Follow MaxBotix:
Ask A Question
HRXL-MaxSonar-WRS Ultrasonic Sensor from MaxBotix Inc.
 
RoHs Compliant

HRXL‑MaxSonar®‑WRS™ Sensor Line

Our industrial outdoor high performance ultrasonic precision rangefinders

The industrial high resolution outdoor HRXL-MaxSonar-WRS sensors have a robust PVC housing designed to meet IP67 water intrusion. Theses sensors provide reliable measurements for snow depth and liquid level applications. The HRXL-MaxSonar-WRS outdoor ultrasonic sensors have high power output, noise rejection, auto calibration, temperature compensation, and factory calibrated beam patterns. Users should select a sensor with their outputs of choice and that matches their application. Models are available with the following outputs: pulse width, analog voltage output, RS232 Serial output (select models) or TTL Serial output (select models).

 

Selecting a Product

 
MB7334 Outdoor Ultrasonic Sensor
MB7334 Outdoor Ultrasonic Sensor

MB7334 HRXL-MaxSonar-WRS3

The HRXL-MaxSonar-WRS is a weather resistant sensor that is optimized for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $149.95. More on this sensor
MB7344 Outdoor Ultrasonic Sensor
MB7344 Outdoor Ultrasonic Sensor

MB7344 HRXL-MaxSonar-WRST4

The HRXL-MaxSonar-WRST is a weather resistant sensor that is optimized for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, TTL Serial, & Pulse Width. Price each $149.95. More on this sensor
MB7354 Outdoor Ultrasonic Sensor
MB7354 Outdoor Ultrasonic Sensor

MB7354 HRXL-MaxSonar-WRS5

The HRXL-MaxSonar-WRS is a weather resistant sensor that is optimized for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $149.95.  More on this sensor
MB7364 Outdoor Ultrasonic Sensor
MB7364 Outdoor Ultrasonic Sensor

MB7364 HRXL-MaxSonar-WRS

The HRXL-MaxSonar-WRS is a weather resistant sensor that is optimized for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, RS232 Serial, & Pulse Width. Price each $149.95.  More on this sensor
MB7374 Outdoor Ultrasonic Sensor
MB7374 Outdoor Ultrasonic Sensor

MB7374 HRXL-MaxSonar-WRST7

The HRXL-MaxSonar-WRS is a weather resistant sensor that is optimized for snow depth measurement. This sensor has a maximum range of 5 meters. Outputs are: Analog Voltage, TTL Serial, & Pulse Width. Price each $149.95.  More on this sensor
MB7384 Outdoor Ultrasonic Sensor
MB7384 Outdoor Ultrasonic Sensor

MB7384 HRXL-MaxSonar-WRST

The HRXL-MaxSonar-WRST 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 $149.95.  More on this sensor
 
The HRXL-MaxSonar-WRS Sensors At a Glance
 
Serial
Output
Format
RS232
TTL
RS232
RS232
TTL
TTL
Filter
Reset
Window
2%
2%
Never
N/A
Never
N/A
 
HR Filter
Yes
Yes
Yes
Yes
Yes
Yes
Reco-
mmended
Use
Water
Water
Snow
Any
Snow
Any
 
Max
Range
4999
4999
4999
4999
4999
4999
 

Different applications require different sensors. The HRXL‑MaxSonar‑WRS 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 HRXL‑MaxSonar‑WRS Beam Patterns.

HRXL‑MaxSonar‑WRS Sensor Differences

 

MB7334 and MB7344

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 monitoring slow or stationary targets that occasionally move rapidly such as water tanks.

MB7354 and MB7374

These sensors have a rate limiting filter that allows for a maximum change of 7mm per second. 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.

MB7364 and MB7384

These sensors are the base model in the HRXL-MaxSonar-WRS sensor series. These sensors will update all outputs in real-time as the target’s distance changes.

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
  • 6Hz read rate
  • Internal temperature compensation
  • 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 50cm range as 50cm
  • Maximum Range of 5-meters (196 inches)
  • Operates from 2.7-5.5V
  • Low 3.1mA 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
  • Volume Pricing (100 or more units): Contact MaxBotix Inc.

Weather Resistant (IP67) Sensors, and Optional Chemical Resistance

The industrial outdoor HRXL-MaxSonar-WR 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 HRXL‑MaxSonar‑WR 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, pulse width output, & serial digital output (RS232 or TTL).

In addition to the standard HRXL-MaxSonar-WR, 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.

Standard Weather Resistant Models

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

F-Option

The exposed materials of a properly mounted HRXL-MaxSonar-WR 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 HRXL‑MaxSonar‑WR 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 HRXL-MaxSonar-WR 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 HRXL‑MaxSonar‑WR 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. The self heating (15mW at 5V, or 8mW at 3.3V) will change the temperature of the sensor by 3 degrees C or so. (The amount of self heating is also slightly dependent upon user mounting). 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 HRXL‑MaxSonar‑WR line of sensors, realtime automatic temperature compensation is available. The HR-MaxTemp allows the HRXL‑MaxSonar‑WR sensor to monitor the changes to air temperature while ignoring self-heating.

The HRXL‑MaxSonar‑WR is designed to used alongside the HR‑MaxTemp temperature sensor. On power-up the HRXL‑MaxSonar‑WR 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 HRXL‑MaxSonar‑WR 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 HRXL‑MaxSonar‑WR 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 HRXL‑MaxSonar‑WR sensors have a 3.1mA average current draw 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 HRXL‑MaxSonar‑WR 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 HRXL‑MaxSonar‑WR 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 HRXL‑MaxSonar‑WR 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

 
MB7334 DatasheetHRXL-MaxSonar-WRS3-datasheet
MB7344DatasheetHRXL-MaxSonar-WRST4-datasheet
MB7354 DatasheetHRXL-MaxSonar-WRS5-datasheet
MB7364 DatasheetHRXL-MaxSonar-WRS-datasheet
MB7374 DatasheetHRXL-MaxSonar-WRST7-datasheet
MB7384 DatasheetHRXL-MaxSonar-WRST-datasheet
 
Application Notes
 
Sensor Selection GuideSensor Selection Guide
Snow Sensor MountingRecommended mounting guide
HRWR Chaining NotesHRXL-MaxSonar-WRS 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 Pictures.zip
 

Product 3D Models

 
Full Horn Housing
 
Key ShotIGES FileACIS 7.0 FileSolid Works Part
STL FileSTEP FileParaSolid Part 
 
 
 
 
 
 
 
Signup for notification of our exciting new products and periodic new letters. We are excited to provide the latest information from MaxBotix Inc.