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 20pcs TCT40-16R/T 16mm Split Ultrasonic Sensor Ultrasonic Transceiver Probe 10 Transmitters + 10 Receivers T+R Ultrasonic Sensor Set

Product ID: 168186384

🎯≥-75dB Receiver Sensitivity

📡40KHz Nominal Frequency

🔊≥110dB Emission Sound Pressure

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Description

📡 Elevate your sensing game with precision ultrasonic power!

COMPACT 16 MM DESIGN - Space-saving probes perfect for advanced industrial and scientific applications.
COMPLETE TRANSCEIVER SET - Includes 10 transmitters + 10 receivers for seamless integration and scalability.
PRECISION 40 K HZ FREQUENCY - Engineered for ultra-accurate ultrasonic detection and measurement.
HIGH IMPACT SOUND EMISSION - Delivers powerful ≥110dB sound pressure for reliable signal transmission.
SENSITIVE RECEIVER PERFORMANCE - Captures faint echoes with ≥-75dB sensitivity, ensuring sharp data accuracy.

The HiLetgo 20pcs TCT40-16R/T Ultrasonic Sensor Set features 10 transmitters and 10 receivers operating at a precise 40KHz frequency. With a robust emission sound pressure of ≥110dB and a highly sensitive receiver at ≥-75dB, this compact 16mm probe set is designed for superior ultrasonic detection in industrial and scientific environments. Perfect for professionals demanding accuracy and reliability in their sensor technology.

Specifications

ASIN	B00M2GHG66
Best Sellers Rank	#118,971 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in Ultrasonic Proximity Sensors
Customer Reviews	4.6 4.6 out of 5 stars (74)
Date First Available	July 24, 2014
Item Package Quantity	1
Item Weight	0.634 ounces
Item model number	3-01-0622
Manufacturer	HiLetgo
Package Dimensions	3.78 x 3.07 x 1.26 inches
Part Number	3-01-0622

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70.35 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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