Ultrasonic transit-time flow transducer BBFM-Q125K

gas

Overview
The BBFM-Q125K is a 125 kHz ultrasonic transducer designed for gas flow measurement in industrial meters and transit-time systems. It provides a narrow beam and IP68 protection for reliable operation in demanding environments.

Technical specifications

• Model: BBFM-Q125K
• Center frequency: 125 kHz ±5%
• Recommended range: 0.12 to 2 m
• Minimum impedance: 1,100 Ω ±20%
• Capacitance: 460 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
• Half-power beam angle: 13.5° ±10% at -3 dB
• Dimensions: Ø16 × 19
• Protection rating: IP68
• Weight: 12 g ±5% with 20 cm cable

Applications

• Industrial gas flow meters
• Commercial and utility gas meters
• Gas velocity measurement
• Transit-time gas measurement modules

Electrical matching
Transmit and receive circuits should be matched to a minimum impedance of 1,100 Ω ±20% and capacitance of 460 pF ±20% at 1 kHz. Ensure peak drive voltage remains below 1,200 Vpp to avoid element damage.

Installation & environment
Mount according to system design ensuring acoustic path within the 0.12–2 m range. IP68 protection and the specified temperature and pressure ratings make the transducer suitable for submersible or harsh installations; use the supplied 20 cm cable or specify cable options as required.