Mounting; Sensor Mounting Location - GF UD2100 Betriebsanleitung

Operating Instructions
6

Mounting

6.1

Sensor Mounting Location

The position of the sensor is one of the most important considerations for accurate flow measurement.
The same location guidelines apply to Doppler as most other types of flow meters.
Vertical or horizontal pipe
Vertical pipe runs generally provide evenly distributed flow. On
Horizontal pipes and liquids with high concentrations of gas or
solids, the sensor should be mounted on the side (3 or 9 o'clock
position) to avoid concentrations of gas at the top of the pipe, or
solids at the bottom. For
liquids with minimal gas bubbles (e.g. potable water) the
sensor should be mounted on the top of a horizontal pipe (12
o'clock position) to obtain the best signal strength.
Straight run requirements
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 five diameters downstream of the transducers is
the minimum recommended distance for proper operation.
Additional considerations are outlined below.
Do not, if possible, install the transducers downstream from a throttling valve, a mixing tank, thedischarge of a positive
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displacement pump or any other equipment that could possibly aerate the liquid. The best location will be as free as possible
from flow 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
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location prior to mounting the transducers.
Do not mount the transducers on a surface aberration (pipe seam, etc.).
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Do not mount transducers from different ultrasonic flow meters on the same pipe.
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Do not run the transducer triaxial cables in common bundles with cables from other instrumentation.You can run these cables
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through a common conduit ONLY if they originate at the same flow meter.
Never mount transducers under water.
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NOTICE!
Unusual flow stream disruptions.
► In some cases, longer straight runs may be necessary where the transducers are placed downstream from devices which cause
unusual flow profile disruptions or swirl. For example: modulating valves, or two elbows in close proximity and out of plane.
UD2100 Ultrasonic Doppler Flow Meter
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