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NDT Equipment and Accesories
Measuring and Testing Instruments


Dual Element Transducers

Two angled elements create a V-shaped sound path in the test material. This "Pseudo-Focus" enhances resolution in the focal zone.

A dual element transducer consists of two crystal elements housed in the same case, separated by an acoustic barrier. One element transmits lon gitudinal waves, and the other element acts as a receiver.

Advantages:

  • Improves near surface resolution
  • Eliminates delay line multiples for high temperature applications
  • Couples well on rough or curved surfaces
  • Reduces direct back-scattering noise in coarse grained or scattering materials
  • Combines penetration capabilities of a lower frequency single element transducer with the near surface resolution capabilities of a higher frequency single element transducer
  • Can be contoured to conform to curved parts

Applications:

  • Remaining wall thickness measurement
  • Corrosion/erosion monitoring
  • Weld overlay and cladding bond/disbond inspection
  • Detection of porosity, inclusions, cracks, and laminations in castings and forgings
  • Crack detection in bolts or other cylindrical objects
  • Maximum temperature capability is 800°F (425°C) for 5.0 MHz and below; 350°F (175°C) for 7.5 MHz and 10 MHz. Recommended duty cycle for surface temperatures from 200°F (90°C) to 800°F (425°C) is ten seconds maximum contact followed by a minimum of one minute air cooling (does not apply to Miniature Tip Dual)

Flush Case Duals

  • Metal wear ring extends transducer life
  • Wear indicator references when transducer face needs resurfacing
  • Knurled, 303 stainless steel case
  • Replaceable cable design (special dual cables with strain relief available)
Freq. Nominal Element Size Transducer
Part Numbers
MHz inches mm  
1.0 0.50 13 DHC703-RM
2.25 0.50 13 DHC706-RM
0.25 6 DHC785-RM
5.0 0.50 13 DHC709-RM
0.25 6 DHC711-RM
10 0.25 6 DHC713-RM

 

 

 

 

 

 

 

 

Flush Case Dual Cables

Cable Part
Number
Fits Connector Style
BCMD-316-5F Dual BNC to Microdot®
L1CMD-316-5F Dual Large Lemo 1 to Microdot
LCMD-316-5F Dual Small Lemo 00 to Microdot

Composite Element Flush Case Duals

Freq. Nominal
Element Size
Transducer Part Number
MHz inches mm  
2.25 0.50 13 CHC706-RM

Fingertip Duals

  • Knurled case, except the 0.25" (6 mm) element size
  • High-strength flexible 6' (1.8 m) potted cable (fits BNC or Large Lemo® 1 connectors)
Freq. Nominal
Element Size
Transducer
Part Numbers
MHz inches mm Fits BNC Connector Fits Large Lemo Connector
1.0 0.75 19 D714-RP D714-RPL1
0.50 13 D703-RP D703-RPL1
2.25 0.75 19 D705-RP D705-RPL1
0.50 13 D706-RP D706-RPL1
0.375 10 D771-RP D771-RPL1
0.25 6 D785-RP D785-RPL1
3.5 0.75 19 D781-RP D781-RPL1
0.50 13 D782-RP D782-RPL1
0.375 10 D783-RP D783-RPL1
0.25 6 D784-RP D784-RPL1
5.0 0.75 19 D708-RP D708-RPL1
0.50 13 D709-RP D709-RPL1
0.375 10 D710-RP D710-RPL1
0.25 6 D711-RP D711-RPL1
7.5 0.50 13 D720-RP D720-RPL1
0.25 6 D721-RP D721-RPL1
10 0.50 13 D712-RP D712-RPL1
0.25 6 D713-RP D713-RPL1

Miniature Tip Dual

  • Provides better coupling on curved surfaces
  • Low profile allows for better access in areas of limited space
  • Maximum temperature capability 122°F (50°C)

Freq. Tip
Diameter
Nominal
Element Size
Transducer
Part Number
MHz inches mm inches mm  
5.0 0.20 5 0.15 3.8 MTD705

Miniature Tip Dual Cables

  • Replaceable cable for all flaw detectors
Cable Part Number Fits Connector Style
BCLPD-78-5 Dual BNC to Lepra/Con
L1CLPD-78-5 Dual Large Lemo 1 to Lepra/Con
LCLPD-78-5 Dual Small Lemo 00 to Lepra/Con

Extended Range Duals

  • Shallow roof angles provide greater sensitivity to deep flaws, back walls, and other reflectors, 0.75" (19 mm) and beyond in steel
  • Can be used for high temperature measurements when delay lines are unacceptable
  • High-strength flexible 6' (1.8 m) potted cable with BNC connectors
Freq. Nominal
Element Size
Roof Angle Transducer
Part Numbers
MHz inches mm (°)  
2.25 1.00 25 0 D7079
0.50 13 0 D7071
0.50 13 1.5 D7072
0.50 13 2.6 D7074
0.50 13 3.5 D7073
5.0 1.00 25 0 D7080
0.50 13 0 D7075
0.50 13 1.5 D7076
0.50 13 2.6 D7078
0.50 13 3.5 D7077

 

Fingertip and Extended Range Dual

 
Transducer Dimensions (inches)
Nominal Element Size (A) (B) (C)
1.00* 1.25 0.75 1.00
0.75 1.00 0.75 0.75
0.50 0.70 0.75 0.50
0.50* 0.70 0.63 0.61
0.375 0.53 0.62 0.375
0.25 0.35 0.54 0.25


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