Siemens SITRANS FUH1010PVDX, Руководство по эксплуатации, Страница: 209 / 308

Installation Instructions
CC129A-7
CN4973 February 2005
1
1. SELECTING A LOCATION FOR TRANSDUCER MOUNTING
Locate the transducers downstream from the center of the longest available straight run. A
location 20 pipe diameters or greater downstream from the nearest bend or reducer will pro-
vide the best flow profile conditions.
Avoid installing the transducers downstream of control valves, compressors or any other equip-
ment that could possibly interfere with the acoustic signal. 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 location.
Do not mount the transducers on a surface aberration (e.g., pipe seam, etc.).
Do not mount transducers from different ultrasonic flowmeters on the same pipe. Also, do not
run the transducer cables in common bundles with cables from communication equipment,
other Siemens systems or any type of ultrasonic equipment. You can run these cables through
a common conduit ONLY if they originate at the same flowmeter.
Never mount transducers under water, unless you order submersible units and you install them
in accordance with factory instructions.
Never mount transducers on the top or bottom of a horizontal pipe. The best placement on a
horizontal pipe is either the nine o’clock or three o’clock position for Reflect Mode, or one trans-
ducer at nine o’clock and one transducer at three o’clock for Direct Mode. For liquid flow mea-
surement mounting on a vertical pipe is recommended only if flow is in the upward direction.
When mounting on a vertical pipe flowing in a downward direction make sure there is
sufficient back pressure in the system to maintain a full pipe.
CC129A DRY FILM
COUPLANT/DAMPING MATERIAL
Installation Instructions
Siemens CC129A dry film couplant/damping material is an adhesive backed viscoelastic polymer
sheet that provides excellent acoustic coupling without concern for couplant washout. For Clamp-
On gas applications this material effectively absorbs unwanted pipe noise to lower the minimum
pressure required for flow measurement.
NOTE: In the following paragraphs, references to the 9 o’clock position indicate the sec-
tion of horizontal pipe that is closest to you.
Recommended transducer
placement for Dual Beam
reflect mount.
Transducer located
at 3 o’clock
Transducer located
at 9 o’clock
END VIEW
(Horizontal Plane)