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F-1500 Turbine Flow Meter Manual 02/18 - 1018-6 / 35726
Page 15
2.3 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
center line of the meter’s sensing head is located at the pipe’s center line. For pipe sizes larger
than 10”, the center line 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 center line 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 28.67”.
• 12-Inch Extended Probe configuration is used with exceptionally lengthy flow meter process
connections. The length, S, of the stem is 40.67”.
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.
!
2.3.1 Installing Flow Meters *
Use the formula below to determine the insertion depth for flow meters (NPT and flanged)
equipped with an insertion tool. To install, see the next page for instructions for meters with a
permanent insertion tool. For meters with a removable insertion tool, see page 17.
Figure 3. Insertion Calculation (Meters with Insertion Tool)