29
Single entry point method
1
13.
IMPORTANT NOTE
Due to software configuration, all calculations are
in metric units. Therefore if using an imperial pipe,
the diameter MUST be converted into millimeters
(1 in. = 25.4 mm, for example, a 36 in. pipe = 914
mm).
2 Calculate the insertion factor
3 Refer to the Instruction manual (OI/FET400-EN) and enter an
Insertion Factor of value equal to Fi.
4 Record the flow velocity reading.
5
diameter.
6 Calculate the insertion factor.
7 Refer to the relevant Instruction manual (OI/FET400-EN) and
enter an Insertion Factor of value equal to Fi.
8 Record the flow velocity reading.
9 Calculate the ratio of the two values recorded.
• if the calculated ratio is between 0.95 and 1.05, the flow
profile is acceptable and the procedure detailed on page
13 can be used,
or
• if the calculated ratio is not between 0.95 and 1.05, re-site
the insertion sensor for optimum accuracy.
Dual entry point method
Refer to page 16 and fit a second mounting boss directly
opposite the one already fitted.
IMPORTANT NOTE
Due to software configuration, all calculations are in
metric units. Therefore if using an imperial pipe, the
diameter MUST be converted into millimeters (1 in. =
25.4 mm, for example, a 36 in. pipe = 914 mm)..
1
through the original mounting boss.
2 Calculate the insertion factor.
3 Refer to the Instruction manual (OI/FET400-EN) and enter a
Insertion Factor of value equal to Fi.
4 Record the flow velocity reading.
5
through the second mounting boss.
6 Record the flow velocity reading.
7 Calculate the ratio of the two values recorded
• if the calculated ratio is between 0.95 and 1.05, the flow
profile is acceptable and the procedure detailed on page
13 can be used
or
• if the calculated ratio is not between 0.95 and 1.05, re-site
the insertion sensor for optimum accuracy
Full velocity profile
For installations with very poor and asymmetric velocity
profiles (for example as rejected, see
Single Entry Point
Method, step 9
) a full velocity profile provides an improved
accuracy of reading. To facilitate this ABB have developed
ScrewDriver software for the PC that calculates Fi and Fp for
any measured velocity profile – see IM/SDR section 'ABB Flow
Profiling'.
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