Xylem FM500 ULTRASONIC FLOW METERS - Manual (Page 46)

Page 46
An acoustic coupling material must be placed between the transducer and the pipe
surface at the point where the sound waves enter the pipe.. Without this material, the
ultrasonic sound waves will not penetrate into the pipe. The meter package includes
three different gasket materials for this purpose.
The blue gasket should be used for permanent installations. This gasket will be damaged
be repeated installations.
The white gasket should be used for non-permenant installations such as in portable
applications. This gasket will withstand multiple installations.
Dow Corning Silicone Seal #111 may be used in place of the gaskets if desired.
1) Peel off the thin paper backing from the blue gasket and place the gasket on the
transducer completely covering the waveguide.
2) Remove the thick plastic backing from the gasket before positioning the transducer on
the pipe.
The white gasket does not include backing tape. Position the gasket on the transducer
completely covering the entire bottom surface of the transducer.
TRANSDUCER
WHITE
GASKET
WHITE GASKET PLACED
ON TRANSDUCER
WHITE GASKET INSTALLATION
6.9
Transducer
Acoustic
Mounting
Gaskets
TRANSDUCER
BLUE
GASKET
BLUE GASKET PLACED
ON TRANSDUCER
BLUE GASKET INSTALLATION
TRANSDUCER
BOTTOM VIEW
TRANSDUCER
BOTTOM VIEW
Ultrasonic Flowmeter