Olympus 38dl Plus





38DL PLUS® Ultrasonic Thickness Gauge:
Advanced Features, Simple Operation, Rugged, Reliable

The 38DL PLUS is an innovative instrument that signals a new era in ultrasonic thickness gauging. Ideally suited for almost every ultrasonic thickness application, this handheld thickness gauge is fully compatible with a full line of dual and single element transducers. The versatile 38DL PLUS can be used in applications ranging from wall thinning measurements of internally corroded pipes with dual element probes to very precise thickness measurements of thin or multilayer materials with single element transducers.

The 38DL PLUS comes standard with many powerful but easy-to-use measurement features and a host of application-specific software options. Its sealed case is designed to meet IP67 requirements to withstand the rigors of very wet or dusty environments. The color transflective VGA display provides superior readability from bright sunlight to complete darkness. It features a simple, ergonomic keypad that can be operated with the left or right hand for easy access to all functions.

Key Features

  • Dual and single element transducer compatibility
  • Wide thickness range: 0.08 mm (0.003 in.) to 635 mm (25 in.) depending on material and transducer selection
  • Corrosion thickness gaging with dual element transducers
  • THRU-COAT® and Echo-to-Echo measurements on painted and coated surfaces
  • Internal Oxide/Scale software option
  • Standard resolution of 0.01 mm or 0.001 in. for all transducers
  • High Resolution software option of 0.001 mm or 0.0001 in. with single element transducers 2.25 MHz to 30 MHz
  • Multilayer software option for measurements of up to four layers simultaneously
  • High Penetration software option for attenuating materials such as fiberglass, rubber and thick casting
  • Thickness, Velocity, and time-of-flight measurements
  • Differential mode and Reduction Rate mode
  • Time-based B-scan mode; 10,000 reviewable readings per scan
  • Olympus High Dynamic Gain technology with digital filters
  • V-Path Builder for custom V-path compensation
  • Designed for EN15317

What Makes This Thickness Gauge Different From Others?

The 38DL PLUS is designed to meet the challenges of demanding applications and built to withstand tough conditions in the field and on the production floor. Whether you work in very wet or dusty conditions, cold or hot climates, or bright or dark areas, the 38DL PLUS can handle any inspection job. Need an instrument tough enough to tolerate shocks, drops, and rough handling? The 38DL PLUS with its protective rubber boot and designed for IP67 rating is your answer.

Built for Tough Environments
  • Compact, weighs only 0.814 kg (1.80 lb)
  • Rugged, designed for IP67
  • Explosive Atmosphere: Safe operation as defined by Class I, Division 2, Group D, as found in the National Fire Protection Association Code (NFPA 70), Article 500, and tested using MIL-STD-810F, Method 511.4, Procedure I.
  • Shock tested using MIL-STD-810F, Method 516.5, Procedure I, 6 cycles each axis, 15 g, 11 msec Half sine.
  • Vibration tested using MIL-STD-810F, Method 514.5, Procedure I, Annex C, Figure 6, general exposure: 1 hour each axis.
  • Wide operating temperature range
  • Protective rubber boot with gauge stand
  • Color transflective VGA display with indoor and outdoor color settings for superior clarity
38DL PLUS Thickness Gage

Designed for Easy Operation

  • Simple keypad for right hand/left hand operation
  • Easy operator interface with direct access to all functions
  • Internal and External MicroSD memory card storage
  • USB and RS-232 communication ports
  • Alphanumeric data logger with 475,000 thickness readings or 20,000 waveforms
  • VGA output to connect to computer or monitor
  • Default/Custom dual element transducer setups
  • Default/Custom single element transducer setups
  • Password protected function allows locking of instrument features

Outdoor display setting, A-scan mode

Indoor display setting, B-scan mode

38-Link Wireless Communication Adaptor
The optional 38-Link wireless adaptor enables any existing 38DL PLUS thickness gauge to send and receive data using Bluetooth® or wireless LAN*.

The 38-Link adaptor provides three powerful wireless communication capabilities:

  • Wireless communication to the Olympus Scientific Cloud™ (OSC) and the Inspection Project Manager (IPM) app, which allows you to more effectively manage your inspections and much more
  • Bluetooth communication to the Olympus Link mobile app or other compatible third-party applications
  • Bluetooth communication to the optional Link-Wedge software to directly send thickness readings into an active Windows® program on your Windows 10 PC


For more details, see the 38-Link page, or download the 38-Link brochure.

*Wireless LAN and Bluetooth dongle availability depends on your region. Contact your local Olympus sales representative for more information.

