HRXL-MaxSonar® - WRS™ Series
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HRXL-MaxSonar®- WRS™ Series HRXL-MaxSonar® - WRS™ Series High Resolution, IP67 Weather Resistant, Ultrasonic Snow Depth Sensor / MB7334, MB7344, MB7354, MB7364, MB7374, MB73846 The HRXL-MaxSonar-WRS sensor line is a cost-effective solution for applications where precision range-finding, low-voltage operation, space saving, low-cost, and IP67 weather resistance rating is needed. This sensor component module allows users of other, more costly precision ultrasonic snow depth measurement rangefinders to lower the cost of their systems without sacrificing performance. Additionally, this sensor line allows cost-sensitive designers to choose this precision sensor as a performance upgrade over other lower performance sensors. The HRXLMaxSonar-WRS sensor line provides high accuracy and high resolution ultrasonic proximity detection and ranging in air, 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 HRXL-MaxSonar-WRS sensors have a maximum range of 5-meters. This ultrasonic sensor detects objects from 1-mm and ranges to objects from 50-cm to maximum range. Objects closer than 50-cm are typically reported as 50-cm. The interface output formats are pulse width, analog voltage, and digital serial in either RS232 or TTL . Factory calibration is standard. Very Low Power Requirements • Sensor automatically handles Precision Ultrasonic Range acoustic noise 1,2 Sensing • Wide, low supply voltage • Small and easy to mount requirements eases battery powered • Range-finding at a fraction of the • Calibrated sensor eliminates most design cost of other precision rangefinders sensor to sensor variations • Reading-to-reading stability of 1-mm • Low current draw reduces current 1 drain for battery operation at 1-meter is typical Applications & Uses • Fast first reading after power-up • Accuracy is factory-matched • Weather station monitoring eases battery requirements providing a typical accuracy of 1% • Snow level measurement (MB7354, or better 1,2 • Very low-power rangerfinder, MB7374) excellent for multiple sensor or • Compensation provided for target • Bin level measurement battery based systems size variation and operating voltage • Corn level measurement range Easy to use Component • People detection • Internal temperature compensation is Module • This product is not recommended as standard • Gracefully handles other ultrasonic 3 a device for personal safety sensors • Optional external temperature Notes: 1 • Stable and reliable range readings compensation Users are encouraged to evaluate the sensor performance in their application and excellent noise rejection make • Determines range to first detectable 2 the sensor easy to use for most users 3 by design 7 for multi-sensor operation object See page 4 F-Option provides additional protection from hazardous • Easy to use interface with distance • Excellent clutter rejection chemical environments 5 provided in a variety of output Please reference page 12 for minimum operating voltage • Additional chemical resistance verses temperature information 4 6 available Please reference page 16 for part number key. • Target size compensation provides greater consistency and accuracy _______________________________________________________________________________________________________________________________________ Close Range Operation Applications requiring 100% reading-to-reading reliability should not use MaxSonar sensors at a distance closer than 50cm. Although most users find MaxSonar sensors to work reliably from 0 to 50cm for detecting objects in many applications, MaxBotix® Inc. does not guarantee operational reliability for objects closer than the minimum reported distance. Because of ultrasonic physics, these sensors are unable to achieve 100% reliability at close distances. _______________________________________________________________________________________________________________________________________ Warning: Personal Safety Applications We do not recommend or endorse this product be used as a component in any personal safety applications. This product is not designed, intended or authorized for such use. These sensors and controls do not include the self-checking redundant circuitry needed for such use. Such unauthorized use may create a failure of the MaxBotix® Inc. product which may result in personal injury or death. MaxBotix® Inc. will not be held liable for unauthorized use of this component. Copyright 2005 - 2012 MaxBotix Incorporated Patent 7,679,996 MaxBotix Inc., products are engineered and a

• Free run operation with superior noise rejection • Operating temperature range from -40°C to +65°C • Operating voltage from 2.7V to 5.5 V • Best operated at 5 V for snow applications • Nominal current draw of 2.3mA at 3.3 V, and 3.1mA at 5V • IP67 Rated Range Outputs • Pulse width, 1uS/mm resolution • Analog Voltage, 5-mm resolution • Serial, 1-mm resolution • Available in RS232 or TTL HRXL-MaxSonar®- WRS™ Series General Characteristics • Low cost ultrasonic rangefinder • Detection out to 5-meters • Resolution of 1-mm • Distance sensor from 50-cm to 5-meters • Excellent1 Mean Time Between...

HRXL-MaxSonar® - WRS™ Series HRXL-MaxSonar-WR Pin Out Pin 1- Temperature Sensor Connection: Leave this pin unconnected if an external temperature sensor is not used. For best accuracy, this pin is optionally connected to the HR-MaxTemp temperature sensor. Some additional information for the temperature sensor can be found on page # of the datasheet. Pin 2- Pulse Width Output: This pin outputs a pulse width representation of the distance with a scale factor of 1uS per mm. The pulse width output is sent with a value within 0.5% of the serial output. Pin 3- Analog Voltage Output: This pin...