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Overview

39DL PLUS™ Ultrasonic Thickness Gauge

Faster Thickness Results

Streamline your ultrasonic thickness inspection process with one fast, connected, and reliable handheld gauge. The 39DL PLUS™ gauge works as a precision or corrosion thickness gauge for demanding applications.

With world-class ultrasonic capability, fast scanning speeds up to a 60 Hz update rate, and fully integrated wireless connectivity, our flagship handheld thickness gauge delivers results you can trust in a seamless workflow.

Connected: Integrated Wi-Fi®, Bluetooth®, USB, RS-232, and a removable microSD card*
Fast: Scan for minimal thickness areas at a 2 times faster display update rate**
Versatile: Tackle multiple thickness applications with our full line of dual and single element transducers

*Wi-Fi^® and Bluetooth^® are pending certification in some regions. Contact your local Evident representative for details on their availability.
**Up to 60 Hz versus 30 Hz on the predecessor model and comparable handheld thickness gauges.

UT thickness gauge for measuring corrosion of pipes

Affordable Part Scanning

With breakthrough scanning speeds, the 39DL PLUS instrument offers an industry-leading* 60 Hz update rate for handheld thickness gauges.

Works as an affordable alternative for inspection codes that require a 60 Hz display update rate for scanning; get the scanning speed of a flaw detector with the ease of use of a thickness gauge
Find thin spots more easily when scanning for minimal thickness areas on pipes and other assets affected by corrosion

*As of June 2024.

One Thickness Gauge for Multiple Applications

Take advantage of powerful measurement features and a suite of application-specific software options for your current and future requirements.

Wide thickness range: 0.08 mm (0.003 in.) to 635 mm (25 in.) depending on material and transducer selection
Corrosion thickness gauging with dual element transducers
High Resolution software option of 0.001 mm or 0.0001 in. with single element transducers from 2.25 MHz to 30 MHz
THRU-COAT™ technology and echo-to-echo measurements to measure through painted and coated surfaces
Internal Oxide/Scale software option for boiler tube and internal oxide measurements
Multilayer software option to measure up to four layers simultaneously
High Penetration software option for attenuating materials such as fiberglass, rubber, and thick castings

Standard resolution: 0.01 mm or 0.001 in. for all transducers
Thickness, velocity, and time-of-flight measurements
Differential mode and reduction rate mode to track thickness variation and its percentage from a preset value
Time-based B-scan mode: 10,000 reviewable readings per scan
High Dynamic Gain technology with digital filters optimizes the starting gain setting based on calibration
V-Path Builder for custom V-path compensation in corrosion applications
Designed for EN15317 compliance
Compatible with all probes and accessories supported on the predecessor model

Key Benefits

Trusted Ultrasonic Technology

The 39DL PLUS™ gauge builds on proven performance. Confidently perform your work with industry standard technology for ultrasonic thickness testing.

Accurate, reproducible measurements from exceptional signal quality, stable waveforms, and optimized algorithms
World-class ultrasonics developed by professionals with 35+ years of nondestructive testing (NDT) experience

Rugged ultrasonic thickness gauge

Built to Last in Any Environment

Your thickness gauge needs to keep working despite shocks, drops, and rough handling, and the 39DL PLUS instrument is up to the challenge.

Rugged: Designed for IP67 for protection against dust and water
Explosive atmosphere, shock, and vibration tested using MIL-STD-810H
Wide operating temperature range: –10 °C to 50 °C (14 °F to 122 °F)
Protective rubber boot with gauge stand

Easy to Carry, Easy to Use

Designed with the operator in mind, the 39DL PLUS handheld gauge is comfortable to carry and use in the field or on the production floor.

Ergonomic keypad: operate with the left or right hand for quick access to all functions
Lightweight handheld design: Weighs only 0.83 kg (1.83 lb)
Built-in data logger: Easily collect thickness readings and waveform data
Efficient inspections: Default and custom setups for dual and single element transducers
Secure access control: Lock instrument features with password-protected functions
Excellent clarity: Color transflective VGA display with indoor and outdoor color settings
See work on a larger screen: VGA output to connect the gauge to a computer or monitor

Thickness test in an outdoor display

Outdoor display setting, A-scan mode

Thickness test in an indoor display

Indoor display setting, B-scan mode

Workflow

Save Time with a Digital Inspection Workflow

Integrated Wi-Fi^® and Bluetooth^® capabilities on the 39DL PLUS™ thickness gauge enable a seamless inspection workflow for Industry 4.0.

