Onicon F-4000 Series Manual do Utilizador descarregar pdf (Página 11)

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F-4000 Series Ultrasonic Flow Meter Manual 05/15 - 0707-13 / 18838 Page 11

• Do not, if possible, install the transducers downstream from a throttling valve, a mixing tank,

the discharge of a positive displacement pump or any other equipment that could possibly

aerate the liquid. The best location will be as free as possible from ow disturbances,

vibration, sources of heat, noise, or radiated energy.

• Avoid mounting the transducers on a section of pipe with any external scale. Remove all

scale, rust, loose paint, etc., from the location prior to mounting the transducers.

• Do not mount the transducers on a surface aberration (pipe seam, etc.).

• Do not mount transducers from different ultrasonic ow meters on the same pipe.

• Do not run the transducer coaxial cables in common bundles with cables from other

instrumentation. You can run these cables through a common conduit ONLY if they originate

at the same ow meter.

• Never mount transducers under water, unless you have specically purchased submersible

transducers and you install them in accordance with factory instructions.

• Avoid mounting transducers on the top of a horizontal pipe. The best placement on a

horizontal pipe is either the 10:00 or 2:00 position for reect mode, or one sensor at 9:00 and

one sensor at 3:00 for direct mode.

• Do not mount transducers on the bottom of a horizontal pipe.

• Mounting on a vertical pipe is recommended only if ow is in the upward direction. When

mounting on a vertical pipe owing in a downward direction, make sure there is sufcient

back pressure in the system to maintain a full pipe.

IMPORTANT NOTE

In some cases, longer straight runs may be necessary where the transducers are placed downstream

from devices which cause unusual ow prole disruptions or swirl; for example, modulating valves

or two elbows in close proximity and out of plane, etc.

The Transducers

For best results, the transducers must be installed on a straight run of pipe, free of bends, tees,

valves, transitions, insertion probes and obstructions of any kind. For most installations, ten

straight unobstructed pipe diameters upstream and ve diameters downstream of the transducers

is the minimum recommended distance for proper operation. Additional considerations are

outlined below.

Flow

10 Dia. 5 Dia.

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