Ultrasonic Wall Thickness & Concentricity Gauge

Ultrasonic Wall Thickness

Extrusion is a continuous manufacturing process for producing hoses, pipes and tubes. Molten or semi-molten materials — plastics (PVC, polyethylene, polypropylene), or elastomers – are forced through a die to form uniform, long profiles. Accurate control of wall thickness is essential. Variations lead to structural weaknesses, pressure failures, electrical breakdowns, leaks, or excess material consumption, increasing scrap and costs.

Ultrasonic wall thickness gauging provides a non-destructive, real-time, inline measurement solution using the pulse-echo principle. A high-frequency transducer (typically 2 to 20 MHz) emits acoustic pulses into the extruded product, usually with water from the post-extruder cooling bath acting as the coupling medium. The waves reflect from the outer surface and the inner surface. The system measures the time-of-flight (TOF) between these echoes.

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Specifications

InteliSENS TWT — Tube Wall Thickness · 4 probes · OD 1–32 mm

Model Part no. Layers Product OD Wall thickness
TWT4012-S 00073MC001 1 1 – 12 mm 0.12 – 2.5 mm
TWT4024-S 00073MC002 1 4 – 24 mm 0.12 – 2.5 or 0.25 – 6 mm
TWT4032-S 00073MC003 1 6 – 32 mm 0.25 – 6 mm
TWT4012-M 00073MC004 3 1 – 12 mm 0.12 – 2.5 mm
TWT4024-M 00073MC005 3 4 – 24 mm 0.12 – 2.5 or 0.25 – 6 mm
TWT4032-M 00073MC006 3 6 – 32 mm 0.25 – 6 mm

-S measures the total wall of a single-layer product. -M uses the same four probes to resolve up to three individual layer thicknesses in a coextruded product.

InteliSENS PWT — Pipe Wall Thickness · 4, 8 or 16 probes · OD 10–1600 mm

Model Part no. Probes Product OD Wall thickness
PWT4032 00073MC011 4 10 – 32 mm 0.25 – 6 mm
PWT4063 00073MC012 4 16 – 63 mm 0.25 – 6 mm
PWT40125 00073MC014 4 20 – 125 mm 0.5 – 12.7 mm
PWT40160 00073MC015 4 32 – 160 mm 1.27 – 20 mm
PWT80160 00073MC016 8 32 – 160 mm 1.27 – 20 mm
PWT40250 00073MC017 4 90 – 250 mm 1.27 – 20 mm
PWT80250 00073MC018 8 90 – 250 mm 1.27 – 20 mm
PWT40315 00073MC019 4 110 – 315 mm 2.5 – 50.8 mm
PWT80315 00073MC020 8 110 – 315 mm 2.5 – 50.8 mm
PWT40450 00073MC021 4 160 – 450 mm 2.5 – 50.8 mm
PWT80450 00073MC022 8 160 – 450 mm 2.5 – 50.8 mm
PWT40630 00073MC023 4 250 – 630 mm 7.5 – 127 mm
PWT80630 00073MC024 8 250 – 630 mm 7.5 – 127 mm
PWT40800 00073MC025 4 315 – 800 mm 7.5 – 127 mm
PWT80800 00073MC026 8 315 – 800 mm 7.5 – 127 mm
PWT801000 00073MC027 8 560 – 1000 mm 7.5 – 127 mm
PWT161000 00073MC028 16 560 – 1000 mm 7.5 – 127 mm
PWT801200 00073MC029 8 800 – 1200 mm 7.5 – 127 mm
PWT161200 00073MC030 16 800 – 1200 mm 7.5 – 127 mm
PWT801600 00073MC031 8 800 – 1600 mm 7.5 – 127 mm
PWT161600 00073MC032 16 800 – 1600 mm 7.5 – 127 mm

System specifications

Wall thickness accuracy ±0.01 mm (10 µm)
Wall thickness resolution 0.001 mm (1 µm)
Outer diameter accuracy ±0.02 mm (20 µm)
Ovality accuracy ±0.02 mm
Concentricity accuracy ±0.1 %
Layers 1 or 3 (TWT -S / -M)
Probes 4 (TWT) · 4, 8 or 16 (PWT, model dependent)
Probe protection IP68, fully immersed
Operating temperature +5 to +45 °C (41 to 113 °F)
Power supply 85 – 264 VAC, 50/60 Hz
Communications Ethernet, RS-232, RS-485, Modbus, OPC UA
HMI 15″ industrial touchscreen, fanless
Compliance CE (EMC 2014/30/EU, LVD 2014/35/EU) · EN 61326-1 · EN 61010-1 · ISO 9001:2015 manufacturer

Connectivity

1 x Ethernet port
Connect to PC, Network, PLC, Cloud Service
User selectable – Modbus TCP/IP or OPC-UA for Industry 4.0 solutions.

Ethernet, RS-232, RS-485, Modbus and OPC UA. No gateway required for OPC UA.

1 x iBUS Port
Connect to a PLC using PROFIBUS, PROFINET, EtherNet/IP [all included: select one to use].

1 x CANBUS Port
Proprietary CAN protocol to connect CDi4 display interface, including CS5G / via CS1000

1 x RS232 / RS422 / RS485
MODBUS RTU; PROTON ASCII code or Label; USB using RS232 – USB Converter Cable; RS485 MODBUS RTU; PROTON ASCII code (not available with PROFIBUS)

Two Ranges: Pipe vs. Tube

InteliSENS TWT

Tube Wall Thickness

Product OD 1 – 32 mm
Wall thickness 0.12 – 6 mm
Probes 4
Layers 1 or 3

Medical tubing, small hose, automotive fuel line, insulated wire and cable. Four probes measure a single-layer wall, or resolve up to three individual layers in a coextruded product.

InteliSENS PWT

Pipe Wall Thickness

Product OD 10 – 1600 mm
Wall thickness 0.25 – 127 mm
Probes 4, 8 or 16
Layers 1

PE, PP and PVC pressure and non-pressure pipe, large industrial hose and thick-walled profile. Probe count scales with diameter for circumferential resolution.

Where the two ranges overlap between 10 and 32 mm, choose TWT if you need individual layer thicknesses on a coextruded product, and PWT if you need a heavier-duty scanning box for a pipe line.

Measurement Parameters

Wall thickness

At every probe position around the circumference.

Minimum wall

The controlling value for standards compliance and material saving.

Outer diameter

Derived from opposing probe measurements.

Inner diameter

Derived from OD and wall thickness.

Concentricity

Wall distribution balance — how well centred the die is.

Ovality

Shape stability and process imbalance.