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HRXL-MaxSonar-WRS Ultrasonic Sensor from MaxBotix Inc.
RoHs Compliant

SCXL‑MaxSonar®‑WRS™ Sensor Line

Our industrial self-cleaning outdoor high performance ultrasonic precision rangefinders

The SCXL-MaxSonar-WRS sensor line introduces an effective self-cleaning capability designed to reduce the impact of condensation in closed or high-moisture (dew, frost, etc.) environments. This sensor is a cost-effective solution for applications where precision range-finding, low-voltage operation, space saving, low-cost, self-cleaning, and IP67 weather resistance rating is needed. This innovative sensor component module allows users of other, more costly precision rangefinders to lower the cost of their systems without sacrificing performance.

The SCXL-MaxSonar-WRS self-cleaning sensor line provides high accuracy, high resolution ultrasonic proximity detection and ranging in air, and high sensitivity with an IP67 weather resistant rating. This sensor line features 1-mm resolution, target-size and operating-voltage compensation for improved accuracy, superior rejection of outside noise sources, internal speed of sound temperature compensation and optional external speed-of-sound temperature compensation. The SCXL MaxSonar-WRS self-cleaning snow depth measurement sensors are all available with a 5-meter maximum range. Models are available with the sfollowing outputs: Pulse Width, Analog Voltage, RS232 Serial (select models) or TTL Serial (select models).


Selecting a Product

MB7534 Outdoor Ultrasonic Sensor
MB7534 Outdoor Ultrasonic Sensor

MB7534 SCXL-MaxSonar-WRS3

The SCXL-MaxSonar-WRS self‑cleaning sensor is optimized for snow level measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $199.95. More on this sensor
MB7544 Outdoor Ultrasonic Sensor
MB7544 Outdoor Ultrasonic Sensor

MB7544 SCXL-MaxSonar-WRST4

The SCXL-MaxSonar-WRST self‑cleaning sensor is a optimized for snow level measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, TTL Serial, & Pulse Width. Price each $199.95. More on this sensor
MB7554 Outdoor Ultrasonic Sensor
MB7554 Outdoor Ultrasonic Sensor

MB7554 SCXL-MaxSonar-WRS5

The SCXL-MaxSonar-WRS5 self‑cleaning sensor is the recommended sensor for snow measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $199.95. More on this sensor
MB7564 Outdoor Ultrasonic Sensor
MB7564 Outdoor Ultrasonic Sensor

MB7564 SCXL-MaxSonar-WRS

The SCXL-MaxSonar-WRS is optimized for snow depth measurement and is great for users that are writing their own filtering. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $199.95. More on this sensor
MB7574 Outdoor Ultrasonic Sensor
MB7574 Outdoor Ultrasonic Sensor

MB7574 SCXL-MaxSonar-WRST7

The SCXL-MaxSonar-WRST7 self‑cleaning sensor is the recommended sensor for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, TTL Serial, & Pulse Width. Price each $199.95. More on this sensor
MB7584 Outdoor Ultrasonic Sensor
MB7584 Outdoor Ultrasonic Sensor

MB7584 SCXL-MaxSonar-WRST

The SCXL-MaxSonar-WRST self‑cleaning sensor is a weather resistant sensor designed snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, TTL Serial, & Pulse Width. Price each $199.95. More on this sensor
The HRXL-MaxSonar-WR Sensors At a Glance

Different applications require different sensors. The SCXL‑MaxSonar‑WR self‑cleaning sensor series of outdoor sensors offer a variety of features allowing users to select the best sensor to meet their needs.

The table above shows features that exist in each of the products. To view how each sensor will function to different sized targets reference the SCXL‑MaxSonar‑WRS Beam Patterns.

The Difference Between SCXL‑MaxSonar‑WRS Sensors


MB7534 and MB7544

These sensors have a filter that will reset when targets are considered outside of a 2% distance window. This makes the sensor an ideal balance for accurately monitory slow or stationary targets that occasionally move rapidly such as grain bins.

MB7554 and MB7574

These sensors have a rate limiting filter that allows for a maximum change of 1mm per reading. This improves the sensor’s accuracy and stability by reducing the influence of interference caused by wind, acoustic noise, thermal changes, and other effects. This makes the sensor ideal for snow depth measurement even in environments with blizzard conditions.

