To Confirm A Leak; Overcoming Difficulties; Shielding Techniques - UE Systems ULTRAPROBE 10000 Instruction Manual
Digital ultrasonic inspection system
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Also See for ULTRAPROBE 10000:
- Manual (56 pages) ,
- Instructions manual (6 pages) ,
- Pumps and cavitation inspection (6 pages)
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7. Listen for a "rushing" sound while observing the meter. Follow the sound to the loudest point. The
meter will show a higher reading as the leak is approached.
8. In order to focus in on the leak, keep reducing the sensitivity setting and move the instrument clos-
er to the suspected leak site until you are able to confirm a leak.
To confirm a leak
Position the Scanning Module, or the rubber focusing probe (if it is on the scanning module) close to the
suspect leak site and move it, slightly, back and forth, in all directions. If the leak is at this location, the
sound will increase and decrease in intensity as you sweep over it. In some instances, it is useful to posi-
tion the rubber focusing probe directly over the suspect leak site and push down to "seal" it from sur-
rounding sounds. If it is the leak, the rushing sound will continue. If it is not the leak site, the sound will
drop off.
Overcoming difficulties
1. Competing Ultrasounds If competing ultrasounds make it difficult to isolate a leak, there are two
approaches to be taken:
a. Manipulate the environment. This procedure is fairly straight forward. When possible, turn off
the equipment that is producing the competing ultrasound or isolate the area by closing a door
or window.
b. Manipulate the instrument and use shielding techniques. If environmental manipulation is not
possible, try to get as close to the test site as possible, and manipulate the instrument so that
it is pointing away from the competing ultrasound. Isolate the leak area by reducing the sensi-
tivity of the unit and by pushing the tip of the rubber focusing probe up to the test area, check-
ing a small section at a time.
Shielding techniques
Since ultrasound is a high frequency, short wave signal, it can usually be blocked or "shielded".
NOTE:
When using any method, be sure to follow your plant's or company's safety guidelines. Some
common techniques are:
a. Body: Place your body between the test area and the competing sounds to act as a barrier
b. Clip Board: Position the clip board close to the leak area and angle it so that it acts as a barrier
between the test area and the competing sounds
c. Gloved Hand: (USE CAUTION) using a gloved hand, wrap the hand around the rubber focus-
ing probe tip so that the index finger and the thumb are close to the very end and place the
rest of the hand on the test site so that there is a complete barrier of the hand between the test
area and the background noise. Move the hand and instrument together over the various test
zones.
d. Wipe rag: This is the same method as the "gloved hand" method, only, in addition to the glove,
use a wipe rag to wrap around the rubber focusing probe tip. Hold the rag in the gloved hand
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