GE AquaTrans AT868, User Manual

Page: 124 / 158

Measuring P and L Dimensions D-1
September 2004
Measuring P and L
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 D-1
below, if possible. If not, consult the factory.
Figure D-1: 180
o
Transducer Installations
To determine P, you need the following:
•
the pipe inside diameter (ID)
•
the wall thickness (WT)
•
the installed pipe coupling length (CL)
•
the transducer face depth (FD)
•
the mounting angle (MA)
T Vi
Pipe Thickness
L
P
Pipe OD
θ