ONICON F-4000 Series - Manual (Page 9)

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F-4000 Series Ultrasonic Flow Meter Manual 05/15 - 0707-13 / 18838 Page 9
SECTION 3.0: INSTALLATION
3.1 OVERVIEW
Each F-4000 Series Ultrasonic Flow Meter is provided with a pair of precision matched ultrasonic
transducers. The transducers are mounted (clamped) on to the outside wall of the pipe. Coaxial
cables convey the transducer signals to the wall mount enclosure containing the signal processing
circuitry and the user interface display. Ultrasonic transducers can be configured to operate
in either reflect or direct operating modes. The choice of operating mode is dictated by the
configuration settings programmed into the meter. For new installations, configuration data is
programmed into the meter prior to shipment. This data is saved as a “Site”. Site data determines
the transducer operating mode and the spacing between the transducers. This information is
provided with the installation hardware in a document titled, “F-4000 Site Installation Details”.
Reflect Mode
Reflect mount is the recommended operating mode whenever possible. It is the simplest way
to mount the transducers. Operating in the reflect mode also minimizes the effects of some flow
distortions and enables the use of the auto zero function.
Direct Mode
Direct mount provides a shorter sonic beam path. This usually improves performance with
sonically attenuative liquids or pipe materials. Direct mount is required for plastic pipes. Direct
mounting only requires half the distance between electrodes when compared to the reflect mode
and may be the only option if the availability of mounting space is limited.
Transducers
Reflect Mode
Pipe Wall
Direct Mode
Flow Flow