DMTA-20073-01EN, Rev. C, November 2015
Chapter 1
22
Figure 1-4 Underside of RollerFORM, showing the three wheels and encoder
The RollerFORM is equipped with the following wheels:
• The liquid-filled acoustic wheel
The liquid-filled acoustic wheel contains the phased array probe, which is housed
in its axle. When the acoustic wheel’s liquid chamber is filled with water, it must
be cleaned periodically. When the chamber is filled with noncorrosive glycol, it
does not require periodic cleaning. The probe-axle can also be changed. For more
information, see the following sections:
— “Cleaning the Liquid Chamber” on page 85
— “Changing the Probe-Axle” on page 77
• The adjustable middle wheel
The middle wheel’s height can be adjusted, depending on the surface to inspect.
For more information, see “Adjusting the Middle Wheel” on page 52.
• The rear roller
The rear roller is the primary location of the Mini-Wheel encoder.
The Mini-Wheel encoder can be changed. For more information, see “Changing
the Mini-Wheel Encoder” on page 110.
Scanner umbilical
cable with sheath
Mini-Wheel encoder
Probe angle-
adjustment knob
Acoustic wheel Middle wheel
locking lever
Adjustable middle wheel with
rollers and skid plate
Alternate encoder
holder cavity
Probe-axle Probe cable
Tire
Plain acoustic wheel
flange
Acoustic wheel
flange with liquid-
control valves
(probe-cable side)
Rear roller