Series | Chapter 2 Installation |
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Flow Meter Insertion
Warning! An insertion tool must be used for any installation where a flow meter is inserted under pressure greater than 50 psig.
The sensor head must be properly positioned in the pipe. For this rea- son, it is important that insertion length calculations are carefully fol- lowed. A sensor probe inserted at the wrong depth in the pipe will result in inaccurate readings.
Insertion flow meters are applicable to pipes 2 inch and larger. For pipe sizes ten inches and smaller, the centerline of the meter’s sensing head is located at the pipe’s centerline. For pipe sizes larger than ten inches, the centerline of the sensing head is located in the pipe’s cross section five inches from the inner wall of the pipe; i.e., its “wetted” depth from the wall to the centerline of the sensing head is five inches.
Insertion flow meters are available in three probe lengths:
Standard Probe configuration is used with most flow meter process connections. The length, S, of the stem is 29.47 inches.
Compact Probe configuration is used with compression fitting process connections. The length, S, of the stem is 13.1 inches.
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 compression type connection (NPT or flanged) follow the instructions beginning on page
•Flow meters with a packing gland type connection (NPT or flanged) configured with an insertion tool, follow the instructions beginning on page
•Flow meters with a packing gland type connection (NPT or flanged) without an insertion tool, follow the instructions beginning on page