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Industrial Solutions
Thickness and Flaw Inspection Solutions

Precision Single Element Transducers

ResourcesPrecision Thickness Gauging TheoryResourcesFrequently Asked Transducer Questions
Home/ Products/ Thickness Gauges/ Transducers and Accessories/ Precision Single Element Transducers
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  • Contact Transducers
  • Delay Line Transducers
  • Immersion Transducers
  • Test Blocks & Cables
  • Transducer Selector
  • Resources

Contact Transducers

Microscan™ transducers are frequently used for a variety of applications with thickness gauges, flaw detectors, and other ultrasonic instruments.

Microscan transducer part numbers reflect the connector designation:
RM = Right Angle Microdot™
SM = Straight Microdot
RB = Right Angle BNC
SB = Straight BNC
SU = Straight UHF

When selecting a transducer, please review the chart below or consult the transducer frequency range in the instruction manual that was shipped with your gauge.

Thickness Gauge Model
45MG
38DL PLUS®
Transducer Frequency Range
2.0 to 30 MHz

Contact Transducers

One of the advantages of a Microscan contact transducer is its versatility; a single transducer can cover a broad thickness range in many engineering materials. Contact transducers are constructed with the unique WC-5 wearplate for greater durability and a longer life.

Frequency
(MHz)
Element
(inches)
Diameter
(mm)
Transducer
Part Number
Transducer
Part Code
0.5 1 25 M101-SB† U8400017
1 1 25 M102-SB† U8400018
1 0.5 13 M103-SB† U8400020
2.25 0.5 13 M106-RM, M106-SM U8400023, U8400025
2.25 0.5 13 M1036 U8400019
5 0.5 13 M109-RM, M109-SM U8400027, U8400028
5 0.25 6 M110-RM, M110-SM, M110H-RM** U8400030, U8400031, U8400029
10 0.25 6 M112-RM, M112-SM, M112H-RM** U8400034, U8400035, U8400033
10 0.125 3 M1016 U8400015
20 0.125 3 M116-RM, M116-SM U8400038, U8400039
20 0.125 3 M116H-RM* U8400037

RM = Right Angle Microdot; SM = Straight Microdot; SB = Straight BNC
†High Penetration Transducer *Use with Holder, P/N 2133 **Use with Holder, P/N 2132

Delay Line Transducers

SONOPEN® Transducers

The Sonopen® transducer has a replaceable delay line that is tapered to a small contact area. This transducer makes reliable thickness measurements in applications such as turbine blades, threads on plastic bottle necks, and tight radii on plastic containers. High-temperature Sonopen delay lines are also available.

Frequency

Nominal
Element Size

Transducer
Part Numbers

MHz

Inches

mm

Straight
Handle

Right Angle
Handle

45°
Handle

15

0.125

3

V260-SM
U8411019

V260-RM
U8411018

V260-45
U8411017

Tip Diameter

InchesmmPart Number
0.08 2 DLP-3
0.06 1.5 DLP-302
0.08 2 DLP-301*

*High-temperature delay for use up to 350° F (175° C)

Delay Line Transducers

Microscan delay line transducers provide excellent performance on very thin materials, elevated temperatures, or in applications that require a high degree of thickness resolution.

Frequency
(MHz)
Element
(inches)
Diameter
(mm)
Transducer
Part Number
Transducer
Part Code
Holders
0.5 1 25 M2008† U8415001 -
2.25 0.5 13 M207-RB U8410017 -
5 0.5 13 M206-RB U8410016 -
5 0.25 6 M201-RM U8410001 -
5 0.25 6 M201H-RM* U8411030 2127
10 0.25 6 M202-RM, M202-SM U8410003, U8410004 -
10 0.25 6 M202H-RM* U8507023 2127
10 0.125 3 M203-RM, M203-SM U8410006, U8410007 -
20 0.125 3 M208-RM, M208-SM U8410019, U8410020 -
20 0.125 3 M208H-RM* U8410018 2133
20 0.125 3 M2055* U8415013 -
30 0.25 6 V213-BC-RM* U8411022 -

RM = Right Angle Microdot; SM = Straight Microdot; SB = Straight BNC † High Penetration Transducer *Used with Holder, P/C 2133

Replaceable Delay Lines

Standard Delay Lines

Standard delay lines are used in many applications. Special conditions such as high surface temperature, the curvature of the material, or hard-to-access areas may require the use of special delay lines.

Element
Diameter
Delay Line Part NumberMaximum Thickness
Measurement Limit*
Steel
Mode 2
Steel
Mode 3
Plastic
Mode 2
InchesmmInchesmmInchesmmInchesmm
0.5 13 DLH-2 1.0 25 0.5 13 0.5 13
0.25 6 DLH-1 1.0 25 0.5 13 0.5 13
0.125 3 DLH-3 0.5 13 0.2 5 0.2 5

*Exact range depends on material sound velocity, transducer frequency, part geometry, and surface condition.

