Gas flow measurement over a 0.10 to 1.5 m reference path
The BBFM-Q135K is a 135 kHz ultrasonic gas flow measurement transducer. Its uses include industrial gas flow meters, gas meters, gas velocity measurement and transit-time gas measurement modules.
The recommended reference range is 0.10 to 1.5 m. At -3 dB, the half-power beam angle is 7° ±10%.
Technical data for system design
| Parameter | Specification |
|---|---|
| Model | BBFM-Q135K |
| Center frequency | 135 kHz ±5% |
| Recommended range | 0.10 to 1.5 m |
| Minimum impedance | 500 Ω ±20% |
| Capacitance | 1,900 pF ±20% at 1 kHz |
| Operating voltage | Peak voltage <300 Vpp |
| Operating temperature | -40 to +80°C |
| Pressure rating | ≤3 kgf or 0.3 MPa |
| Half-power beam angle | 7° ±10% at -3 dB |
| Housing material | Stainless steel |
| Protection rating | IP68 |
| Weight | 330 g ±5% with 1 m cable |
Gas metering applications
- Industrial gas flow meters
- Gas meters
- Gas velocity measurement
- Transit-time gas measurement modules
Excitation and receive-side requirements
Electronics should be matched to the 500 Ω ±20% minimum impedance and the 1,900 pF ±20% capacitance specified at 1 kHz. The peak drive voltage must remain below 300 Vpp.
The operating environment must stay within -40 to +80°C and the stated pressure limit of 3 kgf or 0.3 MPa. The product carries an IP68 protection rating.