Nitty-Gritty PASSI TEST Manuel D'utilisation page 13

6. HOW TO CHECK THE PASSIVATION OF STAINLESS STEEL
1. Connect the instrument to the external unit using the special cable supplied (Fig. 4).
2. Unscrew the tip protector and put it in the correct placement (Fig. 5).
NB: It is suggested to clean the area to be tested by any oily residue and / or dust, to prevent pollution of the tip
3. Place the pen tip on the point to be analyzed and the gold tip in contact with metal *
4. Keep the tip resting (avoiding sudden movements) for about 20 seconds (Fig. 6)
5. The displayed value is related to the passivation of the metal if the value is> 0, the metal is passivated, if the value is <0, the
steel is not passive.
NB: Typical values are +0.10 or higher for an AISI 304, for a carbon steel (not stainless) - 0.55
NOTICE: It is well known that where a welding process occurred the heat treatment altered the passivation of the stainless steel,
forming a layer of non protective oxides, slug and iridescence. It is not recommended to use the tester in this areas, without
prior cleaning, as they may cause false results due to the dielectric behaviour of the non protective oxides and slug, risking to
irreparably pollute the tip and therefore distort the subsequent readings.
Fig. 4
Fig. 5
Fig. 6
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