High-Temperature Delay Lines

High-temperature delay lines function as a protective buffer between the hot surface of the test piece and the transducer's crystal. At elevated temperatures, intermittent contact is recommended to protect the transducer from thermal damage.

Element
Diameter

High-Temperature Delays

To 350 °F
(175 °C)
To 500 °F
(260 °C)
To 900 °F
(480 °C)
Inchesmm
0.5 13 DLHT-201 DLHT-2 DLHT-2G
0.25 6 DLHT-101 DLHT-1 DLHT-1G
0.125 3 DLHT-301 DLHT-3 DLHT-3G

Immersion Transducers

Immersion Transducers

Microscan immersion transducers are designed to transmit and receive ultrasound in water. Thickness measurements by immersion technique are often preferred when the test piece has a complex geometry or in online applications. Typical offline applications include wall thickness measurements on small diameter plastic or metal tubing, scanned or rotary measurements and thickness measurements on sharply curved parts. Transducer focusing may be necessary depending on the application.

FrequencyElement DiameterTransducer Part NumberTransducer Part
Code
(MHz)inchesmm
2.25 0.5 13 M306-SU U8410027
5 0.5 13 M309-SU U8420001
5 0.25 6 M310-SU U8420004
10 0.25 6 M312-SU U8420008
15 0.25 6 M313-SU U8420009
20 0.125 3 M316-SU U8420011

Bubblers

We offer bubblers for easy implementation of immersion testing. They act as a holder for the transducers to maintain consistent water flow from transducer to test surface, and prevent the accumulation of air bubbles on the transducer face.

Part NumberOpeningWater PathFits Transducer
Part Number
inchesmminchesmm
B100 0.125 3 1.25 32 M310A-SM, M312A-SM, M316A-SM
B103* 0.35 9 0.575 14.5 M310-SU, M312-SU, M313-SU, M316-SU
B103W* 0.55 14 0.775 19.7 M306-SU, M309-SU
B103A* 0.35 9 0.575 14.5 same as B103
* The B103 has a V-notch shaped opening; the B103A and B103W are flat.

Bubbler Transducer Assembly

Handheld bubbler transducers are available in either 20 MHz (V316B) or 10 MHz (V312B). They are immersion transducers that screw onto a bubbler assembly (B120), which has a replaceable stainless steel tip and a water feed tube. They offer high resolution and easy access inspection of thin materials.

RBS-1 Immersion Tank

RBS-1 immersion tank is designed to simplify ultrasonic thickness measurements using immersion techniques. It consists of a clear acrylic tank, a submersible pump and a transducer fixture in a single, portable unit. It is ideal for offline thickness measurements on metal, glass and plastic products such as small containers, pipe or tubing, sheets or plates or machined parts.

Tank
• 5.5 x 12 x 8 in (140 x 305 x 200 mm)
• 0.83 gallon (3.1 liter) capacity

Pump
• 0 to 0.25 gallons (0 to 0.9 liters) per minute
• 115 or 230 V, 30 Watt (voltage range 90 to 135 VAC), 50 to 60 Hz
• Submersible (ground fault interrupter circuit recommended)

Couplants

The use of couplant is almost always necessary to provide acoustic coupling between the transducer and the test piece. We offer various types of couplants to suit virtually all applications.

Part NumberDescriptionVolumeApplication
A2
AP
AQ
AG
Propylene Glycol
Propylene Glycol
Propylene Glycol
Propylene Glycol
2 oz (0.06 liter)
1 pint (0.47 liter)
1 quart (0.95 liter)
1 gallon (3.78 liter)
General purpose couplant for smooth surfaces. Chemically non-reactive; does not evaporate quickly. The maximum recommended temperature is 200 °F (90 °C)
B2
BQ
Glycerin
Glycerin
2 oz. (0.06 liter)
1 qt. (0.95 liter)
General purpose, more viscous and has a high acoustic impedance making it the preferred couplant for rough surfaces and highly attenuating materials.
D12
DG
D-5G
Gel Type
Gel Type
Gel Type
12 oz. (0.35 liter)
1 gal. (3.78 liter)
5 gal. (18.90 liter)
Rough surfaces such as sand-cast metals and fiberglass layups, weld inspections, overhead surfaces or vertical walls.
E-2 Ultratherm 2 oz. (0.06 liter) 500 °F to 970 °F (260 °C to 520 °C)
G-2 Medium Temp 2 oz. (0.06 liter) 0 °F to 600 °F (-12 °C to 315 °C) Easy removal at high temperatures. Non-toxic and biodegradable
SWC Shear Wave 4 oz. (0.12 liter) Normal Incidence Shear Wave, non-toxic, water soluble organic substance of very high viscosity.

Test Blocks & Cables

Calibration Test Blocks

Test blocks are necessary for the calibration of ultrasonic thickness gages and should be used to maintain and verify the accuracy, dependability and reliability of ultrasonic measurements. Blocks are held to tighter tolerances than called out in ASTM E797 code. Metric test blocks are available.

