Defelsko POSITEST AT-A AUTOMATIC (Adhesion Tester) for NDT

Part #: NM01ATA

SKU: NM01ATA Category: Tags: , , ,


Measures the force required to pull a specified test diameter of coating away from its substrate using hydraulic pressure.



Electronically controlled hydraulic pump automatically applies smooth and continuous pull-off pressure. Greatly reduces user effort and the risk of influencing the pulling process
Impact and scratch resistant color touch screen with keypad for operation with or without gloves
Built-in rechargeable battery performs over 200 tests per charge. Continue testing with AC power while the battery recharges.
Environmentally sealed enclosure – weatherproof, dustproof and shockproof – meets or exceeds IP65
Rubberized, shock absorbing grips provide a stable, skid-resistant footing
Self-aligning aluminum dolly enables accurate measurements on smooth or uneven surfaces
10, 14, 20 or 50 mm dollies maximize capability and measurement resolution across a wide range of bond strengths. Maximum pull-off pressure by dolly size…
10 mm: 14000 psi (96 MPa)
14 mm: 7000 psi (50 MPa)
20 mm: 3500 psi (24 MPa)
50 mm: 560 psi (3.8 MPa)
User selectable measurement units: psi (pounds per square inch), MPa (Megapascal), Nmm2 (Newtons per millimeter square) or Newton (force)
User adjustable pull rate, pull limit and hold time
Rotating display for horizontal and vertical use
Pressure system is calibrated and certified to ± 1% accuracy using a NIST traceable load cell
Conforms to international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others

Memory and Reporting Features

Internal memory stores maximum pull-off pressure, rate of pull, test duration and dolly size for 100,000 pulls in up to 1,000 batches
Record the results as pass/fail and the nature of fracture – cohesive, adhesive and glue failures
Wirelessly connect to your smart device using our free PosiTector App (Apple iOS and Android)

Touch Screen Display
Use the touch screen to interact with menu options. Swipe horizontally to navigate between views or vertically to move between batch readings. Alternatively, the keypad can be used for navigation and selection.

– User adjustable dolly size, pull rate, pull limit and hold time.
– Batch summary provides an at-a-glance review of test results.
– View test parameters and reading results. Reading is recorded as pass or fail based on set test parameters. The pass/fail results can be revised.
– Notes can be added for each reading.
– Include a note for a batch (group) of readings.
– Record the nature of failure – cohesive, adhesive and glue failures.

Recording the Nature of the Fracture

Upon completion of a pull-off test, the dolly and coated surface should be examined. In addition to pull-off force, many National and International standards such as ASTM D4541 and ISO 4624 require the nature of the fracture to be recorded.

Cohesive fracture: fracture occurs within a coating layer (same coating on dolly face and coated surface).
Adhesive fracture: fracture occurs at the interface between layers (coating on dolly face differs from surface).
Glue failure: visible separation of the glue from itself, the coating or dolly (no coating visible on the dolly face).

The cohesive and adhesive fracture visual analysis can be recorded using the PosiTest AT-A’s keypad or touch screen display. Alternatively, the information can be reported using the PosiTector App.

Fractures are visually estimated and recorded as a percent of each. The two layer example below illustrates a cohesive fracture within coating layer 1 and layer 2 (visually estimated at 50% each). Recorded results are included in reports.

The PosiTest AT-A can record fracture information for up to five layers. For full details and examples see Visual Analysis and Recording of Test Results.



Model Selection

  • Two models available with either 20 mm or 50 mm dollies
 Order Code ATA20 ATA50
 Dolly size and stand off* 20 mm 50 mm
 Typical Applications Coatings on metal Coatings on concrete,
wood and plastic
 Range 0.7 – 24 MPa
100 – 3500 psi
100 – 7550 N
0.4 – 3.8 MPa
50 – 560 psi
100 – 7550 N
 Resolution 0.01 MPa (1 psi)
 Accuracy ±1% Full Scale
 Kits Include




ATA20: 20 mm dollies (20), 20 mm cutting tool and 20 mm stand off
ATA50: 50 mm dollies (8), 50 mm cutting tool and 50 mm stand off

Automatic Adhesion Tester, built-in rechargeable NiMH battery with charger, abrasive pad, glue with mixing sticks and palettes, cotton swabs, USB cable, PosiSoft Software, instruction booklet and video, Certificate of Calibration traceable to NIST, two-year warranty, and a sturdy, lightweight carrying case

*Optional 20 and 50 mm Accessory Kits allow each model to be used with alternative dolly sizes. Custom 10 and 14 mm dollies are available for special applications (compatible with 20 mm stand off).

Designed by Minima Studio



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