Ultrasonic transit-time flow transducer BBFM-Q42K

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Overview
The BBFM-Q42K is a 42 kHz ultrasonic transit-time flow transducer designed for flue-gas and high-temperature industrial gas measurement. It is intended for integration on ducts, stacks and exhaust lines to provide reliable transit-time signals in temperatures from -40 to +150°C. The unit is pressure-rated to ≤3 kgf (0.3 MPa) and features an IP68 protection level with a titanium-alloy housing for corrosion resistance in aggressive gas environments.

Key features

• 42 kHz center frequency optimized for gas-phase transit-time measurement
• High-temperature operation from -40 to +150°C
• Titanium-alloy housing for corrosion and temperature resistance
• IP68 protection for immersion and harsh environments
• Compatible with transit-time ultrasonic flow electronics

Technical specifications

• Model: BBFM-Q42K
• Center frequency: 42 kHz ±5%
• Minimum impedance: 150 Ω ±20%
• Capacitance: 2,600 pF ±20% at 1 kHz
• Operating voltage: Peak voltage <1,500 Vpp
• Operating temperature: -40 to +150°C
• Pressure rating: ≤3 kgf or 0.3 MPa
• Housing material: Titanium alloy
• Protection rating: IP68

Applications

• Flue-gas flow measurement
• Boiler exhaust monitoring
• Industrial emission ducts
• Transit-time measurement in high-temperature gas streams

Installation & compatibility
Designed for clamp-on or flange-mounted integration depending on site requirements. Ensure correct acoustic coupling and thermal isolation when installing on high-temperature ducts. Compatible with standard transit-time ultrasonic flow transmitters; verify impedance and drive requirements with the transmitter supplier.

Ordering information

• Standard model: BBFM-Q42K
• Available options: custom cable lengths, mounting accessories and factory calibration on request