It is ideal for applications such as measuring the thickness of ship hull coatings and thick intumescent paints.
The probe is factory calibrated and right out of the box is ready to measure most coatings over 1018 steel substrates. Before measuring your application, it is good practice to verify probe accuracy by measuring a known thickness over your uncoated substrate.
The thickness of this 14 millimeter block is measured within tolerance when placed over uncoated 1018 steel but not when placed over a different cold rolled steel sample. This confirms an adjustment is required before coatings can be accurately measured over this sample.
Here’s how the 2 step Cal Adjustment process is performed. Power up the gage while ensuring the probe is held in the air away from any metal. The first step is to perform a Zero. Navigate to the Cal Settings menu option, then select Zero. Measure the uncoated part. Lift the probe to complete the zeroing process. Check that the probe now reads zero within tolerance.
The second and final step is to perform a 2 Point Cal Adjustment. Every PosiTector 6000 FNGS probe comes with a set of polystyrene blocks. Choose blocks or reference samples of known thickness that bracket your expected coating thickness range. In this example we expect to be measuring in the range of 20-40 millimeters, so we select a 13 millimeter block for our first point and stack 3 blocks together totaling 46 millimeters for our second point.
Press the Menu button, navigate to the Cal Settings menu option, then select 2 Pt. Adjust. Measure the thinner block placed over the uncoated part. Lift the probe. Adjust the displayed reading up or down to the known thickness of the block. Press the center button to accept this value. Measure the thicker set of blocks placed over the uncoated part. Lift the probe. Adjust the displayed reading up or down to the known thickness of the blocks. Press the center button to accept this value.
Check that the probe now measures these blocks or any other series of known thicknesses within tolerance. This adjustment applies to this particular substrate; therefore the probe will no longer accurately measure over the first substrate.
Advanced models of the PosiTector 6000 can store multiple cal adjustments for easy switching between applications.
Learn more @ defelsko.com/FNGS