WC-9UW
5
performed by Western Instruments to test Product Performance, however are
far more demanding than typical field inspections, as units are typically not
activated on a continuous basis (see
Operational Parameters
). The lift
capabilities of the WC-9UW can be easily confirmed with 5 Pull Test Bars, of
10 Pounds (4.54Kg) each, such as 5 of Western Instruments’ W-PT
,
fastened together.
Battery Removal
When the Battery Pack needs to be removed, for cleaning or charging,
remove The Switch Plunger, followed by all 4 of the 10-24 retaining fasteners.
Carefully slide the Battery Pack out of the Junction Tube, immediately drying
and cleaning all components.
Extended Duty Kit
The
Extended Duty Kit
, simply consists of an Extra Battery Pack. Follow the
above instructions, substituting the extra Battery for the spent one.
3. Operational Parameters
–
The Operational Parameters or Duty Cycle
for the operation is set to avoid damage to the internal coil or the Output
Module, and must be observed.
Pulsed DC Operation:
It is recommended that the operator does not keep
the Yoke on for more than 2 minutes at a time. This activation time should be
followed by an equal time off. This 50% duty cycle is set not to protect the
Coil or the Electronic Module, but is imposed to avoid rapid draining of the
Battery Pack. A fully charged Battery Pack will last 2 hours under continuous
activation, which equates to approximately an 8 hour shift of ‘maintenance’
inspection (as per Western Insturments’ Battery Duration Tests). The battery
condition can be tested with either of the WC-9’s Battery Voltage Indicators
as outlined above.
Typical operation is 5 - 15 seconds on, while applying inspection media,
followed by 5 - 15 seconds off repositioning the Yoke to the target area.
If the Yoke is used for prolonged periods of time such as 2 to 3 hours of
continuous cycling, as outline above, the Yoke will get warm. If the WC-9 is
used in this manner the operator must provide time for a sufficient cooling
period, or components in the Electronic Control Module may fail.
4. Field Characteristics
Pulsing DC Field –
The Pulsed DC (125 Hz) Magnetic Field is stronger than
an AC Field and tends to penetrate the workpiece more deeply, however DC
is still sensitive to surface defects. Inspection media tends to adhere to the
entire target area of the workpiece, due to the reduced particle mobility. Dry
Particles may need to be ‘blown off’ to fully reveal an indication, while Wet
method requires more careful application of the bath. The intensity of a DC
Field, by it’s nature, is fixed but the Yoke does Pulse the field providing some
stimulus for the particles to migrate to defects.
