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March 2004
Unpacking
Site Considerations
Electronics Enclosure
Location
Transducer Location
Cable Lengths
1-2
Carefully remove the electronics enclosure and the transducer/cable
assembly from the shipping containers. Before discarding any of the
packing materials, account for all components and documentation
listed on the packing slip. The discarding of an important item along
with the packing materials is all too common. If anything is missing
or damaged, contact the factory immediately for assistance.
Because the relative location of the transducers and the electronics
enclosure is important, use the guidelines in this section to plan the
UTX878 installation.
The standard UTX878 electronics enclosure is epoxy-coated
aluminum rated for weatherproof NEMA4X, IP67 applications.
Typically, the enclosure is mounted as close as possible to the
transducers. When choosing a site, make sure the location permits
easy access to the electronics enclosure for programming,
maintenance and service.
For a given fluid and pipe, the Model UTX878's accuracy depends
primarily on the location and spacing of the transducers. In addition
to accessibility, when planning for transducer location, adhere to the
following guidelines:
•
Locate the transducers so that there are at least 10 pipe diameters
of straight, undisturbed flow upstream and 5 pipe diameters of
straight, undisturbed flow downstream from the measurement
point. Undisturbed flow means avoiding sources of turbulence in
the fluid such as valves, flanges, expansions, and elbows; avoiding
swirl; and avoiding cavitation.
•
Locate the transducers on a common axial plane along the pipe.
Locate the transducers on the side of the pipe, rather than the top or
bottom, since the top of the pipe tends to accumulate gas and the
bottom tends to accumulate sediment. Either condition will cause
increased attenuation of the ultrasonic signal. There is no similar
restriction with vertical pipes. However, vertical pipes with
downward flow should be avoided in order to insure a full pipe at
the measurement point.
Locate the electronics enclosure as close as possible to the
transducers. GE Panametrics can supply UTX878 transducer cables
in fixed lengths from 6 ft (2 m) up to 100 ft (30 m) in length for
remote location of the electronics enclosure.
Installation
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