Ultrasonic flow transducer BBFM-Q140K

ruggedgascompact

140 kHz transducer for compact gas measurement paths
The BBFM-Q140K is an ultrasonic transducer designed for industrial gas flow meters, gas velocity measurement and integration into transit-time gas measurement modules. Documented reference range is 0.12 to 1 m, with an acoustic half-power angle of 18.2° ±10% at -3 dB. Operating conditions include -40 to +80°C, up to 3 kgf (0.3 MPa) pressure and IP68 protection.

Verified acoustic and electrical data
Model: BBFM-Q140K
Center frequency: 140 kHz ±5%
Recommended range: 0.12 to 1 m
Minimum impedance: 1,200 Ω ±20%
Capacitance: 250 pF ±20% at 1 kHz
Operating voltage: Peak voltage <1,200 Vpp
Operating temperature: -40 to +80°C
Pressure rating: ≤3 kgf or 0.3 MPa
Beamwidth: 18.2° ±10% half-power angle at -3 dB
Mounting: Refer to the dimensional drawing
Protection rating: IP68
Weight: 8 g ±5% with a 38 cm cable

Planning a short gas-flow acoustic path
When positioning transducers inside a meter chamber, use the 0.12–1 m reference range together with the 18.2° ±10% half-power angle to define the acoustic path. Verify final path length, target geometry, mounting space and interface dimensions against the intended instrument. Electronics must accommodate a minimum impedance of 1,200 Ω ±20%, capacitance of 250 pF ±20% at 1 kHz and peak voltage <1,200 Vpp. The listed weight (8 g ±5%) corresponds to the unit with a 38 cm cable.

Details to establish before integration

• Gas medium and temperature range
• Required measuring distance or acoustic path
• Meter chamber and target geometry
• Mounting space and interface dimensions
• Operating pressure and protection requirements
• Drive/receive electronics, cable routing and connection method

Features / Technical specifications

• Model: BBFM-Q140K
• Center frequency: 140 kHz ±5%
• Reference (recommended) range: 0.12 to 1 m
• Half-power beamwidth: 18.2° ±10% at -3 dB
• Minimum impedance: 1,200 Ω ±20%
• Capacitance: 250 pF ±20% at 1 kHz
• Operating voltage: Peak voltage <1,200 Vpp
• Operating temperature: -40 to +80°C
• Pressure rating: ≤3 kgf (0.3 MPa)
• Protection rating: IP68
• Weight: 8 g ±5% (with 38 cm cable)