IM-P198-05 MI Issue 218
3.7 Flowmeter 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 flowmeters are applicable to pipes DN50 (2") and larger. For pipe sizes DN250 (10")
and smaller, the centerline of the meter's sensing head is located at the pipe's centerline.
For pipe sizes larger than DN250 (10"), the centerline of the sensing head is located 5" from
the inside wall of the pipe.
Insertion flowmeters are available in three probe lengths:
Standard Probe configuration is used with most flowmeter process connections. The length,
S, of the stem is 728.21 mm (28.67").
Compact Probe configuration is used with compression fitting process connections. The
length, S, of the stem is 312.42 mm (12.3").
12" Extended Probe configuration is used with exceptionally lengthy flowmeter process
connections. The length, S, of the stem is 1 033.02 mm (40.67").
3.7.1 Use the correct Insertion formula
Warning!
An Insertion tool must be used for any installation where a flowmeter is inserted
under pressure greater than 3.45 bar g (50 psi g).
Depending on your flowmeter's process connection, use the applicable insertion length
formula and installation procedure as follows:
-
flowmeters with a compression type connection (NPT or flanged) follow the instructions
beginning on page 19.
-
flowmeters with a packing gland type connection (NPT or flanged) configured with an
insertion tool, follow the instructions beginning on page 21.
-
flowmeters with a packing gland type connection (NPT or flanged) without an insertion
tool, follow the instructions beginning on page 26.
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