Fuji Electric portaflow X, Быстрая справка

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24
ECNO: 622
7. Q & A
(2) Difference in sensor mounting length
As a general standard, when the error in mounting length is
±
1mm, the error of flow is within
1%.
(3) Flow in piping is deviated
When the straight piping is short (particularly upstream side), the flow has become skewed and
some deviation error will occur, or fluctuation of indicated value will occur when the flow is
swirling.
(4) Inside diameter different from set value due to deposits of scales inside the piping
The error is the same as noted in 1). If scales are badly deposited, receiving waves are not
available and measurement may be disabled.
(5) Change in water temperature
Temperature is compensated, but there is a slight error when temperature changes.
(6) Weak received wave due to improper mounting condition and piping condition
Measurement may be possible. But, if received wave is weak, it may result in a large error due
to the effect of external noise.
L
100
0
–1
1
400 500
[%]
300 mm
φ
+1mm
–1mm
200
Inside diameter
Flow error
(Setting of flow with water)
100
1.0
–1.0
–0.5
0.5
0
400 500 300 mm
φ
35
°
C
0
°
C
70
°
C
20
°
C
200
Flow error
Inside diameter
[%]