DeFelsko PosiTector PC Manuale utente

Introduction

The PosiTector®PC Powder Checker®is a hand-held, non-contact

Coating Thickness Gage that uses an airborne high frequency

ultrasound to analyze coating powder applied to rigid substrates to

calculate and display a predicted cured thickness.

The instrument consists of a base unit and a probe that communicate

with each other via Bluetooth wireless technology. They must stay

within 10 meters (30 feet) of each other while measuring. Arubber

holster with belt loop allows the base unit to stay with the operator while

measuring.

Note: Do not use compressed air on the probe. Tips for cleaning the

screen guard can be found on pg 15.

Note: Throughout this manual, the symbol indicates more

information about the particular topic or feature is available on our

website. Go to: www.defelsko.com/manuals

Power-up / Power-down

Step 1: Power-up the probe by pressing the button.

Step 2: Power-up the base unit by pressing any one of the 3 buttons. A

beep and a solid probe icon on the base unit indicates both units are

ready to measure.

To preserve battery life, both units power-down after approximately 5

minutes of inactivity. All settings are retained.

When a USB cable is connected to the base unit, power is supplied

through the USB cable. The batteries are not used and the base unit

will not automatically power down. The probe will still automatically

power down.

The base unit can be powered down at any time by holding down both

(-) and (+) buttons simultaneously for 5 seconds. The probe will also

power down.

Operation Overview

1. POWER UP both units.

2. ZERO the probe (see pg. 6)

3. ADJUST to the specific powder if necessary (see pg. 8)

4. MEASURE the applied powder (see below)

How to Measure

1. Power-up both units. Bring the probe to within 5 cm (2 inches) of the

coating powder.

2. Press and hold the button. Bring the probe closer to the powder.

While watching the probe display, align the Distance Paddle with the

Distance Target Bar. (see pg. 3)

3. While the probe button is depressed, probe distance and angle

should be varied slightly keeping:

(a) the Distance Paddle close to the Distance Target Bar, and

(b) the Amplitude Indicator at maximum height.

4. Release the button when you hear a double BEEP or see a

thickness measurement on either display.

Both units will power-down automatically after approximately 5 minutes

of inactivity.

Measurement Notes:

If a thickness result does not appear after 5 seconds, release the

measurement button and try again. Wait 1 to 2 seconds between

readings.

Small, erratically swinging parts may present measurement challenges.

Steady the part whenever possible.

If erroneous readings continually result, change the measurement

strategy by rotating the probe, altering its alignment to the part, or by

measuring a different location on the part.

For best results use Statistics mode (pg. 12) to generate averages.

The average of a series of measurements is often a more meaningful

prediction of cured thickness than a single reading.

Displays

Solid indicates good

wireless connection to

probe. Flashing

indicates no probe

connection.

Base Unit Display:

Last

Measurement

Current Calibration

Setting

Unit of

Measurement

Maximum Amplitude Dot

Probe Display (button not pressed):

Amplitude Indicator

Results Indicator Distance Target Bar

Probe Batteries Status (pg. 15)

Bluetooth Function Indicator

Predicted Cured Thickness Result

Distance Paddle

Predicted Cured

Thickness Result

Probe Display (button pressed):

Factory Calibration

Symbol (pg. 8)

Bluetooth Function Indicator: The symbol indicates the base unit

and wireless probe are communicating properly.

Results Indicator: When the probe is in the proper position and good

samples are being taken, a solid DOT blinks on the probe display, the

base unit LED blinks green and emits a high beep. When samples are

inconclusive, an "X" blinks on the probe display, the base unit LED

blinks red and emits a low beep.

Distance Paddle: Graphically represents the distance to the target. It

rises and falls to indicate distance from the probe tip to the surface of

the powder.

Distance Target Bar: The optimum distance for measurement is 18

mm (3/4 inch) between the tip of the probe and the surface of the

applied powder. During measurement, keep the Distance Paddle close

to the Distance Target Bar.

Amplitude Indicator: Strength of the ultrasonic echo. Ahigh position

indicates good probe orientation relative to perpendicular. The bar will

generally reach higher positions when measuring thin powder and when

the probe is at a 90-degree angle to the powder surface.

Maximum Amplitude Dot: Marks the highest position the Amplitude

Indicator reached during the current measurement attempt.

Predicted Cured Thickness Result: When a valid measurement is

calculated, the base unit BEEPS twice, the LED blinks green, and the

predicted cured measurement result is displayed on both the probe and

base unit. Continuing to hold the probe button will result in additional

samples being taken.

There are 4 types of displayed measurement results:

43 — Predicted thickness result.

0— The collected samples have resulted in a good reading, but the

resultant predicted cured thickness is less than the minimum range.

++ — The collected samples have resulted in a good reading, but the

resultant predicted cured thickness is greater than the maximum range.

- - — An indeterminate or invalid reading.

Menu Operation

Instrument functions on the base unit are menu controlled. To access

the full Menu, power-up both the probe and base unit. Then press the

(.:::.button. If the probe is not powered-up a condensed menu is

displayed.

Reset

Flip Display

Gage Info

Units

Set Clock

Language

USB Drive

Exit

Memory

Statistics*

Zero*

Cal Settings

Setup

Exit

* Appears when probe is ON

Current selection is displayed

with darkened background

To navigate, press (-) to scroll DOWN, (+) to scroll UP and (.:::.) to

SELECT. To exit any menu, press both (-) and (+) buttons

simultaneously or select Exit from the Menu.