MB7564 and MB7584

These sensors are the base model in the SCXL-MaxSonar-WRS sensor series. These sensors will update all outputs as the target’s distance changes without the influence of the two filters mentioned above.

For further help in selecting a sensor use our Ultrasonic Sensor Selection Guide
Detailed product information is available in the product datasheets

Sensor Line Specifications

  • Resolution of 1-mm
  • Self‑Cleaning transducer face
  • 42kHz ultrasonic sensor measures distance to objects
  • RoHS Compliant
  • Read from all 3 sensor outputs: Analog Voltage, Serial, Pulse Width
  • Virtually no sensor dead zone, objects closer than 30cm* typically range as 30cm*
  • Maximum Range of 5-meters (196 inches)
    (MB7560, MB7569, MB7567, MB7580, MB7589)
  • Maximum Range of 10-meters (393 inches)
    (MB7563, MB7566, MB7583, MB7586)
  • Operates from 2.7-5.5V
  • 68mA average current requirement
  • Small, light weight module
  • Designed for easy integration into your project or product
  • Operational temperature -40°C to +65°C (-40°F to +149°F)
  • Realtime automatic calibration (voltage, humidity, and ambient noise)
  • Firmware filtering for excellent noise tolerance and clutter rejection
  • Weather resistant (IP67), optional chemical resistant F-Option
  • Matches standard electrical 3/4-inch PVC pipe fittings for easy mounting (3/4-inch National Pipe Thread Straight)
  • Long narrow detection zone
  • Retail Price Range: $134.95-$174.95
  • Volume Pricing (25 or more units): Contact MaxBotix Inc.

*The 10 meter sensors have a minimum reported distance of 50cm.

Weather Resistant (IP67) Sensors, and Optional Chemical Resistance

The industrial outdoor SCXL-MaxSonar-WRS self‑cleaning sensors have a robust PVC housing designed to meet IP67 water intrusion. The sensors provide short to long distance detection and ranging with a narrow beam pattern. The SCXL‑MaxSonar‑WRS self‑cleaning outdoor ultrasonic sensors have high power output, noise rejection, auto calibration, and factory calibrated beam patterns. Users should select a sensor with their outputs of choice and reading filtering that matches their application. Models are available with analog voltage output, serial digital output, pulse width output (select models), & real-time analog envelope output (select models).

In addition to the standard SCXL-MaxSonar-WRS self‑cleaning sensors, MaxBotix Inc. has developed the F-Option for additional protection necessary in a few hazardous chemical environments. Extremely corrosive gases or liquids can degrade or compromise the operation of the sensing unit. As a result, we offer a more chemically inert seal which allows our sensors to operate in all but the harshest of chemical environments. In addition to the chemical resistance the sensor has improved performance in wet or dust environments. In addition to the chemical resistance the sensor has improved performance in wet or dust environments.

Standard Weather Resistant Models

The exposed materials of a properly mounted SCXL-MaxSonar-WR self‑cleaning sensor are: Aluminum (oxidized surface), PVC, & silicone rubber (VMQ).


The exposed materials of a properly mounted SCXL-MaxSonar-WRS self‑cleaning sensor with the F-Option added are: Aluminum (oxidized surface), PVC, & Flourosilicone (with an additional back up FEP Teflon® seal).

Additional Considerations

To ensure long term operation of the sensor, terminal connections should not be exposed to water, dust, or other chemicals. Follow proper mounting when installing your sensor. This is easily accomplished using standard PVC pipe fittings which match the provided mounting threads (3/4" National Pipe Thread Straight)  MB7950 Mounting hardware can be purchased along with your sensor.

Sensors are designed for operation in air, but may work well in many gases. Testing for proper operation is encouraged. Compensation for speed of sound changes in other gases should be applied to sensor output, this is often accomplished through a simple 2 point linear calibration.

Rugged & Reliable Outdoor Ultrasonic Sensors

The industrial SCXL‑MaxSonar‑WRS self‑cleaning sensor products are the highest quality for cost outdoor ultrasonic sensors on the market. They provide an industrial component module solution that offers easy to use outputs, weather & dust resistance, no sensor dead zone, calibrated narrow beam patterns, stable range readings, low power demands, and a host of other features detailed in the product datasheets.

