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35
..... Pipe selection & preparation
f.
Pipes with excessive corrosion or scaling create conditions which can make accurate measurement
difficult or impossible; if possible, avoid selecting these sections of pipe as mounting locations.
g.
Remove any dirt, grease, rust, loose paint, or scale from the pipe surface prior to mounting the
transducers. To obtain best results on aging and rough pipes, a file or grinder may be required to
clean the pipe down to bare metal.
If your application cannot follow these guidelines completely, meaningful flow measurements (with some
loss in accuracy and stability) may still be obtained, depending on signal quality.
4.3
Spacing & Mounting the Transducers
Once you have selected a proper transducer site, you must ensure proper transducer spacing and
mounting in order to maximize signal strength and accuracy:
1.
Determine which mounting method is appropriate for your application: V, W, Z, WV, WW.
2.
Refer to
Section 3 (page 8)
to configure the flowmeter via the keypad or to the UltraScan manual to
configure with UltraScan, and note the value required for the transducer spacing (value calculated by
and displayed on flowmeter LCD or in UltraScan).
3.
Clean the area of the pipe designated as the mounting location. Remove any rust, scale, or loose
paint; well-bonded paint does not need to be removed.
On horizontal pipes, the transducers should be mounted in the 3 o’clock and
9 o’clock positions in order to avoid situations which can cause signal loss, i.e.,
sediment along the bottom of the pipe, gas bubbles or air pockets along the top
of the pipe.
4.
Refer to one of the following sections to mount the transducers according to the selected mounting
method:
a.
V method (Section 4.4.1, page 37)
b.
W method (Section 4.4.2, page 38)
c.
Z method (Section 4.4.3, page 39)
d.
WV and WW methods (Section 4.4.4, page 42)
5.
Install the portable slide rack:
a.
Extend the chain hooks by unscrewing the chain adjustment knobs to their fullest extent. The
knobs will stop at the end of the adjustment and should not be removed.
b.
Place the rack against the pipe and wrap the chains around the pipe.
c.
With excess slack removed from the chain, connect the chains to the chain hooks.
d.
Tighten the chain hooks by screwing down both chain adjustment knobs.