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HRXL‑MaxSonar®‑WR™ Released

MaxBotix Inc., continues to to expand our sensor line with our newest sensor the HRXL‑MaxSonar‑WR. This new rugged sensor line includes the standard outputs that are featured on our current sensor lines with the addition of higher resolution, greater accuracy, and temperature compensation. It also has superior noise rejection when compared to the XL‑MaxSonar‑WR. With the pin-out being the same as the current XL‑MaxSonar‑WR sensors, the HRXL‑MaxSonar‑WR is a drop in upgrade.

Now High Accuracy and Low Cost (msrp $109.95)

The HRXL-MaxSonar-WR sensor, with increased performance making it the most accurate sensor in the MaxBotix Inc., sensor lineup, features stable 1mm resolution, target size compensation, temperature compensation, supply voltage compensation, superior rejection of outside noise sources, and easy to use. Applications include, but are not limited to, level sensing for water, tanks, and bins.

Amazing Stability

The 1mm resolution is so stable, that when measuring typical objects at a distance of one meter, the readings do not change by more than 1mm. The HRXL‑MaxSonar‑WR is 100% factory calibrated and tested 100% of the time. This ensures proper sensor operation and consistent performance from sensor to sensor.

Target Size Compensation

The HRXL‑MaxSonar‑WR sensor line correctly compensates for target size differences. This means, if an object is large enough to be detected, the sensor will report the same distance regardless of target size.

Temperature Compensation

An internal temperature sensor on the HRXL‑MaxSonar‑WR sensor allows for accurate speed of sound temperature compensation. An external temperature sensor can allow more accurate measurement of the air temperature in the sensors environment. The external temperature sensor, the HR‑MaxTemp, is available as an option for $4.95 (MSRP).

Supply Voltage Compensation

Many battery powered systems suffer from changing voltage over extended periods of time, from either battery droop or charge effects. The HRXL‑MaxSonar‑WR sensor line correctly compensates for changing voltages between 2.7V to 5.5V. This means, if an object is large enough to be detected, the sensor will report the same distance regardless of supply voltage.

Noise Rejection

The noise rejection characteristics of the HRXL‑MaxSonar‑WR out performs products in its class, and will work in the presence of many more electrical or acoustic noise sources with higher amplitudes. Most range readings are accurately reported, but if the range readings are affected, the effect is typically less than 5mm.

Easy to Use

The HRXL‑MaxSonar‑WR comes with the easy to use outputs and the standard pin configuration of the previous MaxSonar products. In addition to the three standard sensor outputs of RS232 serial, Analog Voltage, and Pulse Width, there is now a TTL serial output on select models. The final assembly is a small unit that weighs 50 grams, and operates from 2.7V to 5.5V with less than 3mA current draw. The HRXL‑MaxSonar‑WR is available at for a price of $109.95 (MSRP).

About Ultrasonic Sensors

Ultrasonic sensors use high frequency sound pulses to detect and localize objects in a variety of environments. These sensors measure the time of flight for sound which has been reflected off nearby targets before returning to the sensor. Ultrasonic sensors offer a number of unique benefits over other methods for object detection including: non-contact detection, wide area of detection, and detection that is not affected by color or other visual characteristics of the target object.


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