Data Logger and PC Interface
The 38DL PLUS has a full-featured internal bidirectional alphanumeric data logger that is designed to easily collect and transfer thickness readings and waveform data.

  • Internal memory of 475,000 thickness readings or 20,000 waveforms with thickness readings
  • 32 Character File name
  • 20 Character ID# (TML#)
  • 9 file formats: Incremental, Sequential, Sequential with custom point, 2-D Grid, 2-D Grid with custom point, 3-D Grid, 3-D custom, Boiler, and Manual
  • The ability to store up to 4 comments (notes) per ID# (TML)
  • Stores comments (notes) at an ID# or to a Range of ID#’s
  • Internal and External MicroSD memory cards
  • File copy with the ability to copy files between Internal/External MicroSD memory cards
  • Standard USB and RS-232 communication
  • Two-way transfer of both single and dual element transducer setups
  • Onboard statistical report
  • Onboard DB Grid View with three programmable colors
  • GageView™ interface program can communicate with the 38DL PLUS using the USB, RS-232 ports, and can read and write to a MicroSD memory card.
  • Direct export of internal files to MicroSD memory card in Excel compatible CSV (comma-separated values) format
38DL PLUS Ultrasonic Thickness Gage side view

  • The GageView interface program, a Windows-based application, collects, creates, prints, and manages data from the 38DL PLUS.
  • Creates datasets and surveys
  • Stored data editing
  • View dataset and survey files; including thickness readings, gauge setup values, and transducer setup values
  • Download and upload thickness surveys to and from the gauges
  • Export surveys to spreadsheets and other programs
  • Collecting snapshot screens
  • Printing reports such as Thickness, Setup Table, Statistics, and Color Grid
  • Upgrading operating software
  • Download and upload single and dual element transducer setup files
  • B-scan review

Onboard DB Grid View with three programmable colors

Standard Package
38DL 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
Measurements Dual element transducer measurement mode Time interval from a precision delay after the excitation pulse to the first echo
THRU-COAT® measurement Measurement of true metal and coating thicknesses with a single back-wall echo (with D7906-SM and D7908 transducers)
Thru-Paint Echo-to-Echo Time interval between two successive back-wall echoes to eliminate paint or coating thickness
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
Thickness range 0.080 mm to 635.00 mm (0.003 in. to 25.000 in.) depending on material, transducer surface conditions, temperature, and selected configuration
Material velocity range 0.508 mm/μs to 13.998 mm/μs (0.020 in./μs to 0.551 in./μs)
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.)
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)
Keypad Sealed, color-coded keypad with tactile and audible feedback
Case Impact-resistant and water-resistant, gasketed case with sealed connectors. Designed for IP67.
Dimensions (W x H x D) Overall: 125 mm x 211 mm x 46 mm (4.92 in. x 8.31 in. x 1.82 in.)
Weight 0.814 kg (1.80 lb)
Power supply AC/DC adaptor, 24 V; lithium-ion battery 23.760 Wh; or 4 AA auxiliary batteries
Battery life, lithium-ion Operating time: minimum 12.6 h, 14 h typical, 14.7 h maximum Fast charge: 2 h to 3 h
Standards Designed for EN15317
Display Color transflective VGA display Liquid crystal display, display area 56.16 mm x 74.88 mm (2.2 in. x 2.95 in.)
Rectification Full wave, RF, half-wave positive, or half-wave negative
Inputs/Outputs USB 1.0 client
RS-232 Yes
Memory card Maximum capacity: 2 GB External microSD memory card
Video output VGA output standard
Internal Data logger Data logger The 38DL 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.
Capacity 475,000 thickness measurements or 20,000 waveforms with thickness measurements
File names, IDs, and comments 32-character file names and 20-character alphanumeric location codes with four comments per location
File structures Nine standard or custom application-specific file structures
Reports On-gauge reporting of summary with statistics, Min./Max. with locations, Min. review, file comparison, and alarm report
Software Options

38DLP-OXIDE (U8147014): Code-activated Internal Oxide measurement software
38DLP-HR (U8147015): Code-activated High Resolution measurement software
38DLP-MM (U8147016): Code-activated Multilayer measurement software
38DLP-HP (U8147017): Code-activated High Penetration (low frequency) measurement software
38DLP-EBSCAN (U8147018): Encoded B-scan software

Optional Accessories

38DLP/EW (U8778348): Three-year warranty
1/2XA/E110 (U8767104): Filter adaptor 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
BSCAN-ENC (U8779522): Encoded B-scan buggy
38DL–ENC-CBC-10 (U8840168): 10 ft encoder cable


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