Ultrasonic Sensor

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Picture of High Precision Ultrasonic Sensor, 500-6000mm, Analog/RS485

High Precision Ultrasonic Sensor, 500-6000mm, Analog/RS485

● Measuring range 500–6000 mm ● Protection IP67 waterproof ● Operating temperature -20°C to +80°C ● Cable length 2 m

$350.59

Picture of Automotive Ultrasonic Parking Sensor, 28-450cm, UART/TTL

Automotive Ultrasonic Parking Sensor, 28-450cm, UART/TTL

● Sensing range 28–450cm ● Measurement accuracy ±(1+5×0.3%) cm ● Output PWM / UART / TTL level ● Operating voltage 3.3–12V DC

$59.41

Picture of Mini Ultrasonic Sensor with Waterproof Probe, 28-750cm, UART/RS485

Mini Ultrasonic Sensor with Waterproof Probe, 28-750cm, UART/RS485

● Output UART Auto / Ctrl / RS485 ● Voltage 5–12 V DC ● Range 28–250 cm (horn), blind zone ≤28 cm ● Accuracy ±(1 + S × 0.3%) cm, temp.-comp.

$60.35

Picture of Underwater Ultrasonic Sensor, 5-800cm/8-800cm, UART/RS485 Output

Underwater Ultrasonic Sensor, 5-800cm/8-800cm, UART/RS485 Output

● Output UART Ctrl / RS485 (selectable) ● Range 5 to 800 cm (UART), 8 to 800 cm (RS485) ● Accuracy ±(1+S×1%) cm ● Angle 15±5° (UART), 25±5° (RS485)

$69.12

Picture of Ultrasonic Detection Sensor, Double Sheet, 20-60mm, NPN/PNP

Ultrasonic Detection Sensor, Double Sheet, 20-60mm, NPN/PNP

● Outputs 3×100 mA, NPN/PNP, NO/NC ● Range 20–60 mm (opt. 45 mm) ● Response approx. 15 ms ● Protection IP67, stainless steel housing

$568.31

Picture of Ultrasonic Fork Sensor for Label Detection, NPN + PNP, NO/NC

Ultrasonic Fork Sensor for Label Detection, NPN + PNP, NO/NC

● Response time 250 µs ● Switching frequency 1.5 kHz ● Output PNP + NPN, NO/NC selectable ● Protection IP65, aluminum housing

$189.08

Picture of Rotatable Ultrasonic Distance Sensor, 40–500 mm, NPN/PNP

Rotatable Ultrasonic Distance Sensor, 40–500 mm, NPN/PNP

● Resolution 0.17 mm ● Repeatability ±0.15% FS ● Output NO/NC, serial upgrade / type change ● IP67, M12 4-pin

$498.77

Picture of Ultrasonic Presence Sensor, 28-450cm, PWM/UART

Ultrasonic Presence Sensor, 28-450cm, PWM/UART

● Output UART / PWM / Switching ● Operating voltage 3.3–5.25 V DC ● Low power <10 µA / <10 mA ● Human detection 28–450 cm

$90.62

Picture of Underwater Ultrasonic Communication Sensor, 0.1-50m, UART / RS485

Underwater Ultrasonic Communication Sensor, 0.1-50m, UART / RS485

● Output UART Controlled / RS485 ● Comm. 1–2000 cm, 360°, ≥99% ● Protocol Modbus-RTU, configurable ● Protection IP68 (5 m / 168 h)

$160.46

Picture of Ultrasonic Distance Sensor Module, 40KHz, 25cm-5m

Ultrasonic Distance Sensor Module, 40KHz, 25cm-5m

● Range up to 5 m ● Operating voltage 5 V DC ● Current 5 mA idle / 30 mA working ● Size 41 × 28.5 mm

$69.23

Picture of Robot Ultrasonic Sensor for Object Detection, Single/Dual Angle, PWM/I2C

Robot Ultrasonic Sensor for Object Detection, Single/Dual Angle, PWM/I2C

● Output UART/PWM/RS485/I²C/Digital ● Voltage 3.3–24 V DC ● Range 3–500 cm, blind ≤3 cm ● Avg ≤6 mA, standby ≤5 µA (UART Ctrl/PWM)

$108.15

Picture of Ultrasonic Tank Sensor, 400kHz, 60mm to 500mm

Ultrasonic Tank Sensor, 400kHz, 60mm to 500mm

● Sensing range 50–500 mm ● Resolution 1 mm ● Switching frequency 8 kHz ● Degree of protection IP65

$355.69

Picture of Industrial Ultrasonic Sensor, 60-1000mm, NPN/PNP Output

Industrial Ultrasonic Sensor, 60-1000mm, NPN/PNP Output

● Range 60–1000 mm, blind zone 0–60 mm ● Resolution 0.1% of range (min. 0.5 mm) ● Current ≤20 mA ● Temp. drift 0.05%/°C (built-in comp.)

