Distance sensing with a water-cooled transducer assembly
The BBDM-17KR20M is an air-coupled ultrasonic distance transducer with a 17 kHz center frequency and a reference range of 1.8 to 20 m. Its stainless steel assembly is intended for large-tank level monitoring, industrial distance measurement, collision avoidance, area monitoring and long-range target detection.
The stated temperature limit of 160 degrees C applies only when water cooling is operating. Cooling connections, coolant flow and the surrounding thermal load must therefore be treated as part of the measurement installation, not as optional accessories.
Technical specifications
| Parameter | Specification |
|---|---|
| Model | BBDM-17KR20M |
| Center frequency | 17 kHz +/-5% |
| Recommended range | 1.8-20 m |
| Minimum impedance | 300 ohm +/-20% |
| Capacitance | 10,000 pF +/-20% at 1 kHz |
| Operating voltage | Peak voltage below 1,500 Vpp |
| Operating temperature | Up to 160 degrees C with water cooling |
| Pressure rating | Up to 3 kgf or 0.3 MPa |
| Beam characteristic | -3 dB half-power angle: 20.9 degrees +/-10% |
| Housing material | Stainless steel |
| Mounting | Refer to the dimensional drawing |
| Protection rating | IP68 |
| Weight | 3,780 g +/-5% with 15 m cable |
Beam coverage and target conditions
The specified -3 dB half-power angle is 20.9 degrees +/-10%. At longer distances, this relatively broad field must be checked against the tank geometry, vessel internals, nearby structures and the dimensions of the intended target. Unwanted echoes and changes in the air path can affect the usable result.
Thermal and mechanical integration
The installation must support a 3.78 kg transducer assembly and route the 15 m cable without loading the connections. Before selection, confirm the cooling arrangement, maximum local temperature, pressure, mounting dimensions, target surface and required measuring path. The drive and receive electronics must remain within the specified impedance, capacitance and peak-voltage limits.