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Measuring P and L
Measuring P and L Dimensions
If you are using wetted transducers, the AT868 requires you to enter
the path length (P) and the axial dimension (L). P is the transducer
face-to-face distance, and L is the axial projection of P in the flow
stream.
To determine L, physically measure the distance between the center
of the transducer ports at the inside wall as shown in Figure B-1
below. If such a measurment is not possible, consult the factory for
assistance.
Pipe Thickness
Figure B-1: 180
To determine P, you need the following information:
•
the pipe inside diameter (ID)
•
the pipe wall thickness (WT)
•
the installed pipe coupling length (CL)
•
the transducer face depth (FD)
•
the mounting angle (MA)
P
θ
L
Top View
o
Transducer Installations
September 2004
Pipe OD
B-1
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