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DMTA-20073-01EN, Rev. C, November 2015

Chapter 3

To remove air bubbles from the liquid chamber

1. Tap and shake the acoustic wheel to gather together the air bubbles. Take special

care to remove the bubbles that are adhering to the interior surface of the liquid

chamber. If left in place, these bubbles may interfere with the propagation of

ultrasound waves.

2. Turn the RollerFORM probe-cable side up, so that the acoustic wheel is at an

angle, and the OUT valve is at the highest possible position, and then tap the

acoustic wheel, so the bubbles disappear from view in the translucent part of the

acoustic wheel.

3. Lightly squeeze the acoustic wheel, open the OUT valve to let the remaining air

out, and then close it as soon as a little glycol or water flows out. Maintain the

pressure on the tire until the OUT valve has been closed.

4. Put the RollerFORM back to the upright position and look for the presence of

bubbles.

Repeat steps 1 to 4 as many times as necessary to remove all bubbles from the

liquid chamber.

5. Make sure that the acoustic wheel’s liquid chamber is properly filled. With the

RollerFORM sitting on a flat surface and without any downward pressure

applied on the handle, verify that a gap measuring 2 mm to 3 mm (0.08 in. to

0.12 in.) remains between the black acoustic wheel flanges and the surface to

inspect (see Figure 3-5 on page 47).

6. Fill the acoustic wheel with glycol or water if needed. For more information, see

“Filling the Acoustic Wheel’s Liquid Chamber” on page 39.

The RollerFORM’s bubble trap can be used to conceal bubbles during an inspection.

Turn the scanner on its side so that the flange with the liquid-control valves is at the

highest possible position, allowing the bubbles to float up into the trap. Gently return

the RollerFORM to the horizontal position; the bubbles will stay trapped if they are

not too large. If this doesn’t work, then the acoustic wheel will have to be refilled (see

“Filling the Acoustic Wheel’s Liquid Chamber” on page 39).

Olympus RollerFORM User Manual

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