Ultrasonic Flow Sensor 1MHz
A 1 MHz transit-time transducer pair that starts up quickly and returns an easily identified signal edge, so the metering ASIC can lock onto the upstream and downstream arrival times without long averaging.
- High sensitivity
- It starts up quickly and the signal is easy to identify
The problem it solves. A water meter has to resolve a flow difference measured in nanoseconds of transit time, on battery power, for years, with no moving part to wear.
Ask for: operating frequency, dimensions, supply voltage, lead length and connector. These are confirmed per order against the current drawing.
Specifications
| Sensing principle | Transit-time; the propagation speed of sound changes with the flow velocity of the medium |
|---|---|
| Measured quantity | Time difference, phase difference or frequency change between co-current and counter-current directions |
| Nominal frequency | 1 MHz |
| Medium | Liquids, including water |
| Collar | Moulded light blue collar around the ceramic face |
| Lead | Twin grey lead wire |
| Beam angle and dimensions | TBC - confirm with the engineering team |
Application scenarios
- Smart water meter flow monitoring
- Distance measurement in water
Why this configuration
- Fast start-up shortens the transmit window, which is where a battery-powered meter spends most of its energy budget.
- A clean, easily identified echo edge reduces the averaging needed for a stable reading at low flow.
- Supplied as a matched pair on request, so the two channels of a transit-time path behave the same.
Questions engineers ask about this sensor
1 MHz or 2 MHz for my meter?
1 MHz penetrates further and tolerates more attenuation, which suits a larger bore or a less clean medium. 2 MHz gives a shorter wavelength and finer timing resolution in a small bore. Tell us your pipe size and medium and we will recommend one.
Can the pair be frequency-matched?
Yes. State that you need a matched pair in your enquiry and we will pair units from the same production batch.
Does it work for distance measurement in water as well as flow?
Yes - in-water ranging is one of the listed application scenarios for this transducer. The same acoustic path is used, with the timing taken as a round trip instead of a differential.
What lead length can I get?
Lead length is specified per order. Give us the distance from the transducer boss to the meter board.
Application notes
Related sensors
Ultrasonic Flow Sensor 2MHz
A 2 MHz transit-time transducer with a metal-faced housing: the shorter wavelength gives finer timing resolution on a short acoustic path, and the metal face takes the pressure and the wetted duty.
View specifications →
Ultrasonic Material Recognition Sensor 1
A reflection-type ultrasonic transducer that reads back the change in frequency and amplitude of the returned wave, so metal, plastic and wood separate cleanly without any contact with the target.
View specifications →Get the current drawing for this sensor
Tell us the medium, the path and the mounting boss. We will send the configuration that fits, with lead and connector specified.