Immersible ultrasonic transducer BBFM-Q21K

ruggedmeasurement

Product overview
The BBFM-Q21K is a wetted ultrasonic flow transducer operating at 21 kHz, engineered for industrial liquid flow meters, pipe velocity measurement and water-treatment monitoring. It is suitable for integration into embedded flow measurement modules and inline meter assemblies.

Performance and environmental
Half-power beam angle: 28.5° ±10% at -3 dB. Operating temperature: -40 to +80°C. Pressure rating: ≤10 kgf (1 MPa). Protection rating: IP68. Designed for continuous immersion and harsh industrial environments.

Acoustic, electrical and mechanical specifications
Model: BBFM-Q21K
Center frequency: 21 kHz ±10%
Minimum impedance: 130 Ω ±20%
Capacitance: 68,000 pF ±20% at 1 kHz
Operating voltage: Peak voltage < 3,000 Vpp
Operating temperature: -40 to +80°C
Pressure rating: ≤10 kgf or 1 MPa
Half-power beam angle: 28.5° ±10% at -3 dB
Housing material: 304 stainless steel + PI
Protection rating: IP68
Weight: 12.2 kg ±5% (with 20 m ±0.3 m cable)

Electrical and cable specifications
Drive and receive circuitry should be matched to the specified impedance and capacitance (130 Ω ±20%, 68,000 pF ±20% at 1 kHz). Peak drive voltage must remain below 3,000 Vpp. Weight specification applies to the version supplied with a 20 m ±0.3 m cable.

Applications

• Industrial liquid flow meters
• Pipe velocity measurement
• Water-treatment flow monitoring
• Embedded flow measurement modules

Technical specifications

• Model: BBFM-Q21K
• Center frequency: 21 kHz ±10%
• Half-power beam angle: 28.5° ±10% at -3 dB
• Minimum impedance: 130 Ω ±20%
• Capacitance: 68,000 pF ±20% at 1 kHz
• Operating voltage: Peak < 3,000 Vpp
• Operating temperature: -40 to +80°C
• Pressure rating: ≤10 kgf / 1 MPa
• Housing: 304 stainless steel + PI
• Protection: IP68
• Weight: 12.2 kg ±5% (with 20 m ±0.3 m cable)