DeFelsko PosiTector 200 Ultrasonic Coating Thickness Gage

Ultrasonic coating thickness on concrete, wood, plastic and composites

The DeFelsko PosiTector 200 measures coating thickness ultrasonically, so it works where magnetic and eddy current gages cannot: polymer coatings on wood and plastic, coatings on concrete and fiberglass, and thick soft coatings such as polyurea. The technique is non-destructive and the datasheet states conformity with ISO 2808 and ISO 19397 and ASTM D6132. Standard models measure the total thickness of a coating system. Advanced models can also report up to three individual layer thicknesses in a multi-layer system and show a graphics mode in which each layer interface appears as a peak.

Technical specifications

The gage body is 127 x 66 x 25.4 mm (5 x 2.6 x 1 in.) and weighs 137 g without batteries. It has a 2.8 in. colour touchscreen and an IP65-rated enclosure. The gage is supplied with ultrasonic gel, precision plastic shims, rubber holster, wrist strap, 3 AAA batteries, instructions, lens shield, carrying case, a long-form Certificate of Calibration traceable to NIST or PTB, USB cable, PosiSoft software and a two-year warranty on body and probe.

Standard and Advanced features

Standard models store 1,000 readings per probe. Advanced models store 250,000 readings in up to 1,000 batches and sub-batches, add live graphing, a touchscreen keyboard, WiFi synchronisation with PosiSoft.net and Bluetooth 4.0 for the PosiTector app. All models offer a statistics display, Max Thick mode, which shows the deepest ultrasonic echo so that unwanted surface echoes can be ignored without adjusting the low range, and the PosiSoft USB drive function that lets stored readings be read from any computer without software. The manufacturer lists complete gages for each probe in Standard and Advanced versions, and probe-only models for owners of an existing PosiTector body. Range limits apply to polymer-based coatings only. Ultrasonic readings need a film of couplant between probe and coating, and the ultrasonic gel supplied with the gage is intended for this.

Selection and ordering

Select the probe from the coating and substrate: 200B for thin polymer films on wood or plastic, 200C for typical coatings on concrete or glass-fibre laminate, and 200D for thick soft linings. Check that the substrate transmits sound well enough for the coating interface to return an echo, and that the expected layer thickness is above the probe minimum layer. If the same inspector also measures coatings on steel, the PosiTector body also accepts the PosiTector 6000 probes, which is described on the

DeFelsko PosiTector 6000.

How the DeFelsko PosiTector 200 works

The PosiTector 200 measures a coating with sound. The probe sends a short ultrasonic pulse into the coating through a layer of gel. Part of the pulse bounces back from the top of the coating and part from the boundary with the material underneath. The gage times the delay between these echoes and calculates the thickness from the speed of sound in the coating. Because no magnetism or electric current is needed, the method works on wood, plastic, concrete and fiberglass as well as metal.

Where the PosiTector 200 is used

• Polymer coatings on wood and plastic
• Coatings on concrete
• Coatings on fiberglass and composites
• Thick polyurea linings
• Multi-layer coating systems

Selection checklist for the PosiTector 200

• Probe 200B, 200C or 200D
• Substrate material
• Coating thickness range
• Minimum layer thickness
• Standard or Advanced model
• Single total thickness or layer by layer
• Data storage and WiFi needs
• Bluetooth app use

Installation, commissioning and maintenance notes for the PosiTector 200

Insert the batteries and attach the probe. Calibrate the gage on a known thickness, using the plastic shims supplied. Put a drop of gel on the surface, press the probe flat and read the value. Wipe the gel off after use, and keep the probe face clean and free of scratches.

Requesting a quotation for the DeFelsko PosiTector 200

Please send the probe, the substrate, the thickness range, the model level and the quantity. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.

PosiTector 200 probe ranges

Probe 200B reads 13 to 1,000 microns. Probe 200C reads 50 to 3,800 microns. Probe 200D reads 50 to 7,600 microns.

PosiTector 200 accuracy

Probes 200B and 200C are accurate to plus or minus 2 microns plus 3 percent of reading.

PosiTector 200 display and body

The body has a 2.8 inch colour touchscreen, an IP65 enclosure and a weight of 137 g without batteries.

PosiTector 200 memory

Standard models store 1,000 readings. Advanced models store 250,000 readings.

PosiTector 200 Max Thick mode

This mode shows the deepest echo so that surface echoes can be ignored.

Measurement records for the PosiTector 200

Keep the readings, the probe and the calibration certificate with each job.

Choosing the right PosiTector 200 probe

Choose the probe from the substrate and the expected coating thickness.

PosiTector 200 supplied items

The kit includes ultrasonic gel, plastic shims, a holster, a wrist strap, batteries and a carrying case.

PosiTector 200 standards

The data sheet cites ISO 2808, ISO 19397 and ASTM D6132.

PosiTector 200 layer mode

Advanced models can report up to three layer thicknesses in a multi-layer system.

Documents and quotation

The attached DeFelsko datasheet lists the models and probe-only codes. Please confirm before ordering the probe type, Standard or Advanced version, the substrate and the coating thickness range, and send them with your enquiry so the model code can be checked against the manufacturer documentation.