Page 25 - CFCM Nov-Dec-2020 Final_Neat

designed to be resistant to solvents, fecting the long-term performance of
acids, oil, water, and dust. coatings on steel structures, and Posi-
The PosiTest LPD and HHD units Tector meters can be used to monitor
can help ensure there are no defects environmental conditions before, dur-
or discontinuities present that expose ing and after painting. An electronic
the substrate, after a protective coating Dew Point Meter (DPM) determines
has been applied. Small areas of thin the likelihood of dew forming on struc-
or missing coating, known either as tures being painted.
“pinholes” or “holidays”, can become Additionally, the PosiTector IRT in-
foci for corrosion, and can seriously frared thermometer is a non-contact
reduce the life of a protective coating gauge that uses a button-activated laser
system. A holiday detector is a non- pointer for accurate targeting. It offers
destructive instrument used for detect- seven pre-set material options, and the
ing these discontinuities. user can select a custom emissivity
The low voltage (wet sponge) LPD value, or adjust to a known tempera-
are typically used on coating systems ture.
less than 500 µm (20 mils) thick. High The Statistics Scan mode on the in-
voltage spark testers, like the strument continually displays and up-
PosiTest HHD, operate at voltages up dates average or standard deviation,
to 35,000 volts and are typically used minimum-maximum surface tempera-
on coatings more than 500 µm (20 ture, and number of readings, while
mils) thick. measuring one reading per second.
Environmental conditions during Elcometer hails its model 311 Au-
DeFelsko’s PosiTector SPG measuring device. pre-treatment and application of a tomotive Paint Meter as being the
coating system are major factors af- fastest automotive paint gauge on the

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