$333.69

Picture of Non-contact Ultrasonic Sensor with LED Display, 30 to 250mm

Non-contact Ultrasonic Sensor with LED Display, 30 to 250mm

● Resolution ≥ 0.18 mm ● Repeat accuracy ±0.15 % ● Degree of protection IP65 / IP67 ● Operating voltage 9–30 V DC

$367.54

Picture of Long Range Ultrasonic Sensor, 200-4000mm, 4-20mA/TTL

Long Range Ultrasonic Sensor, 200-4000mm, 4-20mA/TTL

● Range 200–4000 mm (blind 0–200 mm) ● Repeat accuracy ±0.15% F.S. ● Output serial upgrade / type change ● Input type teach-in

$450.62

Picture of Ultrasonic Object Detection Sensor, 1-300cm

Ultrasonic Object Detection Sensor, 1-300cm

● Output UART / PWM / RS485 / I²C / Digital ● Voltage 3.3–12 V DC ● Range 2–300 cm, blind zone ≤2 cm ● Low power standby ≤5 µA, avg ≤9 mA

$94.68

An ultrasonic sensor is a device that uses sound waves above 20 kHz to detect how far away something is, where it is, whether it’s there, or the level of a liquid. It works by sending out sound waves and listening for the echoes, which answers a key question: “Is it there? How far is it? Where is it?” Common types include distance-measuring, switching, liquid-level, fork, and module types.

How An Ultrasonic Sensor Works

Ultrasonic sensors use sound waves above 20 kHz to detect objects without touching them. The most common way to measure distance is called time of flight (ToF): the sensor sends out a sound wave, the wave hits an object and bounces back, and the sensor records the time from sending to receiving. Then it calculates the distance using:

Distance = speed of sound × time ÷ 2

You divide by 2 because the sound wave travels there and back. The speed of sound changes with temperature, so high-precision applications need temperature compensation. Besides ToF, Doppler is used to measure speed, through-beam/fork-type sensors are used for position and counting, and ultrasonic communication is a communication application.

Ultrasonic sensor ToF timing diagram showing ultrasonic burst, echo signal, and the distance calculation formula using the speed of sound at 343 m/s.

Key Specifications

An ultrasonic sensor really has only a few specs that truly stand out — the signature parameters that set it apart from photoelectric, laser, and magnetic sensors.

Parameter	When Most Critical	Selection Guideline	Reference Examples / Typical Values
Range / Blind Zone	Long-range liquid level Long-range robot sensing Parking assist Short-range multi-sensor setups	Add 20–50% margin to the max distance The min distance must be greater than the blind zone	General modules: 2–400 cm, blind zone approx. 2 cm Industrial: 5 cm–1 m Level meters: 0.5–15 m
Beam Angle	Robot obstacle avoidance Tight spaces Multi-sensor crosstalk prevention	Choose a narrow beam when obstacles are nearby Choose a wide beam when the target position is not fixed	General modules: approx. 15° Industrial narrow beam: 5–15° General-purpose: 30–60°
Frequency	Long-range liquid level High-precision short-range ranging<	Long distance = high attenuation, choose low frequency Short distance with high precision = choose high frequency	General: 40 kHz Industrial: 40–200 kHz Level: 40–80 kHz
Response Time	Conveyor counting High-speed moving objects Rotation detection	Calculate detections per second 5,000 parts/hour ≈ 1.4 Hz; 10 Hz or higher is sufficient	General modules: 20–60 ms Industrial: 10–50 ms Switching frequency: 10–100 Hz
Temperature Compensation	High-precision ranging Liquid level Large outdoor temperature differences	Choose built-in compensation if temperature difference is large or high accuracy is required	General modules: usually none Industrial / level meters: mostly built-in

FAQ

Q: Why do ultrasonic sensors have a blind zone?

A: After transmitting, the sensor has to switch to receive mode, and the transducer is still ringing (its residual vibration hasn’t died down), so nearby echoes can’t be separated. When selecting a sensor, the minimum distance must be greater than the blind zone.

Q: How do you prevent crosstalk between multiple sensors?

A: Use time-staggered triggering, different frequencies, narrow beams, lower transmit power, and isolation barriers.

Q: Can it measure foam or steam?

A: Usually not reliably. Foam absorbs or scatters sound waves, and steam changes the speed of sound and the propagation path. Consider radar, guided-wave, or high-frequency solutions.

Q: How do you choose between ultrasonic, laser, and radar?

A: Ultrasonic is not affected by color or transparency and is good for liquid level and dirty environments, but it has slower response, a wider beam, and is affected by wind and temperature. Laser is highly accurate and fast, but struggles with transparent, black, or contaminated targets. Radar penetrates steam and foam better, but costs more.

Collage of six ultrasonic sensor applications.