When attached to either a PosiTector Standard or Advanced body, the
PosiTector
6000
FNDS
probe measures the individual thicknesses of both the paint and the zinc layers
in a duplex coating system with a single reading.
Duplex coating systems use a combination of two corrosion protection systems –
typically paint or powder coating over galvanized steel (hot-dip, electro or zinc spray
metallizing). The resultant corrosion protection is superior to either protection system
used independently.
Duplex Mode
In Duplex mode, the Gage utilizes both magnetic (ferrous) and eddy current (non-
ferrous) principles simultaneously to calculate and display the individual paint and zinc
layer thicknesses. The magnetic principle is used to measure the combined paint/zinc
thickness over the ferrous substrate and the eddy current principle is used to measure
the paint thickness over the non-ferrous zinc coating. The zinc thickness is calculated
by subtracting the paint thickness from the combined paint/zinc thickness
measurement.
PosiTector
®
6000 FNDS
probe
for Duplex Coatings
Addendum to Instruction Manual v. 7
