Direct-contact ultrasonic transducer BBND-RT

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Overview
The BBND-RT series provides ultrasonic flaw transducers for rail flaw and broken-rail detection, metal crack inspection and internal-defect detection in industrial components. Available configurations cover 60 kHz, 200 kHz, 400 kHz and 3.5 MHz and support air-coupled or contact inspection depending on frequency and inspection arrangement.

Frequency and electrical configurations
Center frequency | Minimum impedance | Capacitance at 1 kHz | Peak operating voltage | Operating temperature | Pressure rating | Protection rating
60 kHz ±5% | 1,300 Ω ±20% | 3,500 pF ±20% | <1,000 Vpp | -20 to +60°C | ≤1 MPa | IP68
200 kHz ±5% | 350 Ω ±20% | 1,000 pF ±20% | <450 Vpp | -40 to +80°C | ≤0.3 MPa | IP68
400 kHz ±5% | 85 Ω ±20% | 4,500 pF ±20% | <750 Vpp | -40 to +80°C | ≤3 MPa | IP68
3.5 MHz ±5% | 2.5 Ω ±20% | 5,300 pF ±20% | <60 Vpp | -20 to +60°C | ≤1 MPa | IP68

Confirmed configuration differences
Frequency | Confirmed characteristic
60 kHz | Stainless-steel housing
200 kHz | 11.8° ±10% half-power angle; 0.15–2.5 m reference range; 304 stainless-steel housing; weight 247 g ±5%
3.5 MHz | Bandwidth ±20% at -3 dB

Inspection applications and selection

• Rail flaw and broken-rail detection
• Metal crack inspection
• Internal defects in industrial components
• Air-coupled or contact ultrasonic inspection (depending on configuration)

Frequency, bandwidth, acoustic path, coupling method, electrical matching, temperature and pressure must be selected as a compatible configuration for the material, thickness and expected defect size.

Technical specifications

• Series: BBND-RT
• Center frequencies: 60 kHz ±5%, 200 kHz ±5%, 400 kHz ±5%, 3.5 MHz ±5%
• Impedance (minimum): 1,300 Ω (60 kHz); 350 Ω (200 kHz); 85 Ω (400 kHz); 2.5 Ω (3.5 MHz) ±20%
• Capacitance at 1 kHz: 3,500 pF (60 kHz); 1,000 pF (200 kHz); 4,500 pF (400 kHz); 5,300 pF (3.5 MHz) ±20%
• Peak operating voltage: <1,000 Vpp (60 kHz); <450 Vpp (200 kHz); <750 Vpp (400 kHz); <60 Vpp (3.5 MHz)
• Operating temperature ranges: -20 to +60°C (60 kHz, 3.5 MHz); -40 to +80°C (200 kHz, 400 kHz)
• Pressure rating: ≤1 MPa (60 kHz, 3.5 MHz); ≤0.3 MPa (200 kHz); ≤3 MPa (400 kHz)
• Protection rating: IP68 (all configurations)
• Housing: stainless steel (60 kHz); 304 stainless steel (200 kHz confirmed)
• 200 kHz confirmed: 11.8° ±10% half-power angle; 0.15–2.5 m reference range; weight 247 g ±5%
• 3.5 MHz confirmed: bandwidth ±20% at -3 dB
• Supported inspection modes: air-coupled and contact ultrasonic inspection (depending on configuration)