GE PanaFlow MV80, Руководство пользователя

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PanaFlow™ MV80 & MV82 User’s Manual 19
Chapter 2. Installation
2.3.1e Insertion Guidelines
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 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. That is, its “wetted” depth
from the wall to the centerline of the sensing head is five inches.
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
29.47 inches.
•
Compact Probe configuration is used with compression fitting process connections. The length ( S ) of the stem
is 13.1 inches.
•
12-Inch Extended Probe configuration is used with exceptionally lengthy flowmeter process connections. The
length (
S
) of the stem is 41.47 inches.
2.3.1f Selecting the Correct Insertion Formula
Depending on your flowmeter's process connection, use the applicable insertion length formula and installation
procedure as follows:
•
For flowmeters with a compression type connection (NPT or flanged), follow the instructions beginning in
“Installing Flowmeters with a Compression Connection” on page 20 .
•
For flowmeters with a packing gland type connection (NPT or flanged), configured with an insertion tool,
follow the instructions in
“Installing Flowmeters with a Packing Gland Connection” on page 23 .
•
For flowmeters with a packing gland type connection (NPT or flanged), configured without an insertion tool,
follow the instructions in
“Installing Flowmeters with a Packing Gland Connection (No Insertion Tool)” on
page 28 .
WARNING!
An insertion tool must be used for any installation where a flowmeter is inserted under
pressure greater than 50 psig.