W-FI Guide
2
approximately 18 to 24 Gauss, thus an inspector uses the W-FI-20 to ensure his residual
field is strong enough prior to applying his inspection media (Wet or Dry). A workpiece
can be magnetically saturated prior to (or after) inspection, and the inspector must
measure the field strength and polarity prior employing his demagnetization procedure.
Therefore, the W-FI-50 is used to measure fields that are too strong for Magnetic Particle
Inspection.
The W-FI is intended to be disposable, so when the user's 'Quality Control Procedure'
requires the unit to be recalibrated, it can be simply replaced. Western does offer 3
"Verification Fixtures" to measure W-FI accuracy however, as W-FI's can only be
verified, the user has two choices, either verify it or replace it. This may seem wasteful,
but W-FI's sell for less than the cost of competitive 'Calibrateable Field Indicators' and
are priced competitively with Calibration Charges for these Calibrateable units.
Instructions
•
Hold the W-FI so the Arrow points toward the surface of the Work Piece. Laying the
unit flat on its back is not correct.
•
Do not expose W-FI’s to AC Magnetic Fields.
•
W-FI’s are delicate Instruments, not Hockey Pucks.
•
When performing Demag with a Reversing & Decaying DC Field, pull the W-FI as far
away as possible. A typical arm length is satisfactory.
•
“Pinning” the pointer in a strong field will affect the accuracy of a W-FI.
•
Field Orientation can be measured by placing a W-FI flat on it’s back, and rotating it
until the maximum field is measured. At the maximum reading, the direction of the
field is parallel with the instrument pointer (not the arrow).
Verification
●
Verification Fixtures are available for each of the 3
models of W-FI’s.
●
To verify the accuracy of a corresponding W-FI, simply
place it in the fixture as illustrated, with the arrow lined up
to the indicator line on the fixture.
●
Each Verification Fixture has a Certification Decal affixed
to the front on the Case, Indicating the date of Field
Confirmation.
●
It takes just seconds to verify the accuracy of a W-FI.
