ONICON F-2600 - Manual (Page 27)

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F-2600 & F-2700 Vortex Flow Meter Manual 02/15 - 0808-7 / 19204 Page 27
2.4 FLOW METER INSERTION
The sensor head must be properly positioned in the pipe. For this reason, it is important that
insertion length calculations are carefully followed. A sensor probe inserted at the wrong depth
in the pipe will result in inaccurate readings.
Insertion flow meters are applicable to pipes 2" and larger. For pipe sizes 10" and smaller, the
centerline of the meter’s sensing head is located at the pipe’s centerline. For pipe sizes larger than
10", the centerline of the sensing head is located in the pipe’s cross section 5" from the inner wall
of the pipe; i.e., its “wetted” depth from the wall to the centerline of the sensing head is 5".
Insertion flow meters are available in two probe lengths:
Standard Probe configuration is used with most flow meter process connections. The length, S, of
the stem is 29.47".
12-Inch Extended Probe configuration is used with exceptionally lengthy flow meter process
connections. The length, S, of the stem is 41.47".
Use the Correct Insertion Formula
Depending on your flow meter’s process connection, use the applicable insertion length formula
and installation procedure as follows:
• Flow meters with a packing gland type connection (NPT or flanged) configured with an
insertion tool, follow the instructions beginning on page 29.
• Flow meters with a packing gland type connection (NPT or flanged) without an insertion tool,
follow the instructions beginning on page 32.
!
WARNING
An insertion tool must be used for any installation where a flow meter is inserted under pressure
greater than 50 psig.