Ultrasonic sensing for gas flow meters
The BBFM-Q125K is a 125 kHz ultrasonic gas flow measurement transducer. It is intended for industrial gas flow meters, gas meters, gas velocity measurement and transit-time gas measurement modules.
The specified reference range is 0.12 to 2 m. Its half-power beam angle is 13.5° ±10% at -3 dB.
Technical specifications
| Parameter | Specification |
|---|---|
| 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 |
Gas measurement applications
- Industrial gas flow meters
- Gas meters
- Gas velocity measurement
- Transit-time gas measurement modules
Electrical circuit matching
Transmit and receive electronics should be matched to a minimum impedance of 1,100 Ω ±20% and capacitance of 460 pF ±20% at 1 kHz. Peak voltage must remain below 1,200 Vpp.