The Sonatest THM series consists of dual normal beam compression wave contact transducers engineered for precise non-destructive testing and thickness evaluation. Built with rectangular lead zirconate titanate crystals and medium damping for medium bandwidth, these twin-contact transducers provide enhanced near-surface resolution and reliable flaw detection across structural components.
Key Features:
Dual Normal Beam Design: Utilises separate transmitter and receiver elements for improved near-surface signal resolution.
Lead Zirconate Titanate Crystals: Features durable rectangular crystal elements designed for consistent acoustic output.
Medium Damping: Balanced for medium bandwidth signal performance and penetration.
Temperature Versatility: Standard operating temperature range up to 50°C (120°F), with high-temperature options available for specialised applications.
Dual LEMO 00 Connectors: Fitted with side-entry LEMO 00 (Z) connector options for secure twin-cable attachment.
Common Applications
Evaluation of castings and forgings
Precision thickness surveys and corrosion monitoring
Near-surface flaw detection
Transducer Models
| Product Code | Description | Frequency (MHz) | Crystal Dimensions (mm / Inches) | Nearfield Length in Steel (mm / Inches) |
| THM2-10 | Twin Contact 2MHz 0° LEMO 00 | 2 MHz | 11 mm / 0.433″ | 10.2 mm / 0.402″ |
| THM2-24 | Twin Contact 2MHz 0° LEMO 00 | 2 MHz | 7 x 18 mm / 0.276 x 0.709″ | 27.2 mm / 1.071″ |
| THM4-10 | Twin Contact 4MHz 0° LEMO 00 | 4 MHz | 3.5 x 10 mm / 0.138 x 0.394″ | 16.8 mm / 0.661″ |
| THM4-24 | Twin Contact 4MHz 0° LEMO 00 | 4 MHz | 6 x 20 mm / 0.236 x 0.787″ | 67.1 mm / 2.642″ |
Case Dimensions and Details
| Crystal Size | Width/Diameter (mm / Inches) | Height (mm / Inches) | Connector Options | Position Options |
| 11 mm / 0.433″ | 20 mm / 0.787″ | 45 mm / 1.772″ | Z | Side |
| 7 x 18 mm / 0.276 x 0.709″ | 32 mm / 1.26″ | 60 mm / 2.362″ | Z | Side |
| 3.5 x 10 mm / 0.138 x 0.394″ | 20 mm / 0.787″ | 45 mm / 1.772″ | Z | Side |
| 6 x 20 mm / 0.236 x 0.787″ | 32 mm / 1.26″ | 60 mm / 2.362″ | Z |
**Errors and omissions excepted (E&OE)
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