Ultrasonic transit-time flow transducer BBFM-Q200K-B

ultrasonicacousticvolume

Overview
The BBFM-Q200K-B is an ultrasonic gas flow transducer for industrial gas flow meters and transit-time measurement modules. It operates at a center frequency of 200 kHz ±5% and is optimized for acoustic paths in the 0.10–1.5 m reference range. Two beam/mounting options are available: a narrow-beam variant with M18 × 1.5 thread and a wider-beam variant with mounting per dimensional drawing. The unit is designed for in-line and clamp-mounted metering applications where IP68 protection is required.

Core technical specifications
Parameter — Specification
Model — BBFM-Q200K-B
Center frequency — 200 kHz ±5%
Recommended range — 0.10 to 1.5 m
Minimum impedance — 900 Ω ±20%
Capacitance — 600 pF ±20% at 1 kHz
Operating voltage — Peak voltage < 450 Vpp
Operating temperature — -40 to +80°C
Pressure rating — ≤3 kgf (0.3 MPa)
Standard half-power beam angle — 6° ±10% at -3 dB
Standard mounting — M18 × 1.5 thread
Protection rating — IP68

Available configurations

• 200 kHz ±5% — 6° ±10% at -3 dB — Stainless steel housing — M18 × 1.5 thread
• 200 kHz ±5% — 11.8° ±10% at -3 dB — 304 stainless variant — mounting per dimensional drawing

Specified metering applications

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

Selection and electrical integration
Select beam angle and mounting to match the acoustic path, gas medium and installation constraints. Ensure the measuring path remains within the 0.10–1.5 m reference range.

• Match transmit/receive electronics to a minimum impedance of 900 Ω ±20% and capacitance of 600 pF ±20% at 1 kHz.
• Maintain peak drive voltage below 450 Vpp.
• Verify operation across -40 to +80°C and up to 3 kgf (0.3 MPa) pressure.
• Confirm IP68 sealing for the intended installation.

Technical specifications

• Model: BBFM-Q200K-B
• Center frequency: 200 kHz ±5%
• Recommended (reference) range: 0.10 to 1.5 m
• Minimum impedance: 900 Ω ±20%
• Capacitance: 600 pF ±20% at 1 kHz
• Operating voltage: Peak voltage < 450 Vpp
• Operating temperature: -40 to +80°C
• Pressure rating: ≤3 kgf (0.3 MPa)
• Standard half-power beam angle: 6° ±10% at -3 dB
• Alternative beam option: 11.8° ±10% at -3 dB (see dimensional drawing for mounting)
• Standard mounting: M18 × 1.5 thread
• Housing / material: Stainless steel / 304 variants
• Protection rating: IP68