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72DL PLUS Thickness Gauge

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72DL PLUS™ Ultrasonic Thickness Gauge

High-Speed, High-Frequency, High-Precision Measurements
mil thickness gauge


The Olympus 72DL PLUS™ ultrasonic thickness gauge delivers precision thickness measurements at high speed in a portable, easy-to-use device. With fast scanning, advanced algorithms, and our lowest-ever minimum thickness capability, you can confidently measure the thickness of very thin layers in the most challenging applications.

72DL PLUS thickness gauges are available in Standard Frequency and High-Frequency models. The High-Frequency model can measure ultra-thin materials, including multilayer paint, plastics, metals, and coatings, and the Multilayer Measurement Software can simultaneously display the thickness of up to six independent layers. All 72DL PLUS models have the features to perform fast, accurate thickness measurements:

  • Digital filters enable an excellent signal-to-noise ratio to accurately measure noisy materials (e.g., fiberglass)
  • High-resolution touch screen is easy to use and see from various angles
  • PC Interface Application integrates your workflow, inspection management, alerts, and data analysis

72DL PLUS Features at a Glance

Ultrasonic thickness gauge for thin materials

  • Rugged: designed for IP65
  • Large, clear screen: 177.8 mm (7 in.) high-resolution touch screen WVGA display
  • Versatile layouts: A-Scan, B-Scan, A/B-Scan, Trend, and Zoom measurement layouts provide an accurate picture of thickness changes
  • Customizable: Standard Frequency model and High frequency model with Multilayer Measurement software to simultaneously measure thickness of up to 6 layers
  • Guided Inspection: Interactive part map with thickness measurement locations (TMLs) show a quick view of the inspection status and quality
  • Long battery life: up to 8 continuous hours
  • Efficient data management: internal data logging and PC Interface Application speed up data collection and review
  • Connected: supports wireless LAN
  • Cloud enabled: wireless connection to the Olympus Scientific Cloud™ (OSC) and compatible OSC apps
  • Easy application setup: create custom applications to reduce device setup time for routine inspections

Intuitive User Interface with an Easy-to-View, Large Screen

  • Wide viewing angle for outstanding visibility in most ambient conditions
  • 177.8 mm (7 in.), full color touch screen provides access to the setup and measurement layouts
  • Guided configuration makes it easy to change the settings based on your needs

An Ultrasonic Thickness Gauge Built for Industrial Environments

  • Designed for IP65 to protect against dust and moisture
  • Drop tested (MIL-STD-810G) to protect against falls and reduce the need for costly repairs
  • Takes reliable measurements in a wide operating temperature range of –10°C to 50°C (14°F to 122°F)
  • Portable for the production floor, weighing 2.1 kg (4.6 lb)
  • Easy to control from the touch screen, key controls, and adjustment knob
  • Can be used indoors and outdoors, on a work surface, or using a four-point chest harness or shoulder strap

Paint thickness gauge

Measure the Thickness of Up to Six Layers for Multilayer Coatings, Paint, Plastics, and Other Materials

The Multilayer Measurement Software offers multilayer thickness measurements of up to six layers. Measurement settings for each layer—including material, velocity, target thickness ranges, and alarm thresholds—are easily accessible through the configuration workflow and touch-screen controls.

72DL PLUS™ Specifications

Standard Frequency High Frequency
Overall Dimensions (W × H × D) 238.76 × 172.72 × 86.36 mm (9.4 × 6.8 × 3.4 in.)
Weight 2.08 kg (4.6 lb)
Power Supply AC/DC adapter 24 V, or lithium-ion battery 73 Wh
Battery Life 8 hrs
Battery Storage Temperature -20°C to 40°C (-4°F to 104°F)
Operating Temperature -10°C to 50°C (14°F to 122°F)
Display 177.8 mm (7 in.) WVGA (800 × 480) PCAP touch, refresh rate 60 Hz
Resolution LOW: 0.1 mm (0.01 in.) LOW: 25 μm (1 mil=0.001 in.)
STD: 0.01 mm (0.001 in.) STD: 2.5 μm (0.1 mil=.0.0001 in.)
HI: 0.001 mm (0.0001 in.) HI: 0.25 μm (0.01 mil=0.00001 in.)
Thickness Range (dependent on probe frequency, probe type, and material) Steel 0.20 mm to 635 mm (0.008–25 in.) Plastic 0.0127 mm to 25.4 mm (0.0005 in - 1 in)
Multilayer Measurements Up to 6 layers
Measurement Rates 1–3 layers 2 kHz max 1–3 layers 1 kHz max
4–6 layers 1 kHz max 4–6 layers 500 Hz max
Calibration Single- or two-point automatic calibration; zero offset and/or velocity manual adjustment; single-point calibration from frozen waveform
Display Layouts A-Scan, B-Scan, A/B-Scan, Trend, Zoom, Template, and A-Scan/Template
Capacity 2 GB; ~400,000 thickness readings, 20,000 waveforms
Frequency Range 0.2–30 MHz (-3 dB) 20–125 MHz (-3 dB)
Gain Automatic or Manual (max 100 dB) Automatic or Manual (max 80 dB)
IP Rating Designed and tested for IP65: protected against dust and water jets from all directions
Explosive Atmosphere MIL-STD-810F, Method 511.4, Procedure I
Shock Tested MIL-STD-810F, Method 516.5, Procedure I, 6 cycles each axis, 15 g, 11 ms half sine
Vibration Tested MIL-STD-810F, Method 514.5, Procedure I, Annex C, Figure 6, general exposure: 1 hour each axis


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