{"product_id":"18mm-40khz-waterproof-ultrasonic-distance-sensor-probe","title":"18mm 40KHz Waterproof Ultrasonic Distance Sensor Probe","description":"\n\u003ch2\u003e18mm 40KHz Integrated Waterproof Ultrasonic Distance Measuring Probe\u003c\/h2\u003e\n\u003cp\u003eThis compact \u003cstrong\u003e18mm 40KHz waterproof ultrasonic probe\u003c\/strong\u003e is engineered for precision distance measurement in demanding environments. Housed in a rugged black aluminum shell, this integrated RT (receiver\/transmitter) ultrasonic module delivers reliable, accurate sensing performance — ideal for robotics, automation systems, fluid level detection, obstacle avoidance, and industrial proximity sensing applications.\u003c\/p\u003e\n\n\u003cp\u003eWith a durable waterproof design and wide operating temperature range, this ultrasonic sensor performs consistently in outdoor, wet, or thermally variable environments. Its compact 18×12mm footprint makes it easy to integrate into tight spaces while the 10mm pin spacing ensures straightforward PCB mounting.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFrequency:\u003c\/strong\u003e 40 KHz nominal operating frequency\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHousing:\u003c\/strong\u003e 18mm black aluminum shell — rugged, compact, and waterproof\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 18 × 12mm with 10mm pin\/foot spacing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Driving Voltage:\u003c\/strong\u003e 40V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Temperature Range:\u003c\/strong\u003e -20°C to +70°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated RT Design:\u003c\/strong\u003e Receiver and transmitter in a single module for simplified wiring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEmission Sound Pressure at 10V:\u003c\/strong\u003e ≥112dB (0dB = 0.02mPa)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReceiving Sensitivity at 40KHz:\u003c\/strong\u003e ≥ -70dB (0dB = V\/µbar)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eElectrostatic Capacity at 1KHz, \u0026lt;1V:\u003c\/strong\u003e 1800 ± 30% PF\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f4f4f4;\"\u003e\n    \u003cth style=\"border:1px solid #ddd; padding:8px; text-align:left;\"\u003eParameter\u003c\/th\u003e\n    \u003cth style=\"border:1px solid #ddd; padding:8px; text-align:left;\"\u003eValue\u003c\/th\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eNominal Frequency\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e40 KHz\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eHousing Diameter\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e18mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eDimensions\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e18 × 12mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003ePin Spacing\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e10mm\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eMax Driving Voltage\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e40V\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eOperating Temperature\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e-20°C to +70°C\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eSound Pressure (10V)\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e≥112dB\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eReceiving Sensitivity\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e≥ -70dB\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eElectrostatic Capacity\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003e1800 ± 30% PF\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eShell Material\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eBlack Aluminum\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eWaterproof\u003c\/td\u003e\n    \u003ctd style=\"border:1px solid #ddd; padding:8px;\"\u003eYes\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCommon Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eRobotics distance sensing and obstacle avoidance\u003c\/li\u003e\n  \u003cli\u003eLiquid\/fluid level measurement in tanks and reservoirs\u003c\/li\u003e\n  \u003cli\u003eIndustrial proximity and object detection\u003c\/li\u003e\n  \u003cli\u003eDIY electronics and Arduino\/microcontroller projects\u003c\/li\u003e\n  \u003cli\u003eParking sensors and vehicle proximity systems\u003c\/li\u003e\n  \u003cli\u003eAutomated production line monitoring\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eFor further reading on ultrasonic sensor technology and standards in electronics, visit the \u003ca href=\"https:\/\/www.nist.gov\/topics\/sensors\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eNIST Sensors Technology resource\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the operating frequency of this ultrasonic probe and why does it matter?\u003c\/h4\u003e\n\u003cp\u003eA: This waterproof ultrasonic probe operates at \u003cstrong\u003e40KHz\u003c\/strong\u003e, which is the most widely used frequency for air-based ultrasonic distance measurement. At 40KHz, the sensor achieves a good balance between detection range, resolution, and resistance to environmental interference — making it ideal for robotics, level sensing, and proximity detection projects.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this ultrasonic sensor compatible with Arduino or Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This 40KHz integrated RT ultrasonic module is compatible with Arduino, Raspberry Pi, and most microcontrollers that support ultrasonic trigger\/echo distance measurement. With a maximum driving voltage of 40V and standard 10mm pin spacing, it integrates easily into both 3.3V and 5V systems with the appropriate driver circuit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What makes this probe \"waterproof\" and can it be used outdoors?\u003c\/h4\u003e\n\u003cp\u003eA: The probe features an \u003cstrong\u003e18mm black aluminum shell\u003c\/strong\u003e that provides waterproofing, protecting internal components from moisture, humidity, and splashing. Its operating temperature range of -20°C to +70°C means it can reliably function in outdoor environments, making it well-suited for outdoor robotics, garden automation, and outdoor level detection systems.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between an integrated (RT) probe and separate transmitter\/receiver probes?\u003c\/h4\u003e\n\u003cp\u003eA: An \u003cstrong\u003eintegrated RT (Receiver-Transmitter) probe\u003c\/strong\u003e combines both the ultrasonic transmitter and receiver into a single housing. This simplifies wiring and installation, reduces the PCB footprint, and is ideal when space is limited. Separate T\/R pairs are often used when a wider detection angle or longer range is needed. The integrated design of this 18mm probe makes it especially convenient for compact builds.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the operating frequency of this ultrasonic probe and why does it matter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This waterproof ultrasonic probe operates at 40KHz, which is the most widely used frequency for air-based ultrasonic distance measurement. At 40KHz, the sensor achieves a good balance between detection range, resolution, and resistance to environmental interference — making it ideal for robotics, level sensing, and proximity detection projects.\"}}, {\"@type\": \"Question\", \"name\": \"Is this ultrasonic sensor compatible with Arduino or Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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The integrated design of this 18mm probe makes it especially convenient for compact builds.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"18mm 40KHz Waterproof Ultrasonic Distance Sensor Probe\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/18mm-40khz-waterproof-ultrasonic-distance-sensor-probe\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"5PCS 18MM RT","offer_id":48743367573696,"sku":"14:173#5PCS 18MM RT","price":32.99,"currency_code":"USD","in_stock":true},{"title":"2PCS 18MM RT","offer_id":48743367606464,"sku":"14:29#2PCS 18MM RT","price":32.99,"currency_code":"USD","in_stock":true},{"title":"1P 18MM RT","offer_id":48743367639232,"sku":"14:10#1P 18MM RT","price":32.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/S2255c22eb6ff41bf8d4929ea0c22c9dc0.webp?v=1786147310","url":"https:\/\/vueselect.com\/products\/18mm-40khz-waterproof-ultrasonic-distance-sensor-probe","provider":"Vue","version":"1.0","type":"link"}