The Sonatest SMM and LMM series consist of small and large single normal beam compression wave contact transducers equipped with replaceable soft membrane faces. Built with circular lead metaniobate crystals and medium damping for medium bandwidth, these transducers are designed to maintain optimal acoustic coupling on rough, curved, or uneven surface conditions.
The Sonatest SMM 4-10Z is a small, single normal beam compression wave contact transducer featuring a replaceable soft membrane face and a side-entry LEMO 00 (Z) connector. Fitted with a 10 mm circular lead metaniobate crystal operating at 4 MHz, this transducer is optimised for non-destructive testing on rough, curved, or unmachined material surfaces where superior acoustic coupling is essential.
Normal Beam Compression Wave: Designed for direct 0° straight-beam contact inspections.
Replaceable Soft Membrane: Conforms to uneven or rough surfaces to protect the transducer face and ensure uniform sound transmission.
Lead Metaniobate Element: Provides stable acoustic performance across general-purpose NDT applications.
Medium Damped: Engineered for medium bandwidth to offer a balance between penetration depth and signal resolution.
Thermal Limit: Rated for continuous operation up to 50°C (120°F).
| Specification | Parameter / Value |
| Product Code |
SMM 4-10 (SMM 4-10Z) |
| Transducer Type |
Single Softface 0° |
| Frequency |
4 MHz |
| Crystal Diameter |
10 mm (0.394 in) |
| Nearfield Length in Steel |
16.8 mm (0.661 in) |
| Case Diameter |
23 mm (0.906 in) |
| Case Height |
42 mm (1.654 in) |
| Connector Type |
LEMO 00 (Z) |
| Connector Position |
Side |
Testing and evaluation of castings
Flaw detection in forgings
Integrity testing of white metal bearings
Straight-beam ultrasonic inspection of rough or unmachined components
**Errors and omissions excepted (E&OE)
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