DeFelsko PosiTest HHD Addendum To Instruction Manual

Concrete Mode

Addendum to Instruction Manual v. 1

The conductivity of concrete is directly related to its moisture
content. To optimize the PosiTest HHD’s ability to detect
holidays in coatings applied over concrete, Concrete Mode

should be enabled. When concrete mode is enabled the

Sensitivity menu icon will appear. For most applications
the default sensitivity is appropriate.

Modifications to the ‘Quick Start’ (p. 5)

procedure when Measuring on Concrete

• Attach the PosiTest HHD ground cable to exposed rebar, pipe of other metal

structure embedded in the concrete. Alternatively, the ground cable can be
placed on top of an area of uncoated concrete using damp sandbags.

• Ensure Concrete Mode is enabled from the PosiTest HHD Menu. The
Concrete Mode icon will appear on the

• Ensure that the electrode is in contact with the coating in an area with no

holidays before activating the high voltage output. In concrete mode, the

PosiTest HHD only regulates the output voltage for the first half-second after

the high voltage output has been activated. If, while testing, the displayed test
voltage decreases due to changes in concrete moisture, simply deactivate and

ctivate the high voltage output while keeping the electrode in contact with

rea

the coating.

NOTE:

contact with the coating or if a holiday is present, a voltage drop may be noticed
when the electrode is placed on the coating.

• For best operation, verify that the Sensitivity is set correctly. Find a

NOTE:

the sensitivity is set to default.

• To turn off Concrete Mode, select from the PosiTest HHD Menu.

If the high voltage output is activated while the electrode is not in

known holiday in the coating or prepare a shim of the same thickness as the
coating over the bare concrete with a 1mm diameter hole drilled in the center.
Ensure that the PosiTest HHD detects the holiday or hole in the shim. If the

sensitivity is too high (slider too far to the right) the instrument may alarm when

ay is present. If the sensitivity is too low (slider too far to the left) the

no holid

instrument may fail to alarm when a holiday is present.

The sensitivity setting is retained during power cycles. After a Reset

display.

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