Non-contact ultrasonic transducer BBDM-25KR20M

for level measurementfor obstacle detection

Overview
The BBDM-25KR20M is an air-coupled long-range ultrasonic distance transducer with a 25 kHz center frequency and a recommended operating range of 0.8 to 20 m. It is suitable for large-tank level monitoring, industrial distance measurement, collision avoidance, area monitoring and long-range target detection. The 0.8 m lower limit must be considered in mechanical integration when the closest target or maximum liquid level approaches the sensor.

Technical specifications
Parameter — Specification
Model — BBDM-25KR20M
Center frequency — 25 kHz ±5%
Recommended range — 0.8–20 m
Minimum impedance — 570 Ω ±20%
Capacitance — 5,500 pF ±20% at 1 kHz
Operating voltage — Peak voltage below 1,500 Vpp
Operating temperature — -40 to +80 °C
Pressure rating — Up to 3 kgf (0.3 MPa)
Beam characteristic — -3 dB half-power angle: 11° ±10%
Housing material — PTFE
Protection rating — IP68
Weight — 1,285 g ±5%

Beam clearance over the measurement span
The 11° half-power angle creates a narrower main lobe than many lower-frequency long-range sensors, but the beam still expands with distance. Vessel walls, inlet pipes, structural members or nearby machinery anywhere within the full 20 m path can introduce secondary echoes. Target tilt and surface texture will affect return amplitude and detectability.

Electrical matching
Design transmit/receive circuits to match the specified minimum impedance (570 Ω), capacitance (5,500 pF) and the stated peak-voltage limit to ensure reliable operation and signal integrity.

Technical features

• Model: BBDM-25KR20M
• Center frequency: 25 kHz ±5%
• Recommended range: 0.8–20 m
• Minimum impedance: 570 Ω ±20%
• Capacitance: 5,500 pF ±20% at 1 kHz
• Operating voltage: Peak voltage below 1,500 Vpp
• Operating temperature: -40 to +80 °C
• Pressure rating: Up to 3 kgf (0.3 MPa)
• Beam characteristic: -3 dB half-power angle: 11° ±10%
• Housing material: PTFE
• Protection rating: IP68
• Weight: 1,285 g ±5%