Non-contact ultrasonic transducer BBDM-33KR12M

proximityfor level measurementfor obstacle detection

Overview
The BBDM-33KR12M is an air-coupled ultrasonic distance transducer with a 33 kHz center frequency and a reference range of 0.45 to 12 m. It is suited to tank and vessel level measurement, industrial equipment ranging, vehicle and machinery collision avoidance, security systems and area monitoring. The 8.9° half-power angle produces a relatively narrow main beam. The specified cable/lead length is 3 cm.

Technical specifications
Model: BBDM-33KR12M
Center frequency: 33 kHz ±5%
Recommended range: 0.45–12 m
Minimum impedance: 85 Ω ±20%
Capacitance: 6,200 pF ±20% at 1 kHz
Operating voltage: Peak voltage below 1,000 Vpp
Operating temperature: -40 to +80 °C
Pressure rating: Up to 10 kgf / 1 MPa
Beam characteristic: -3 dB half-power angle: 8.9° ±10%
Protection rating: IP68
Weight: 260 g ±5%
Cable length: 3 cm

Alignment and closest target
The 0.45 m lower-range limit and narrow beam require careful mounting. The acoustic axis should remain directed at the target for the full expected motion. Vessel structures, machine guards or fixtures must be kept outside the main beam to avoid false echoes. Tilted liquid surfaces or small targets can deflect energy away from the receiver and reduce effective range.

Electrical matching
Designs should account for the specified minimum impedance (85 Ω), capacitance (6,200 pF at 1 kHz) and the peak voltage limit (below 1,000 Vpp). Proper matching and transient protection are recommended for reliable operation.

Technical data

• Model: BBDM-33KR12M
• Center frequency: 33 kHz ±5%
• Reference / Recommended range: 0.45–12 m
• Half-power angle: 8.9° ±10%
• Minimum impedance: 85 Ω ±20%
• Capacitance: 6,200 pF ±20% at 1 kHz
• Operating voltage: Peak voltage below 1,000 Vpp
• Operating temperature: -40 to +80 °C
• Pressure rating: up to 10 kgf / 1 MPa
• Protection rating: IP68
• Weight: 260 g ±5%
• Cable/lead length: 3 cm