Wirelessly connect to the Link Plus iOS app, Link-Wedge software, or the Inspection Project Manager (IPM) app to effortlessly share results
Use GageView™ software for the flexibility to review data with a wired connection

Powerful Workflow Management Tools

The Inspection Project Manager (IPM) is a cloud-based web and mobile app offering a digital inspection workflow that improves efficiency and data integrity.

Use the iOS or Android mobile app with or without an internet connection to efficiently execute inspection tasks
Collect inspection data and digitally sign off on inspection tasks in an intuitive interface
The digital report automatically updates throughout your inspection

Send Thickness Data to Your Mobile Phone or Tablet

Use the Link Plus iOS app and Bluetooth® to send thickness data to your phone or tablet.

From your mobile device, share thickness data over text message or email, or save the data as a text file for easy import to a spreadsheet
You can also send data to compatible third-party mobile applications

Easily Populate Your Thickness Data into Data Entry Programs

Use the optional Link-Wedge software and Bluetooth® to send data from your gauge to an active Windows software application. The software can populate data into almost any Windows-based data entry program.

Remote Control and Integration

The 39DL PLUS gauge offers the potential for remote control and integration, enabling convenient control of the gauge from a distance in innovative applications. To learn more about these capabilities, reach out to your local Evident sales representative.

Ultrasonic thickness measurement tool

Confidence in Your Thickness Data

Built-In Data Logger

Improve productivity and data traceability with the full-featured, built-in data logger on the 39DL PLUS gauge. The bidirectional alphanumeric data logger is designed to easily collect and transfer thickness readings and waveform data.

Log data

Internal memory of 792,832 thickness readings or 20,000 waveforms with thickness readings
32-character file name
9 file formats: incremental, sequential, sequential with custom point, 2D grid, 2D grid with custom point, 3D grid, 3D custom, boiler, and manual
20-character ID# (thickness measurement location or TML#)
- Store up to 4 notes per ID#
- Store notes at one or more ID#s

Analyze data

Onboard statistical report
Assess readings at a glance: Onboard DB Grid View with three programmable colors set to specific thickness values

Transfer data

Wirelessly share data: integrated Wi-Fi® and Bluetooth®
Wired data transfer: USB and RS-232 communication ports
Two-way transfer of single and dual element transducer setups
Copy files between internal/external microSD™ memory cards; directly export internal files to a microSD card in an Excel-compatible CSV format

PC Software

The GageView™ interface program, a Windows-based application, collects, creates, prints, and manages data from the 39DL PLUS gauge. The software communicates with the gauge using the USB and RS-232 ports, and it can read and write to a microSD memory card.

Create datasets and surveys
Edit stored data
View dataset and survey files, including thickness readings, gauge setup values, and transducer setup values
Download and upload thickness surveys to and from the gauge
Export surveys to spreadsheets and other programs

Collect snapshot screens
Print reports such as thickness, setup table, statistics, and color grid
Upgrade the operating software
Download and upload single and dual element transducer setup files
B-scan review

PC software for portable ultrasonic thickness gauges

The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Evident Corporation is under license.

Applications

The 39DL PLUS™ instrument works as a precision or corrosion thickness gauge in a variety of inspections. Explore the applications below to discover common inspections, related software features, and a full line of compatible transducers.

39DL PLUS for Precision Thickness

39DL PLUS for Corrosion Inspection

UT measurement of plastic

Thickness Measurements on Plastics, Metals, Composites, Glass, Rubber, and Ceramics

Use single element transducers with the 39DL PLUS gauge to make accurate thickness measurements on metals, plastics, composites, glass, ceramics, and other materials. These transducers are available in a wide range of frequencies, diameters, and connector styles.

