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RoHs Compliant

4-20HR‑MaxSonar®‑WR™ Sensor Line

Our industrial outdoor high performance ultrasonic precision rangefinders

The industrial high resolution outdoor 4-20HR-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 4-20HR-MaxSonar-WR 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 in a 4-20mA or a 20-4mA output. On the 4-20mA output, 4mA is the minimum reported distance with 20mA being the maximum reported range. The 20-4mA outputs have this signal reversed.

 

Selecting a Product

 
MB7460 Outdoor Ultrasonic Sensor
MB7460 Outdoor Ultrasonic Sensor

MB7460 4-20HR-MaxSonar-WR

The 4-20HR-MaxSonar-WR is a weather resistant sensor that features the industrial standard 4-20mA analog current output.   More on this sensor
MB7469 Outdoor Ultrasonic Sensor
MB7469 Outdoor Ultrasonic Sensor

MB7469 4-20HR-MaxSonar-WRM

The 4-20HR-MaxSonar-WRM ignores smaller targets and only reports the range to target with the largest acoustic return. This sensor has an 4-20mA signal, where 4mA is the minimum reported distance. More on this sensor
MB7480 Outdoor Ultrasonic Sensor
MB7480 Outdoor Ultrasonic Sensor

MB7480 4-20HR-MaxSonar-WRI

The 4-20HR-MaxSonar-WR is a weather resistant sensor that features the industrial standard 4-20mA analog current output. This sensor has an inverted 4-20mA signal, where 20mA is the minimum reported distance. More on this sensor
MB7489 Outdoor Ultrasonic Sensor
MB7489 Outdoor Ultrasonic Sensor

MB7489 4-20HR-MaxSonar-WRMI

The 4-20HR-MaxSonar-WRMI ignores smaller targets and only reports the range to target with the largest acoustic return. This sensor has an inverted 4-20mA signal, where 20mA is the minimum reported distance. More on this sensor
 

Sensor Line Specifications

 
  • Resolution of ~1.6 mm
  • Analog current output of 4-20mA
  • 8Hz read rate
  • 42kHz ultrasonic sensor measures distance to objects
  • RoHS compliant
  • CE compliant
  • Internal or external temperature compensation
  • Virtually no sensor dead zone, objects closer than 50cm range as 50cm
  • Maximum Range of 5-meters (196 inches)
  • Operates from 10V-32VDC
  • <40ma 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)
  • Real time 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: $199.95
  • Volume Pricing (25 or more units): Contact MaxBotix Inc.

The industrial outdoor 4-20HR-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 4‑20HR‑MaxSonar‑WR outdoor ultrasonic sensors have high power output, noise rejection, auto calibration, and factory calibrated beam patterns.

In addition to the standard 4-20HR-MaxSonar-WR exposed material, 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 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 4-20HR-MaxSonar-WR sensor are: Aluminum (oxidized surface), PVC, and silicone rubber (VMQ).

F-Option

The exposed materials of a properly mounted 4-20HR-MaxSonar-WR sensor with the F-Option added are: Aluminum (oxidized surface), PVC, and Flourosilicone (with an additional backup FEP Teflon® seal).

Additional Considerations

Terminal connections should not be exposed to water, dust, or other chemicals to ensure long term operation of the sensor. 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 with your sensor.

The 4-20HR-MaxSonar-WR 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 4-20HR‑MaxSonar‑WR products are the highest quality ultrasonic sensors designed for non-protected environments for the cost 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 4-20HR‑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 and high cost.

Noise Filtering

The sensor dynamically adjusts its sensitivity to compensate for outside electric and 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 4-20HR‑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 20 seconds) after power up are the most accurate, which ideal for battery applications where the sensor is often powered off. The self heating (15mW at 5V, or 8mW at 3.3V) will change the temperature of the sensor by approximately 3 degrees C. (The amount of self heating is also slightly dependent on 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 4-20HR‑MaxSonar‑WR line of sensors, real time automatic temperature compensation is available. The HR-MaxTemp allows the 4-20HR‑MaxSonar‑WR sensor to monitor the changes to air temperature while ignoring self-heating.

The 4-20HR‑MaxSonar‑WR is designed to be used with the HR‑MaxTemp temperature sensor. On power‑up the 4-20HR‑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 4-20HR‑MaxSonar‑WR interface was designed to be easy and intuitive to use. The interface format is the industrial 4-20mA analog current output. This interface is designed to work without complicated user code or setup strings.

Power Requirements

The 4-20HR‑MaxSonar‑WR functions throughout a 10V to 30VDC operational voltage range.  This allows for easy integration in industrial or high voltage systems.

The 4-20HR‑MaxSonar‑WR sensors have a less than 40mA current draw (18mA + output current of 4mA to 20mA) during free ranging operation.

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 4-20HR‑MaxSonar‑WR offers a controlled narrow beam 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 4-20HR‑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 4-20HR‑MaxSonar‑WR automatically calibrates to its environment before every range reading. This calibration includes compensation for temperature, voltage, humidity, acoustic noise, and electric 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.

 
Author: Cody Carlson  Date: 08-02-2016
Raspberry Pi 2 board MaxSonar sensors offer a variety of outputs including TTL serial data. This tutorial guides you through the process of setting up your Raspberry Pi 3 with a MaxBotix sensor. Click here for full article.
Author: Scott Wielenberg  Date: 07-26-2016
Full Horn Housing MaxBotix offers an expanded range of packaging options for many of our sensors. Each option provides unique benefits to certain mounting integrations. This article provides a brief overview of each option.
Click here for full article.
Author: Scott Wielenberg  Date: 07-18-2016
Sensor is Tested When providing support, our technical support team may determine that further testing at our facility is the best way to help resolve the issue that you are facing. At this point, they will start the Return Merchandise Authorization (RMA) process. This article will explain what you can expect as your ultrasonic sensor travels through our RMA process.
Click here for full article.
Author: Scott Wielenberg  Date: 07-11-2016
Typical Wall Pipe Many customers have requested the option to mount an ultrasonic sensor in a pipe. During the testing and development cycle, we discovered a number of considerations and requirements that must be met for the application to be successful. When all of these are met, a user may be able to achieve the desired level of success for measuring the liquid level inside of a pipe.
Click here for full article.
Author: Jenney Grover  Date: 06-28-2016
one of the options for outputs On April 19th, we welcomed our supporters to join us for the Grand Opening of the Build Out. Bob and Nita Gross gave a tour of the build out and their vision for the space. We continue to be in awe of the support from our community, our employees, our distributors, and our customers. Thank you for the many years of support, and we look forward to serving you in the years to come.
Click here for full article.
 
 
 
 
 
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