List boxes have a down arrow on the right-hand side. Use the (-) or (+)

buttons until your desired choice appears, then press (.:::.) to select this

choice and move focus onto the next item.

A"tick" indicates this square

box has been selected

“List” box

Verification of Accuracy

Before first use on a new powder and periodically thereafter, the user

should perform an accuracy check. This ensures the gage is working

properly by comparing predicted thickness values with actual cured

thickness values.

1. Zero the probe (pg. 6).

2. Electrostatically spray powder onto a flat, smooth metal sample.

3. Measure the uncured powder with the PosiTector PC.

4. Cure the powder.

5. Measure cured thickness with a magnetic or eddy current coating

thickness gage such as the PosiTector 6000.Compare results.

Asuccessful verification requires that the average of a series of

measurements by both instruments be within their combined tolerances.

If not, adjust the PosiTector PC using one of the methods described on

page 8.

For best accuracy, perform a Zero at the beginning of every shift to

compensate for temperature and humidity changes. It is also required

after a Reset (pg. 13).

Zero Menu Option

1. Place the included Powder Probe Fixture onto a hard, flat,

smooth surface (i.e. glass or metal).

2. Place the measuring end of the probe into the Fixture.

3. Power-up both units.

4. On the base unit select the Zero

menu option. The zero process

can take up to 30 seconds.

Zero

Calibration and Adjustment

The PosiTector PC is factory calibrated and performs an automatic

self-check each time it calculates a measurement. For many powder

measurement applications no further adjustment is necessary. Simply

Zero at the beginning of each shift, then measure.

Sometimes gage measurement calculations can be influenced by the

composition of the coating powder. Acalibration adjustment improves

accuracy in these circumstances.

Adjustment, or Calibration Adjustment, is the act of aligning the gage's

predictions to match those of a known cured sample.

Begin by performing a Verification of Accuracy (pg. 6) to determine if

there is a need for an adjustment. If the average of several thickness

results is outside the combined tolerances of the two measuring

instruments (PosiTector PC and dry film thickness instrument) then 3

adjustment techniques are available to correct the variance.

User adjustments are stored in the current Cal setting. It may be

desirable to open a new Cal setting first (pg. 10).

Cal Settings

CAL

Cal Memory

1 Pt Adjust*

2 Pt Adjust*

Powder Comp*

Exit

* These menu options

appear only when the

probe is powered-up.

Factory Calibration Symbol

This symbol indicates the instrument is measuring with factory

calibration settings. It appears whenever a Reset (pg. 13) is

performed or whenever a new calibration setting (pg. 10) is

created. It disappears whenever a calibration adjustment is made (pg.

8) or when a user calibration is loaded from cal memory (pg. 10). A

probe Zero (pg. 6) does not change the status of the symbol.

Adjustment Techniques

To ensure the gage is working properly, the user should periodically

perform an accuracy check by comparing predicted thickness values

with actual cured thickness values (pg. 6).

If the average of a series of measurements by both instruments is not

within combined tolerances, the PosiTector PC can be adjusted using

one of three methods.

1) 1-point Adjustment - The first and most common choice.

2) 2-point Adjustment - If a 1 Pt Adjust does not improve accuracy.

3) Powder Compensation - If adjustments fail to improve accuracy.

1. Zero the probe (pg. 6).

2. Electrostatically spray approximately 75 microns (3 mils) of powder

onto a flat, smooth metal sample.

3. Open a New CAL setting (optional - pg. 10).

4. Select New Batch (pg. 11).

5. Take at least 3 uncured powder measurements with the PosiTector

PC. Results will be stored in the Batch.

6. Cure the powder.

7. Measure cured thickness with a magnetic or eddy current coating

thickness gage. Record the results.

8. Select "1 Pt Adjust" then select the batch name from Step 4 into

which the previous measurements had been placed.

9. Adjust the displayed batch average lower (-) or higher (+) to match

the cured thickness value.

1 Pt Adjust

1. Zero the probe (pg. 6).

2. Electrostatically spray powder onto 2 flat, smooth metal samples.

Place approximately 40 microns (1.5 mils) on one and 75 microns

(3 mils) on the other.

3. Open a New CAL setting (optional - pg. 10).

4. Select New Batch (pg. 11)

5. Take at least 3 uncured powder measurements on the thin powder

panel with the PosiTector PC. Results will be stored in the Batch.

6. Open a second new Batch.

7. Take at least 3 uncured powder measurements on the thick powder

panel with the PosiTector PC. Results will be stored in the

second Batch.

8. Cure the powder on both panels.

9. Measure cured thickness with a magnetic or eddy current coating

thickness gage. Record the results.

10. Select "2 Pt Adjust" then select the appropriate batch names

when asked.

11. Adjust the displayed batch averages lower (-) or higher (+) to match

the cured thickness values.

1. Zero the probe (pg. 6).

2. Electrostatically spray a thick layer of powder (135 microns / 5 mils)

onto a flat, smooth metal sample. Lay the panel on a table surface.

3. Place the included Powder Probe Fixture onto the coated panel.

4. Place the measuring end of the probe into the Fixture.

5. On the base unit select the "Powder Comp" menu option. This can

take up to 30 seconds.

6. A1- or 2-point adjustment may be required after this operation.

2 Pt Adjust

Powder Comp

Note: The symbol on the display will turn off after

the successful completion of an adjustment.

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