Xylem FM500 ULTRASONIC FLOW METERS - Manual (Page 41)

NO
NO
Air bubble
Sediment
NO
NO
Down flows
must have
back pressure
Pipe must be full
Air could be trapped
!
Page 41
When the meter is operated in the Doppler measurement method, the transducers are
ALWAYS mounted directly opposite each other. The separation is therefore zero.
When the meter is operated in the Transit-Time measurement method, the front faces
of the transducers must be positioned the correct distance apart.
The correct separation distance is dependent on the pipe size, pipe type and chosen
mounting mode. When factory configured, the separation distance and mounting mode is
printed on the serial label. If the meter has not been factory configured, or if a new
configuration is required, the
configuration data
must be input before proceeding. See section 5 for instructions on how to create or modify
a configuration.
For meters so equipped, the separation distance (as calculated based on the currently
active configuration set) is also shown on the LCD display and on the Remote
Communications PC Software display screen.
pipe size, pipe type and mounting mode
6.4
Transducer
Separation
Distance
Separation
Distance
625.38
4345625.38
SETUP SWAP RELAY CLEAR
U.S. Gallons
Relay #2 Relay #1
off Active
5 T 2.32 in. [ ¢ ¢ ¢ £ ]
U.S. Gallons / min
Currently Active Configuration set
Separation Distance
Currently Active Configuration set
Separation Distance
LCD Display Screen
Communications PC Software Screen
A B
1480
Ultrasonic Flowmeter