-3-
OPERATION:
Connect the instrument plug into a
Grounded power outlet of proper voltage. Place the
Contour Probe legs upon the work surface with the
suspected defect at right angles to the legs (Good
contact will produce the best results). Push the test
switch to energize the instrument. Lightly dust or
float dry magnetic inspection powder over the area
being inspected. Defect indications will be revealed
in a direction shown on figure 2. Turn the Probe 90
degrees from the first test and repeat the process.
This method may also be utilized when applying a
wet medium. Check all procedures and standards for
further details involving inspection specifics.
DEMAGNETIZATION:
Small pieces, which have
become residually magnetized, may be easily
demagnetized by the following procedure: Energize
the Probe and pass small parts through the area
between the leg
ends “feet” and withdraw to a
distance of approximately two feet. On large pieces, place the Probe in the same position as
inspection, energize the Probe and lift from the work surface to a distance of approximately two
feet. This procedure may need to be performed more than once to remove the residual field.
AC MAGNETIZATION:
An AC magnetic field induced into a part is a
“skin” or surface field and
does not penetrate the cross section of the material. A by-product of AC is in the form of eddy
currents. These eddy currents tend to guide or direct the magnetic field in a narrow pattern
between the poles. Another by-product is a vibratory action, which adds mobility to the inspection
particles to form a more highly defined powder build-up at the defect. For these reasons, an AC
magnetic field is the most desirable for the detection of surface breaking defects.
CAUTION:
Small parts may become magnetically saturated due to excessive field application. This
may cause a masking effect to the point where it is impossible to define a defect.
WARRANTY:
The Parker 100 series are warranted against malfunction due to defective material
and or workmanship. The defective unit will be repaired or replaced (less incoming freight charges)
for a period of one year from the date of sale. This repair warranty does not apply to altered units.
Repair or replacement of the defective unit will be made at the discretion of Parker Research
Corporation. Repaired or replacement unit(s) will be returned to the original customer prepaid.
The obligation of Parker Research Corporation is limited to the repair or replacement of the
defective unit. No other obligation is expressed or implied. Parker Research Corporation assumes
no liability from any claims arising from the use of this equipment.
CAUTION:
For the correct and safe use of this equipment, training of operating personnel is
required. Use of proper inspection procedures, standards compliance and safety requirements is
the obligation of the user.
FIG. 2