Versatile measurements: Take thickness, velocity, or time-of-flight measurements.
Standard resolution of 0.01 mm (0.001 in.) for all transducers.
High Resolution software option: Make very precise measurements at a resolution of 0.0001 in. or 0.001 mm for single element transducers from 2.25 MHz to 30 MHz.
Application auto-recall: Simplify thickness measurements with default and custom setups

High Penetration software option: Measure thick or sound attenuating materials, such as rubber, fiberglass, castings, and composites, using low-frequency single element transducers (low as 0.5 MHz).
Multilayer software option: Calculates and simultaneously displays thickness measurements of up to four individual layers. It can also display the total thickness of selected layers.
Differential and reduction rate modes: Differential mode shows the thickness variation from a preset thickness value. Reduction rate mode displays the percentage of that thickness variation.

Transducers for Precision Thickness Gauges

Evident offers a complete selection of single-element transducers, cables, couplants, calibration test blocks, and accessories to meet a wide variety of precision thickness gauging applications.

Metal thickness gauge

Thickness Measurements on Internally Corroded Metals

Use the 39DL PLUS gauge to measure the remaining thickness of pipes, tubes, tanks, pressure vessels, hulls, and other structures affected by corrosion or erosion. Dual element transducers are commonly used for these applications.

Automatic probe recognition: Automatically recalls a default V-path correction for each specific transducer. Available for all standard dual element transducers (including the D79X series).
Easier application setup with 10 custom transducer setups for dual element transducers.
High Dynamic Gain technology with digital filters optimizes the starting gain setting based on calibration for dual element transducers
V-Path Builder: Build a custom V-path compensation curve for almost any dual element transducer. You can save and recall these curves along with custom setups for most dual element transducers.
High-temperature measurements up to 500 °C (932 °F)
Temperature compensation: For more accurate measurements in varying temperatures, manually enter the calibration block’s temperature and the current (high) temperature at the measurement points. The gauge automatically displays the temperature-corrected thickness.
Encoded B-scan option: Connect the gauge to a linear encoded scanner to generate encoded B-scans. The gauge captures and stores the distance traveled information with corresponding thickness readings and the waveform at the minimum thickness location. You can select the distance between measurements and between bidirectional and unidirectional modes. Store up to 10,000 thickness readings in a single B-scan.

Calibration doubling warning in case echo doubling occurs during calibration.
THRU-COAT™ technology and echo-to-echo measurements on painted and coated surfaces. The THRU-COAT feature measures true metal thickness. It can also display the metal and coating thicknesses, each adjusted for their correct material sound velocities. THRU-COAT measurements use D7906- SM, D7906-RM, and D7908 dual element transducers.
Oxide/scale measurement option: Measures the thickness of oxide/scale buildups inside boiler tubes with M2017 or M2091 single element transducers so you can estimate tube life. Gauge simultaneously displays the boiler tube’s metal thickness and the oxide layer’s thickness.
No-couplant measurements of boiler tubes with external oxide/scale buildup using the EMAT E110-SB transducer.

Transducers for Corrosion Thickness Gauges

Evident offers a complete selection of dual element transducers and cables to meet a wide variety of corrosion thickness gauging applications.

