GE AquaTrans AT868 - Taking Measurements

September 2004
B-2 Measuring P and L Dimensions
Measuring P and L (cont.) Use Figure B-2 below to properly measure the pipe coupling length.
Typically, the transducer face is positioned just outside the inside
diameter (ID) of the pipe, or slightly retracted inside the coupling.
Figure B-2: Determining the Pipe Coupling Length
Then, use the following formula to determine the P dimension:
For example, if:
• inside diameter (ID) = 48”
• wall thickness (WT) = 3/8”
• installed coupling length (CL) = 2.0”
• transducer face depth (FD) = 1.75”
• mounting angle (MA) = 45°
Then, the P dimension would be:
FD
CL
MA 45
o
P
ID 2 WT()+[]
MA()cos
-----------------------------------2CLFD–()+=
P
48 2 0.375()+[]
45°()cos
-------------------------------------- 2 2 . 0 1 . 7 5–()+69.4″==