can the receivers be used as transmiters? I only need transmitters.

No, the receivers are marked with R and transmitters with T. You could experiment and see. If you don't want to experiment, assume they are not the same and you must use R for receiver and T for a transmitter.

Do these do their own tone generation/demodulation? Or are they effectively high-frequency speakers/mics and an external circuit does the processing?

They are effectively a high frequency speaker/mic

Can you use this to measure flow rate in a pressurized water pipe? How about gas?

Most likely for water. For gas, it would depend on the gas density, and the sensitivity of your circuit. I was able to get some pretty precise nodes in my setup for other things, so provided you know the math needed to calibrate the system, it should get job done. Are you trying to measure the speed using flight time or doppler?

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HiLetgo One Pair 16MM Ultrasonic Sensor Probe Split Ultrasonic Transceiver+Receiver

HiLetgo One Pair 16MM Ultrasonic Sensor Probe Split Ultrasonic Transceiver+Receiver

Product ID: 313410396

🎧≥-75dB receiver sensitivity

📡40KHz precise frequency

🔊≥110dB emission sound pressure

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Description

📡 Elevate your sensing game with precision ultrasonic power!

POWERFUL EMISSION - Emits sound pressure ≥110dB at 10V for superior signal strength
COMPACT LIGHTWEIGHT - 16mm size and 18g weight fit effortlessly into any sensor array
HIGH SENSITIVITY RECEIVER - Receives signals at ≥-75dB sensitivity, capturing subtle echoes
PLUG PLAY COMPATIBILITY - Works seamlessly with Raspberry Pi and DIY electronics projects
PINPOINT ACCURACY AT 40 K HZ - Industry-standard ultrasonic frequency for crystal-clear detection

The HiLetgo 16MM Ultrasonic Sensor Probe set features a 40KHz nominal frequency with a powerful ≥110dB emission sound pressure and a highly sensitive receiver at ≥-75dB. Designed as split transceiver pairs, these compact probes are perfect for professional-grade detection and DIY electronics, offering reliable performance in a lightweight 18g package.

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ASIN	B00M2GHG66
Item model number	3-01-0622
Manufacturer	HiLetgo
Package Dimensions	9.6 x 7.8 x 3.2 cm; 18 g

HiLetgo One Pair 16MM Ultrasonic Sensor Probe Split Ultrasonic Transceiver+Receiver

Description

Specifications

Common Questions