is 35000 or more.
•
MVF80 (pipe size 80A)
•
±Qmin (minimum measurable flow rate) when velocity is 0.5 m/s or less, or the
Reynolds number is 10000 or less.
4% RD when velocity is 0.5 m/s or more, and the Reynolds number is from
10000 to 35000.
2% RD when the Reynolds number is 35000 or more.
•
MVF100 (pipe size 100A)
•
±Qmin (minimum measurable flow rate) when velocity is 0.5 m/s or less, or the
Reynolds number is 10000 or less.
4 % RD when velocity is 0.5 m/s or more, and the Reynolds number is from
10000 to 40000.
2 % RD when the Reynolds number is 40000 or more.
•
MVF150 (pipe size 150A)
•
±Qmin (minimum measurable flow rate) when velocity is 0.5 m/s or less, or the
Reynolds number is 10000 or less.
4 % RD when velocity is 0.5 m/s or more, and the Reynolds number is from
10000 to 50000.
2 % RD when the Reynolds number is 50000 or more.
22
Chapter 5. SPECIFICATIONS
