Spraying The Workpiece - Magnaflux Universal SW Series Operating Manual

Electronic demagnetising works according to the
following principle:
• The workpiece is magnetised with the set magnet-
ising current during the magnetising cycle.
• After rinsing and demagnetisation, the magnetising
current is gradually reduced along an e-function
until it is zero.
Development of the magnetising current during the
demagnetising process

2.8 SPRAYING THE WORKPIECE

Test liquid
NOTE: The correct concentration of test liquid makes
a decisive contribution to the reliable detection of
cracks and flaws. Please note the manufacturer's
instructions for the mixing ratio.
The test liquid is a suspension of magnetic powder
and a carrier medium, such as water or oil. The mag-
netic powder often has fluorescent dye added to it,
which makes the accumulation of test liquid in cracks
more clearly visible under UV lighting.
The test liquid must be applied evenly to the work-
piece in sufficient quantity. For this reason, you must:
• ensure the correct mixing ratio of magnetic powder
and carrier medium
• mix the suspension thoroughly,
• replace the suspension when it gets contaminated.
Spraying with a hand-held hose
You can spray the workpiece [3] with test liquid using
a hand-held hose [1]. Use the stop-cock [2] to adjust
the flow of test liquid and to turn off the supply of test
liquid to the hose.
You can also use the hand-held hose to conveniently
clean the machine. Thoroughly spray out the working
area inside the test equipment drip tray before chang-
ing any test equipment.
OPTION: The hand-held shower spray system has an
integrated push-button to activate the magnetising
current and the test liquid spraying at the same time.
1. push-button to activate magnetisation
2. hand spray system
Spraying with ring shower
During coil magnetisation, the ring shower [1] [2] rinses
the workpiece [4] with test liquid. The ring shower is
mounted at the magnetising coil [3]. Two stop-cocks
{5} & [6] are mounted at the back of the ring shower;
use these to adjust and turn off the flow of test liquid.
1. Upper half of the ring shower
2. Lower half of the ring shower
3. Magnetising coil
4. Workpiece
5. Stop-cock for the upper half of the ring shower
6. Stop-cock for the lower half of the ring shower
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