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An estimate of the error introduced into the indicated flow by the
varying flow profile may be made with the aid of the following
equation:
It may be noted that the percent error will increase as a larger turn
down range is sought. It is therefore advisable that PF
chosen to correspond to the actual conditions expected and not on the
maximum
and
Flowmeter.
Table B - Profile Scaling Factor Chart
Reynolds Number (Rn)
4 x 10
6
8
1 x 10
2
4
6
8
1 x 10
2
4
6
8
1 x 10
2
4
HP-208
% ERROR
=
minimum capabilities of the Profile/Insertion
3
4
5
6
Page 16 of 17
(
−
PF
PF
MAX
2
PF
AVE
Profile Scaling Factor (PF)
)
100%
MIN
and PF
MAX
MIN
.791
.796
.797
.800
.806
.811
.813
.816
.818
.827
.837
.841
.847
.849
.865
.865
HP Insertion Meter
be
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