The SCXL-MaxSonar-WRS self‑cleaning sensors represent an industry revolution that has already found use in a number of advanced or industrial solutions where ultrasonic sensors have not been historically considered a viable solution due to unstable readings, high cost, and high power requirements.

The Noise Filtering

The sensor dynamically adjusts its sensitivity to compensate for outside electrical & acoustic noise sources.

Internal Temperature Compensation

The speed of sound in air increases about 0.6 meters per second, per degree centigrade. Because of this, each SCXL‑MaxSonar‑WRS self‑cleaning sensor is equipped with an internal temperature sensor which allows the sensor to apply a compensation for speed of sound changes.

With the internal temperature sensor, range readings immediately (within twenty seconds) after power up are the most accurate, and this is ideal for battery applications where the sensor is powered off most of the time. As such, self heating will cause the sensor to read the actual air temperature inaccurately.

External Temperature Sensor

With the HR‑MaxTemp connected to the SCXL‑MaxSonar‑WRS self‑cleaning line of sensors,realtime automatic temperature compensation is available. The HR-MaxTemp allows the SCXL‑MaxSonar‑WRS self‑cleaning sensor to monitor the changes to air temperature while ignoring self-heating.

The SCXL‑MaxSonar‑WRS self‑cleaning sensor is designed to used alongside the HR‑MaxTemp temperature sensor. On power-up the SCXL‑MaxSonar‑WRS self‑cleaning sensor will automatically detect an attached temperature sensor and begin to apply temperature compensation for the speed of sound changes to all range outputs.

The Interface

The SCXL‑MaxSonar‑WRS self‑cleaning sensor interface was designed to be very easy and intuitive to use. The interface output formats included are pulse width output, analog voltage output, and RS232 or TTL serial output. All interfaces work without user code or complicated setup strings.

The Power Requirements

The SCXL‑MaxSonar‑WRS self‑cleaning sensor functions throughout a 2.7V to 5.5V operational voltage range.  This allows for easy integration at either 3.3V or 5V and means that users of low voltage microcontrollers, or those who wish to operate in solar or battery based systems do not have to provide an extra power supply for the sensor.

The SCXL‑MaxSonar‑WRS self‑cleaning sensors have an average current draw of ~68mA during free ranging operation.

The Controlled Narrow Beam Shape

Similar ultrasonic products may have frequent side lobe detection and can even falsely trigger on objects behind or to the sides of the sensor. The SCXL‑MaxSonar‑WRS self‑cleaning sensor offers a controlled narrow beam that is designed to reject small objects (clutter) outside of the central beam area and provides long range sensitivity without detecting frivolous or unwanted targets.

The Calibration

Each SCXL‑MaxSonar‑WRS self‑cleaning sensor is made and tested for proper operation at our facility in the USA and comes with a factory calibrated narrow beam pattern to help ensure consistent operation of the sensor even from part to part.

The SCXL‑MaxSonar‑WRS self‑cleaning sensor automatically calibrates to its environment before every range reading. This calibration includes compensation for temperature, voltage, humidity, acoustic noise, and electrical noise conditions.

The Price

This sensor is designed to be sold in volume. As a result, our customers benefit from our large production volumes and distributed engineering expenses.

Reference the product datasheets to get detailed information on how each sensor operates.

Product Documents

MB7534 DatasheetHRXL-MaxSonar-WRS3-datasheet
MB7544 DatasheetHRXL-MaxSonar-WRST4-datasheet
MB7554 DatasheetSCXL-MaxSonar-WRS5-datasheet
MB7564 DatasheetSCXL-MaxSonar-WRS-datasheet
MB7574 DatasheetSCXL-MaxSonar-WRST7-datasheet
MB7584 DatasheetSCXL-MaxSonar-WRST-datasheet
Application Notes
Sensor Selection GuideSensor Selection Guide
SCWR Chaining NotesSCXL-MaxSonar-WR Chaining
RoHS ConformityRoHS Declaration of Conformity
CE Declaration of ConformityCE Declaration of Conformity
Reliability DemonstrationMTBF Report
Quick Start GuideMaxSonar Quick Start Guide
High Resolution PicturesHigh Resolution
Product 3D Models
These 3D model files will download with a different product name.
Key ShotIGES FileACIS 7.0 FileSolid Works Part
STL FileSTEP FileParaSolid Part 
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