40khz Wire Type Waterproof Ultrasonic Sensor Transmitter And Receiver

40kHz IP67 Waterproof Ultrasonic Sensor Transmitter and Receiver

The MANORSHI MSW-A1040H07TR is a compact 40kHz waterproof ultrasonic sensor designed for short-range non-contact detection applications. Its dual-use piezoelectric transducer can operate as both an ultrasonic transmitter and receiver, allowing it to emit ultrasonic pulses and detect reflected echo signals within a compatible sensing circuit.

Featuring a sealed aluminum housing, IP67 protection class and a compact 10 × 7mm cylindrical structure, this ultrasonic transceiver is suitable for proximity detection, level measurement, obstacle avoidance, robotics and industrial automation equipment exposed to dust or moisture.

The sensor operates at a center frequency of 40±1.5kHz and provides a specified detectable range of 50-200cm under the manufacturer's test conditions. Actual detection performance depends on the driving circuit, target size, target material, mounting position, ambient temperature and signal-processing method.

MSW-A1040H07TR Key Features

• Dual-use ultrasonic transducer functions as both transmitter and receiver.

• 40±1.5kHz center frequency for short-range ultrasonic sensing systems.

• Compact 10 × 7mm cylindrical housing for space-limited installations.

• IP67 enclosed construction helps protect the internal piezoelectric element from dust and temporary water exposure.

• Minimum transmitting sound pressure level of 90dB.

• 60±15° directivity at the -6dB reference point.

• Maximum input voltage of 150Vp-p at 40kHz.

• Ring time of no more than 1.8ms under the specified test circuit.

• Wide operating temperature range from -40°C to +80°C.

• Aluminum housing provides a durable mounting structure for OEM sensor assemblies.

Technical Specifications

Download the MSW-A1040H07TR PDF Datasheet

Review the official PDF datasheet for the complete product specifications, mechanical drawing, frequency-response graph, beam pattern and packing information before completing the circuit design or production approval process.

       Download MSW-A1040H07TR Datasheet    

How the 40kHz Ultrasonic Transceiver Works

The MSW-A1040H07TR is a piezoelectric ultrasonic transducer rather than a complete digital distance-sensor module. A compatible electronic circuit must generate a short 40kHz electrical burst to drive the transducer. The piezoelectric element converts this signal into ultrasonic sound waves that travel toward the target.

After transmitting the ultrasonic burst, the circuit switches to receiving mode. When the sound wave reaches an object, part of the energy is reflected toward the transducer. The transducer converts the returning echo into a weak electrical signal that must be amplified, filtered and processed by the external control circuit.

A time-of-flight system estimates distance by measuring the round-trip travel time of the ultrasonic pulse. The basic calculation is distance equals the speed of sound multiplied by the measured round-trip time and divided by two.

Temperature compensation may be required in applications where measurement accuracy is important because the speed of sound in air changes with ambient temperature.

Typical Applications of the Waterproof Ultrasonic Sensor

• Short-range non-contact distance measurement.

• Liquid or solid-material level detection above a target surface.

• Industrial automation and process-control equipment.

• Proximity detection and presence sensing.

• Obstacle avoidance for robots and autonomous equipment.

• Parking, reversing and collision-warning systems.

• Automatic doors, access-control devices and elevator equipment.

• Outdoor monitoring devices exposed to dust or moisture.

• OEM ultrasonic ranging systems requiring a miniature sealed transducer.

Suitable Targets and Detection Conditions

Ultrasonic sensing performance depends strongly on the target. Large, flat and rigid surfaces positioned perpendicular to the acoustic beam generally produce stronger echoes than small, curved, soft or angled objects.

Metal plates, rigid plastic panels, walls and calm liquid surfaces are generally easier to detect than foam, fabric, irregular materials or objects that absorb or scatter sound energy. The detectable range should therefore be verified using the actual target and finished enclosure.

Wind, turbulence, rain, condensation, temperature gradients and nearby reflecting structures can affect the received waveform. Software filtering, multiple measurements and temperature compensation may improve system stability.

IP67 Protection and Environmental Limitations

The enclosed aluminum housing and IP67 protection class make this waterproof ultrasonic transducer suitable for equipment exposed to dust, humidity, splashing water and temporary water exposure under the applicable test conditions.

IP67 does not automatically mean that the sensor is suitable for continuous underwater operation. This model is primarily intended to transmit and receive ultrasonic energy through air. Continuous immersion, underwater ranging, aggressive chemicals, high-pressure cleaning or corrosive environments require separate validation and may require a dedicated underwater ultrasonic transducer.

The protection level of the completed assembly also depends on the mounting interface, sealing material, PCB protection, enclosure design and treatment of the electrical terminals.

Electrical Drive and Signal-Processing Requirements

This 40kHz ultrasonic sensor requires an external driver, receiving amplifier and signal-processing circuit. It should not be connected directly to an Arduino, PLC or microcontroller input as though it were a complete ultrasonic module.

• Generate a controlled burst close to the specified 40kHz center frequency.

• Keep the peak-to-peak drive voltage within the specified maximum limit.

• Allow sufficient blanking time after transmission before evaluating the received echo.

• Use amplification and band-pass filtering appropriate for the weak echo signal.

• Protect the receiving stage from the higher-voltage transmitting pulse.

• Include temperature compensation when measurement accuracy is critical.

• Validate the complete circuit across the specified operating-temperature range.

Understanding Ring Time and Minimum Detection Distance

Ring time describes how long the piezoelectric element continues vibrating after the electrical drive signal stops. During this decay period, the residual vibration can mask weak echoes returning from very close targets.

