5-2
1010GCNFM-3C
Section 5
5.1.3 CLAMP-ON TRANSDUCER MOUNTING MODES
Siemens clamp-on transducers support Direct or Reflect mounting modes. The flowmeter recommends
a mounting mode after analyzing your pipe and liquid data entries. However, you can install clamp-on
transducers in the way that best suits your application and the transducer type you purchased.
5.1.2 SELECTING A LOCATION FOR CLAMP- ON TRANSDUCERS
z Locate the transducers downstream from the center of the longest available straight run. A location
ten pipe diameters or greater downstream from the nearest bend will provide the best flow profile
conditions.
z 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 flow disturbances, vibration, sources of heat,
noise, or radiated energy.
z Avoid mounting the transducers on a section of pipe with any external scale. Remove all scale, rust,
loose paint, etc., from the location.
z Do not mount the transducers on a surface aberration (pipe seam, etc.).
z 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.
z Never mount transducers under water, unless you order submersible units and you install them in
accordance with factory instructions.
z Never mount transducers on the top or bottom of a horizontal pipe. The best placement on a horizon-
tal pipe is either the nine o’clock or three o’clock position for Reflect Mode, or one transducer at nine
o’clock and one transducer at three o’clock for Direct Mode. Mounting on a vertical pipe is recom-
mended 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.
END VIEW OF PIPE (Horizontal Plane)
Transducer located at 9 o’clock
Transducer located at 3 o’clock
Upstream
Transducer
Sonic Path
Pipe
Downstream
Transducer
REFLECT MOUNT
(Pipe shown at 90
0
for ease in visualizing sonic path)
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