18mm 40KHz Waterproof Ultrasonic Distance Sensor Probe
18mm 40KHz Waterproof Ultrasonic Distance Sensor Probe
18mm 40KHz Integrated Waterproof Ultrasonic Distance Measuring Probe
This compact 18mm 40KHz waterproof ultrasonic probe 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.
With 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.
Key Features
- Frequency: 40 KHz nominal operating frequency
- Housing: 18mm black aluminum shell — rugged, compact, and waterproof
- Dimensions: 18 × 12mm with 10mm pin/foot spacing
- Maximum Driving Voltage: 40V
- Operating Temperature Range: -20°C to +70°C
- Integrated RT Design: Receiver and transmitter in a single module for simplified wiring
- Emission Sound Pressure at 10V: ≥112dB (0dB = 0.02mPa)
- Receiving Sensitivity at 40KHz: ≥ -70dB (0dB = V/µbar)
- Electrostatic Capacity at 1KHz, <1V: 1800 ± 30% PF
Technical Specifications
| Parameter | Value |
|---|---|
| Nominal Frequency | 40 KHz |
| Housing Diameter | 18mm |
| Dimensions | 18 × 12mm |
| Pin Spacing | 10mm |
| Max Driving Voltage | 40V |
| Operating Temperature | -20°C to +70°C |
| Sound Pressure (10V) | ≥112dB |
| Receiving Sensitivity | ≥ -70dB |
| Electrostatic Capacity | 1800 ± 30% PF |
| Shell Material | Black Aluminum |
| Waterproof | Yes |
Common Applications
- Robotics distance sensing and obstacle avoidance
- Liquid/fluid level measurement in tanks and reservoirs
- Industrial proximity and object detection
- DIY electronics and Arduino/microcontroller projects
- Parking sensors and vehicle proximity systems
- Automated production line monitoring
Made in Mainland China.
For further reading on ultrasonic sensor technology and standards in electronics, visit the NIST Sensors Technology resource.
Frequently Asked Questions
Q: What is the operating frequency of this ultrasonic probe and why does it matter?
A: 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.
Q: Is this ultrasonic sensor compatible with Arduino or Raspberry Pi?
A: 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.
Q: What makes this probe "waterproof" and can it be used outdoors?
A: The probe features an 18mm black aluminum shell 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.
Q: What is the difference between an integrated (RT) probe and separate transmitter/receiver probes?
A: An integrated RT (Receiver-Transmitter) probe 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.