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Sigma standard duals are comprised of a side-by-side wedge pair of "Loten." The standard dual, normally used in the manual mode, is capable of withstanding temperatures up to 350° F (by request), and can withstand an accumulated dose greater than 10 to the 8 RADS. However, SIGMA standard duals are also available in any of the other wedge materials.

In the past SIGMA duals were manufactured primarily from tempered lucite, SIGMA will continue to use lucite for those customers whose probes were qualified using lucite, until such time as they wish to requalify with the improved wedge material "loten".

To order please call SIGMA, or define the unit according to the "PART NUMBER GUIDELINE"

The following is an example of a typical part No.:

SDA5-2(18X10)60L-F30-RAI 75 describes the following unit:

  • Sigma Dual
  • For testing in Austinetic material
  • Operating frequency 2MHz
  • 2 elements 18 mm Long by 10 mm wide
  • Refracted Exit Angle 60 degree Long.
  • Focal sound path 30 mm
  • Radiused Axially for an I.D. surface 75 mm

SIGMA Standard Focused Dual Angle Beam Transducers, are available as mechanized units for automated scanning systems. To specify, simply select the standard unit desired and request "Mechanized Unit".

Each SIGMA Transducer is certified using the Sonix ProbeTEST™. A permanent record is maintained at SIGMA to verify comparison with probes manufactured at a later time. A copy of the certification is supplied to the customer at


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