Xylem FM500 ULTRASONIC FLOW METERS - Manual (Page 42)

Page 42
6.6
Doppler
Method
Transducer
Installation
The pipe mounting surface must be clean, smooth and free of any surface imperfections.
Remove all insulation material, loose paint, coatings, etc. Clean the pipe surface
thoroughly. Use sandpaper if necessary to remove surface imperfections. Do not mount
the transducers over weld seams.
Place a mark on the pipe where the first transducer will be located. Be sure to locate the
transducers on the side of horizontal runs of pipe.
Doppler Mode:
When the meter is operated in the Doppler mode, marking the second transducer
location is not necessary. Simply install both transducer directly opposite from each
other.
If the fluid to be measured contains particles, the meter should be operated using the
Doppler measurement method. For Doppler operation, the transducers will be mounted
directly opposite each other as shown below.
NO
NO
Air bubbles may be present
OK
Sediment may be present
Horizontal
O
45
O
45
DOPPLER MOUNTING MODE
6.5
Pipe
Surface
Preparation
Ultrasonic Flowmeter