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MaxBotix Inc., designs and manufactures ultrasonic sensors for a wide variety of applications and has been driving innovation in the ultrasonic sensor industry for the last 10 years. Our ultrasonic sensors are made in America and shipped worldwide from our 22,000 square foot manufacturing facility in Minnesota, USA.

Integrity & Excellence. Customer satisfaction is our first priority — including product selection, design, development, ordering, shipping, and technical support. Ordering is easy through our online store or customers can purchase from one of our many distributors worldwide. MaxBotix Inc., offers hundreds of easy-to-use ultrasonic distance sensors across 18 product lines.

4-20mA Ultrasonic Level Sensor


Easy to Install

The 4-20HR-MaxSonar-WR ultrasonic 4-20mA sensor manufactured by MaxBotix Inc., is available in multiple packages to simplify mounting. The different types are the 1” NPS, 1” BSPP, and 30mm 1.5 pipe thread housing along with our 3/4” NPS WR and WRC housing packages.

The 4-20mA ultrasonic level sensor can run on a long cable for installation that separate the sensor from the control device. This simplifies the ability to monitor multiple sensors from a central control device.

Industrial Performance

The 4-20mA ultrasonic range finders are available with a high resolution output that steps in 1.6mm increments. The 4-20mA ultrasonic range finders have a maximum range of 5 meters and published accuracy that is typically 1% or better for distance to target.

These sensors are housed in a rugged IP67 package for durability to back the published MTBF of 200,000+ hours. There are chemical resistant upgrades so the sensor can be operated in chemical environments.

Sensors accept power between 10V and 32VDC.

Single Qualification

The 4-20mA ultrasonic sensors from MaxBotix Inc. have a factory matched performance to ensures that there is little if any part-to-part variance. The 4-20mA ultrasonic sensors only need a single qualification in an application because these sensors are factory matched and calibrated.

Once a sensor is qualified, end user customization is removed. All of our 4-20mA ultrasonic sensors perform the same; simply program your function into the control device. Installation is simple because time is not wasted manually configuring each sensor.


  • Designed to match or exceed performance of other designs
  • Our business model is designed to save money
  • Sensor price is given upfront
  • Ultrasonic sensors is what we do
  • Support from business experts
  • Matched performance, test once and deploy thousands
  • 200,000+ hour MTBF
  • 100% calibration and testing
  • Made in the USA
  • Thousands shipped each week
  • Easy to order
  • Direct manufacturer support
4-20HR-MaxSonar-WR family
MaxBotix Inc. Launches a High Performance 4-20mA Output Ultrasonic Sensor

The new 4-20HR-MaxSonar-WR sensors are high accuracy ultrasonic sensors featuring a 4-20mA output. These sensors are a low cost, IP67 rated drop-in replacement for use with existing PLC/process control systems. The sensors offer superior rejection of outside noise sources and feature speed of sound temperature compensation.
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