Ultrasonic flow transducer BBFM-Q28K

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28 kHz wetted transducer for liquid flow paths
The BBFM-Q28K is a wetted ultrasonic flow measurement transducer designed for industrial liquid flow meters, pipe velocity measurement and water-treatment flow monitoring. It is suitable for in-line installation and can be integrated into embedded flow measurement modules.

Standard configuration specifications
Parameter — Specification
Model — BBFM-Q28K
Center frequency — 28 kHz ±20%
Minimum impedance — 55 Ω ±20%
Capacitance — 65,000 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 — 20° ±10% at -3 dB
Housing material — 304 stainless steel + PI
Protection rating — IP68
Weight — 7,500 g ±5% with a 20 m ±0.3 m cable

Available acoustic configurations
Center frequency — Half-power beam angle at -3 dB
28 kHz ±20% — 20° ±10%
28 kHz ±5% — 53.7° ±10%

Electrical and installation matching
For the standard configuration, match the electronics to a minimum impedance of 55 Ω ±20% and capacitance of 65,000 pF ±20% at 1 kHz. Keep peak voltage below 3,000 Vpp. Operation is specified from -40 to +80°C and up to 10 kgf (1 MPa), with IP68 protection. The stated 7,500 g ±5% weight applies to the configuration with a 20 m ±0.3 m cable.

Technical characteristics / specifications

• Model: BBFM-Q28K
• Center frequency (standard): 28 kHz ±20%
• Alternate center frequency option: 28 kHz ±5%
• Half-power beam angle (standard): 20° ±10% at -3 dB
• Half-power beam angle (alternate): 53.7° ±10% at -3 dB
• Minimum impedance: 55 Ω ±20%
• Capacitance: 65,000 pF ±20% at 1 kHz
• Operating voltage: Peak voltage < 3,000 Vpp
• Operating temperature range: -40 to +80°C
• Pressure rating: ≤10 kgf or 1 MPa
• Housing material: 304 stainless steel + PI
• Protection rating: IP68
• Weight: 7,500 g ±5% (with 20 m ±0.3 m cable)
• Typical applications: industrial liquid flow meters, pipe velocity measurement, water-treatment flow monitoring, embedded flow measurement modules