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 TCT40-16R/T 16mm スプリット超音波センサー超音波トランシーバープローブ送信機10個 + 受信機10個 T+R 超音波センサーセット 20個

HiLetgo TCT40-16R/T 16mm スプリット超音波センサー超音波トランシーバープローブ送信機10個 + 受信機10個 T+R 超音波センサーセット 20個

Product ID: 726095941

📉≥-75dB Reception Sensitivity

📡40 KHz Nominal Frequency

🔊≥110dB Radiation Pressure @10V

€ 49.29

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📡 Elevate your sensing game with precision ultrasonic power!

COMPLETE 20 PIECE SET - Includes 10 transmitters + 10 receivers for seamless integration and scalability.
PRECISION 40 K HZ FREQUENCY - Engineered for ultra-accurate ultrasonic detection and measurement.
COMPACT LIGHTWEIGHT DESIGN - Slim 16mm probes weighing just 18g, perfect for sleek, professional projects.
HIGH RADIATION PRESSURE OUTPUT - Delivers powerful signal strength at ≥110dB for reliable transmission.
SENSITIVE RECEPTION CAPABILITY - Receives faint echoes with ≥-75dB sensitivity, ensuring sharp detection.

The HiLetgo TCT40-16R/T is a 20-piece ultrasonic sensor set featuring 10 transmitters and 10 receivers operating at a nominal 40 KHz frequency. With a high radiation pressure output of ≥110dB and reception sensitivity of ≥-75dB, these compact 16mm probes deliver precise and reliable ultrasonic detection, ideal for advanced sensing applications without the need for batteries.

Specifications

ASIN	B00M2GHG66
Amazon.co.jp での取り扱い開始日	2014/8/27
おすすめ度	4.6 5つ星のうち4.6 (73) var
メーカー	HiLetgo
メーカーにより製造中止になりました	いいえ
商品の重量	18 g
梱包サイズ	9.6 x 7.8 x 3.2 cm; 18 g
部品番号	3-01-0622
電池付属	いいえ
電池使用	いいえ

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