Part NumberMaterialSteps
2211E 304 Stainless Steel .100, .200, .300, .400 and .500 in
2212E 1018 Carbon Steel .250, .500, .750, .400 and 1.00 in
2213E 7075-T6 Aluminum .100, .200, .300, .400 and .500 in
2214E 1018 Carbon Steel .100, .200, .300, .400 and .500 in
2214M 1018 Carbon Steel 2.5, 5.0, 7.5, 10.0 and 12.5 mm

Transducer Cables
Olympus-NDT offers a wide selection of transducer cables suitable for all ultrasonic thickness gaging instrumentation.

Part NumberConnectorsAvailable Lengths
LCM-74-X Small LEMO® 00 to Microdot® 3 ft (0.9 m), 4 ft (1.2 m),
6 ft (1.8 m)
LCB-74-X Small LEMO® 00 to BNC 3 ft (0.9 m), 4 ft (1.2 m),
6 ft (1.8 m)
BCM-74-X BNC to Microdot® 3 ft (0.9 m), 4 ft (1.2 m),
6 ft (1.8 m)
LCU-74-X LEMO® 00 to UHF 3 ft (0.9 m)

 

Standard

• Standard cables are recommended for normal usage.
Heavy Duty - Teflon®

• Heavy duty, Teflon® (HD) transducer cables may provide durability and longer life.

Waterproof

• Waterproof (W) cables are recommended in many tests with immersion transducers. These cables provide a waterproof connection good to about 30 ft (10 m) of fresh water. At greater depths, special cables are available.

Heavy Duty - Armored PVC Jacket


• Heavy duty, armored PVC jacket (HDAP) transducer cables have a spiral stainless steel jacket with a solid PVC coating. Maximum length is 20 ft (7 m).

Heavy Duty - Armored Silicone Jacket

• Heavy duty, armored super flexible silicone jacket (HDAS) transducer cables combine a spiral stainless steel jacket with a heavy silicone coating for great flexibility. Length can be specified up to 20 ft (7 m).
Heavy Duty - Stainless Steel

• Heavy duty, armored stainless steel jacket (SSA) transducer cables are recommended for heavy and industrial use provide flexibility, protection and long life.

Transducer Selector

Please choose your material below to see relevant transducers.

Material *
Material Type *
High Resolution *
Small Radius *
High Temperature *

Your search did not yield any results.

Choose…

High Resolution

Measurement to 0.0001 in. or 0.001 mm resolution. Usually recommended only when measuring smooth, acoustically transmissive materials like most metals and ceramics with delay line transducers.

Small Radius

Measurement on curved surfaces with radiuses smaller than approximately 50 mm or 2”. This requires small diameter transducers.
Below 1.000” OD: Use 0.250” diameter transducer or smaller
Below 0.500” OD: Use 0.125” diameter transducer or smaller
Below 0.250” OD: Use V260 Sonopen
Below 0.125” OD: Use immersion transducers
Consult Olympus for details.

High Temperature

Surface temperature greater than 50º C or 125º F. In such cases a high temperature delay line transducer must be used.

Precision Thickness Gage Transducer Ranges for Metals, Plastics and Miscellaneous Materials

These tables are intended as a general guideline only, listing only the most commonly used Microscan transducers and typical material thickness ranges when used with the Olympus Model 38DL PLUS and 45MG gages (45MG-SE or 45MG-HP software option required.) All thickness ranges are approximate and should be used as a starting point. The actual measurement range in a given case will always depend on instrument setup as well as material properties such as part geometry, surface condition, and grain structure.

In many cases, these measurement ranges will require an optimized gage setup where gain and blanking have been adjusted by a trained operator. The pre-programmed transducer default setups can always be used as a starting point, but performance can be often optimized and range extended with some simple setup adjustments. Contact Olympus for details.

Your choices also depend on geometry, temperature and resolution. Please consider the follloiwng before making your selections.

NameDescription
High Resolution Measurement to 0.0001” or 0.001 mm resolution. Usually recommended only when measuring smooth, acoustically transmissive materials like most metals and ceramics with delay line transducers.
Small Radius Measurement on curved surfaces with radiuses smaller than approximately 50 mm or 2”. This requires small diameter transducers.
Below 1.000” OD: Use 0.250” diameter transducer or smaller
Below 0.500” OD: Use 0.125” diameter transducer or smaller
Below 0.250” OD: Use V260 Sonopen
Below 0.125” OD: Use immersion transducers
Consult Olympus for details.
High Temperature Surface temperature greater than 50º C or 125º F. In such cases a high temperature delay line transducer must be used.

Resources

Infographics

Selecting the Right Transducer for Your Flaw Detection Application

White Papers

An Introduction to Ultrasonic Transducers for Nondestructive Testing

Tutorials

Precision Thickness Gauging Theory

FAQs

Frequently Asked Transducer Questions

Brochures

Ultrasonic Transducer Catalog
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