Specifications

39DL PLUS™ Specifications

Measurements > Dual element transducer measurement mode	Time interval from a precision delay after the excitation pulse to the first echo
Measurements > THRU-COAT™ measurement	Measurement of true metal and coating thicknesses with a single back-wall echo (with D7906-SM and D7908 transducers)
Measurements > Thru-Paint Echo-to-Echo	Time interval between two successive back-wall echoes to eliminate paint or coating thickness
Measurements > Single element transducer measurement modes	Mode 1: Time interval between the excitation pulse and the first back-wall echo Mode 2: Time interval between the delay line echo and the first back-wall echo (with delay or immersion transducers) Mode 3: Time interval between successive back-wall echoes following the first interface echo after the excitation pulse (with delay line or immersion transducers) Oxide: optional Multilayer mode: optional
Measurements > Thickness range	0.08 mm to 635 mm (0.003 in. to 25 in.) depending on material, transducer surface conditions, temperature, and selected configuration
Measurements > Material velocity range	0.508 mm/μs to 13.998 mm/μs (0.02 in./μs to 0.551 in./μs)
Measurements > Resolution (selectable)	Low: 0.1 mm (0.01 in.) Standard: 0.01 mm (0.001 in.) High Resolution (optional): 0.001 mm (0.0001 in.)
Measurements > Transducer frequency range	Standard: 2.0 MHz to 30 MHz (-3 dB) High Penetration (optional): 0.50 MHz to 30 MHz (-3 dB)
General > Operating temperature range	-10 °C to 50 °C (14 °F to 122 °F)
General > Keypad	Sealed, color-coded keypad with tactile and audible feedback
General > Case	Impact-resistant and water-resistant, gasketed case with sealed connectors. Designed for IP67.
General > Dimensions (W x H x D)	Overall: 125 mm × 211 mm × 46 mm (4.92 in. × 8.31 in. × 1.82 in.)
General > Weight	0.83 kg (1.83 lb)
General > Power supply	AC/DC adapter, 24 V; lithium-ion battery 23.760 Wh; or 4 AA auxiliary batteries
General > Battery life, lithium-ion	Operating time: typically 8 hours Fast charge: 2 to 3 hours
General > Standards	Designed for EN15317
General > Explosive Atmosphere	Testing using MIL-STD-810H, Section 511.7, Procedure I
Display > Color transflective VGA display	Liquid crystal display, display area 56.16 mm x 74.88 mm (2.2 in. x 2.95 in.)
Display > Rectification	Full wave, RF, half-wave positive, or half-wave negative
Inputs/Outputs > USB	USB 3.0
Inputs/Outputs > RS-232	Yes
Inputs/Outputs > Memory card	Maximum capacity: 32 GB external microSD memory card
Inputs/Outputs > Video output	VGA output standard
Wireless Communication > Wi-Fi®	Integrated
Wireless Communication > Bluetooth®	Integrated
Internal Data logger > Data logger	The 39DL PLUS identifies, stores, recalls, clears, and transmits thickness readings, waveform images, and gauge configuration information through the standard RS-232 serial port or USB port
Internal Data logger > Capacity	792,832 thickness measurements or 20,000 waveforms with thickness measurements
Internal Data logger > File names, IDs, and comments	32-character file names and 20-character alphanumeric location codes with four comments per location
Internal Data logger > File structures	Nine standard or custom application-specific file structures
Internal Data logger > Reports	On-gauge reporting of summary with statistics, Min./Max. with locations, Min. review, file comparison, and alarm report

Standard Package

39DL PLUS digital ultrasonic thickness gauge, AC or battery, 50 Hz to 60 Hz. Kits available with standard dual element transducers.*

Charger/AC adapter (100 VAC, 115 VAC, 230 VAC)
Internal data logger
GageView interface program
Test block* and couplant
USB cable
Rubber protective boot with gauge stand and neck strap
User's manual
Two-year limited warranty

Measurement features: THRU-COAT, Thru-Paint Echo-to-Echo, EMAT compatibility, Min./Max. mode, two alarm modes, differential mode, B-scan, Application Auto-Recall, temperature compensation, Average/Min. mode

*In the EMEA region, transducers are not included and must be purchased separately.

Software Options

39DLP-OXIDE (Q1470008): Code-activated Internal Oxide measurement software
39DLP-HR (Q1470006): Code-activated High Resolution measurement software
39DLP-MM (Q1470007): Code-activated Multilayer measurement software
39DLP-HP (Q1470005): Code-activated High Penetration (low frequency) measurement software
39DLP-EBSCAN (Q1470004): Encoded B-scan software

Optional Accessories

1/2XA/E110 (U8767104): Filter adapter for E110-SB EMAT transducer
38-9F6 (U8840167): RS-232 cable
38-C-USB-IP67 (U8800998): USB cable for IP67 sealed operation
38DLP/RFS (U8780288): Foot switch, factory installed
HPV/C (U8780124): Digital caliper for thickness input for velocity measurements
38DLP-V-CC (U8840172): Cable for digital caliper
EPLTC-C-VGA-6 (U8840035): VGA output cable
MICROSD-ADP-2GB (U8779307): 2 GB external microSD memory card (gauge can use up to a 32 GB microSD card)
BSCAN-ENC (U8779522): Encoded B-scan buggy
38DL-ENC-CBC-10 (U8840168): 10 ft encoder cable