The specified ring time of no more than 1.8ms was measured using the stated Elmos 524.09 test condition. The practical blind zone and minimum detection distance depend on the drive amplitude, number of transmitted cycles, mechanical mounting, receiver recovery time and detection algorithm.

Engineers should verify the minimum working distance in the finished sensing system rather than relying on the transducer specification alone.

Directivity and Sensor Installation

The specified 60±15° directivity at -6dB describes the approximate acoustic detection field. Targets positioned near the center axis normally produce a stronger echo than targets located near the edge of the ultrasonic beam.

• Aim the sensor face toward the expected target area.

• Keep the front surface free from adhesive, paint, labels and sealing compounds.

• Avoid recessing the transducer deeply behind a narrow opening that may restrict or reflect the acoustic beam.

• Keep nearby brackets and enclosure walls outside the primary sensing path where possible.

• Minimize mechanical stress on the housing and terminal pins.

• Prevent water droplets, ice or heavy contamination from accumulating on the sensing surface.

• Test for false echoes after installation inside the final enclosure.

Waterproof Ultrasonic Sensor vs Open-Type Ultrasonic Sensor

Mechanical Dimensions and Mounting

The MSW-A1040H07TR has a nominal housing diameter of 10mm and a body height of 7mm. According to the mechanical drawing, the two terminal pins have different specified lengths, and the pin diameter is approximately 0.6mm.

Use the official mechanical drawing when designing the PCB hole spacing, fixture, housing opening or production tooling. Avoid applying excessive soldering heat or mechanical load to the pins and sealed rear surface.

Standard Packing Information

Ultrasonic Sensor Selection Checklist

Before selecting this waterproof ultrasonic transmitter and receiver for an OEM project, confirm the following requirements:

• Required operating frequency and frequency tolerance.

• Minimum and maximum detection distance.

• Target size, shape, angle and surface material.

• Required acoustic beam angle and sensing coverage.

• Available driving voltage and circuit topology.

• Acceptable ring time and minimum blind zone.

• Operating temperature and humidity.

• Dust, water, chemical and corrosion exposure.

• Housing dimensions, PCB layout and mounting method.

• Sample-testing and mass-production consistency requirements.

MANORSHI Waterproof Ultrasonic Sensor Support

MANORSHI supplies waterproof ultrasonic sensors, open-type ultrasonic transducers, high-frequency ultrasonic sensors, parking sensors and ultrasonic sensing modules for industrial and electronic applications.

Buyers can review additional models in the    waterproof ultrasonic sensor range    or explore the complete    ultrasonic sensor product category.

When requesting a quotation or engineering sample, provide the required quantity, target detection range, target material, operating environment, driving circuit, mounting dimensions and any terminal or marking requirements.

       Request a Quote or Engineering Sample    

Frequently Asked Questions

Is the MSW-A1040H07TR an ultrasonic transmitter or receiver?

It is a dual-use 40kHz ultrasonic transducer that can function as both a transmitter and receiver. A compatible circuit first drives the transducer to emit an ultrasonic pulse and then switches to receiving mode to detect the returning echo.

Is this waterproof ultrasonic sensor a complete distance-measuring module?

No. It is a piezoelectric ultrasonic transducer component. It requires an external 40kHz driver, transmit-receive switching circuit, amplifier, filter and signal-processing controller to form a complete distance-measurement system.

What is the detection range of the 40kHz ultrasonic transceiver?

The datasheet specifies a detectable range of 50-200cm under the manufacturer's test conditions. The actual range can change according to target size, material, angle, drive voltage, receiving circuit, ambient temperature and installation structure.

Can an IP67 ultrasonic sensor operate continuously underwater?

IP67 provides protection against dust and temporary water exposure under defined test conditions, but it does not confirm suitability for continuous underwater ranging. The MSW-A1040H07TR is primarily an air-coupled ultrasonic transducer. Underwater applications require a purpose-designed underwater sensor and separate validation.

Can the ultrasonic transducer connect directly to an Arduino?

It should not be connected directly like a digital ultrasonic module. An Arduino or other microcontroller can control the sensing process, but an appropriate driver circuit, transmit-receive switch, receiving amplifier and protection circuit are required between the microcontroller and the transducer.

What does the 150Vp-p maximum input voltage mean?

It is the specified maximum peak-to-peak drive voltage at 40kHz. The normal operating drive should be selected according to the circuit design and required acoustic output while remaining safely below the maximum limit.

Why is ring time important in ultrasonic distance measurement?

Ring time affects how quickly the transducer stops vibrating after transmission. A long decay period can mask echoes from nearby objects and increase the minimum measurable distance. This model has a specified ring time of no more than 1.8ms under the stated test condition.

Can the sensor measure a liquid level?

It can be used in an air-coupled ultrasonic level-measurement system positioned above the liquid surface. The sensor should not normally be submerged. Foam, vapor, condensation, turbulence and an uneven liquid surface may reduce echo stability and should be tested in the actual tank.

What objects are difficult for ultrasonic sensors to detect?

Small, soft, porous, curved or sharply angled targets may absorb or redirect ultrasonic energy. Fabric, foam and irregular surfaces may return weaker echoes than large, flat and rigid objects.

What is the beam angle of this waterproof ultrasonic sensor?

The specified directivity is 60±15° at the -6dB reference point. Actual sensing coverage depends on the target, mounting structure, drive conditions and signal-detection threshold.

How should I request a sample or quotation?

Provide the model number MSW-A1040H07TR, required quantity, application, target distance, target material, operating temperature, installation drawing and circuit requirements. Sample evaluation in the finished system is recommended before mass production.