MB7344-801 [ETC]
ULTRASONIC SENSOR HRXL-MAXSONAR;型号: | MB7344-801 |
厂家: | ETC |
描述: | ULTRASONIC SENSOR HRXL-MAXSONAR |
文件: | 总19页 (文件大小:2484K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
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 HRXL-
MaxSonar-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.
• Sensor automatically handles
acoustic noise 1,2
• Small and easy to mount
• Calibrated sensor eliminates most
sensor to sensor variations
Very Low Power Requirements
Precision Ultrasonic Range
Sensing
• Range-finding at a fraction of the
cost of other precision rangefinders
• Reading-to-reading stability of 1-mm
at 1-meter is typical1
• Accuracy is factory-matched
providing a typical accuracy of 1%
or better 1,2
• Compensation provided for target
size variation and operating voltage
range
• Internal temperature compensation is
standard
• Optional external temperature
compensation
• Determines range to first detectable
object
• Wide, low supply voltage
requirements eases battery powered
design
• Low current draw reduces current
drain for battery operation
• Fast first reading after power-up
eases battery requirements
• Very low-power rangerfinder,
excellent for multiple sensor or
battery based systems
Applications & Uses
• Weather station monitoring
• Snow level measurement (MB7354,
MB7374)
• Bin level measurement
• Corn level measurement
• People detection
Easy to use Component
Module
• This product is not recommended as
a device for personal safety
Notes:
• Gracefully handles other ultrasonic
sensors3
1 Users are encouraged to evaluate the sensor performance
in their application
• Stable and reliable range readings
and excellent noise rejection make
the sensor easy to use for most users
• Easy to use interface with distance
provided in a variety of output
• Target size compensation provides
greater consistency and accuracy
2 by design
3 See page 9 for multi-sensor operation
4 F-Option and P-Option provide additional protection
from hazardous chemical environments
5 Please reference page 12 for minimum operating voltage
verses temperature information
• Excellent clutter rejection
•
Additional chemical resistance
available4
6 Please reference page 17 for part number key.
_______________________________________________________________________________________________________________________________________
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.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
• Operating temperature range from -40°C • Serial, 1-mm resolution
General Characteristics
to +65°C
• Available in RS232 or TTL
• Low cost ultrasonic rangefinder
• Detection out to 5-meters
• Resolution of 1-mm
• Operating voltage from 2.7V to 5.5V
• Best operated at 5V for snow
applications
• Distance sensor from 50-cm to 5-meters
• Excellent1 Mean Time Between Failure
(MTBF)
• Nominal current draw of 2.3mA at 3.3V,
and 3.1mA at 5V
• IP67 Rated
• Triggered operation yields real-time
Range Outputs
• Pulse width, 1uS/mm resolution
• Analog Voltage, 5-mm resolution
range data
• Free run operation with superior noise
rejection3
About Ultrasonic Sensors
Our ultrasonic sensors are, non-contact object detection and ranging sensors that detect objects in air, within an area. These sensors are
not affected by color or other visual characteristics of the detected object. Ultrasonic sensors use high frequency sound to detect and
localize objects in a variety of environments. Ultrasonic sensors measure the time of flight for sound that has been transmitted to and
reflected back from nearby objects. Based upon the time of flight, the sensor then outputs a range reading.
HRXL-MaxSonar-WRS
The HRXL-MaxSonar-WRS is a low-cost, rugged ultrasonic snow depth sensor that is optimized for reliable snow depth
measurement. Internally, multiple sensor readings are analyzed using algorithms optimized for snow measurement, ensuring accurate
snow depth measurements. The sensor accurately applies temperature compensation to every reading, using either the integrated
temperature sensor or the optional external temperature sensor (HR-MaxTemp).
_______________________________________________________________________________________________________________________________________
HRXL-MaxSonar®-WRS™ Mechanical Dimensions
3/4” NPS WR Housing
Extended Horn
B
I
J
F
E
C
D
Pin 1
A
3.12” dia.
7.20”
6.09”
0.58”
0.31”
79.3 mm dia.
182.9 mm
154.8 mm
14.4 mm
7.9 mm
B
C
D
E
F
G
H
I
A
G
0.23”
0.10”
5.8 mm
2.54 mm
3/4” - 14 National Pipe Thread Straight
1.03” dia.
H
26.2 mm dia.
34.8 mm
J
1.37”
Weight, 1.10 oz., 31.1 grams
Values Are Nominal
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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 8 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 outputs a single ended analog voltage scaled representation of the distance.
This output is referenced to the sensor ground and Vcc. After the ~50mS power up initialization, the voltage on this pin
is set to a low voltage. Once the sensor has completed a range reading the voltage on this pin is set to the voltage
corresponding to the latest measured distance.
The HRXL-MaxSonar-WRS sensors use a scale factor of (Vcc/5120) per 1-mm. The distance is output with a 5-mm
resolution. The analog voltage output is typically within ±5-mm of the serial output.
Using a 10-bit analog to digital converter with the HRXL-MaxSonar-WRS sensors, one can read the analog voltage
counts (i.e. 0 to 1023) directly and just multiply the number of counts in the value by 5 to yield the range in mm. For
example, a converted value of 60 corresponds to 300-mm (where 60 x 5 = 300), and 1000 counts corresponds to 5,000-
mm (where 1000 x 5 = 5,000-mm).
Pin 4- Ranging Start/Stop: This pin is internally pulled high. If this pin is left unconnected or held high, the sensor will
continually measure and output the range data. If held low, the HRXL-MaxSonar-WRS will stop ranging. Bring high for
20uS or longer to command a range reading.
Filtered Range Data: When pin 4 is left high on the sensors, the sensors will continue to range. The data that is output
includes a filter for increased accuracy. The sensors will output the range based on recent range information. The filter
does not affect the speed at which data is made available to the user but instead allows for more consistent range
information to be presented. For sensor specific timing and filter information refer to pages 10 and 11.
Real-time Range Data: When pin 4 is low and then brought high, the sensor will operate in real time and the first reading
output will be the range measured from this first commanded range reading. When the sensor tracks that the RX pin is low
after each range reading, and then the RX pin is brought high, unfiltered real time range information can be obtained. For
timing information please refer to pages 10 and 11.
Pin 5-Serial Output: The MB7334, MB7354, and MB7364 sensors have an RS232 data format (with 0V to Vcc levels)
and the MB7344, MB7374, and MB7384 sensors have a TTL outputs. The output is an ASCII capital “R”, followed by
four ASCII character digits representing the range in millimeters, followed by a carriage return (ASCII 13). The
maximum range reported is 4999 mm. A range value of 5000 corresponds to no target being detected in the field of view.
The serial data format is 9600 baud, 8 data bits, no parity, with one stop bit (9600-8-N-1).
Because the data is presented in a binary data format, the serial output is most accurate .
V+ Pin 6 - Positive Power, Vcc: The sensor operates on voltages from 2.7V - 5.5V DC. For best operation, the sensor
requires that the DC power be free from electrical noise. For installations monitoring snow, powering the sensor at 5V
will provide the best results. (For installations with known dirty electrical power, a 100uF capacitor placed at the sensor
pins between V+ and GND will typically correct the electrical noise.) Please reference page 12 for minimum operating
voltage verses temperature information.
GND Pin 7 – Sensor ground pin: DC return, and circuit common ground.
_______________________________________________________________________________________________________________________________________
Package Types Currently Available
Full Horn – 3/4” NPT straight; back mounted thread
Snow Horn – 3/4” NPT straight; back mounted thread. Enhanced detection of snow.
All package types have exposed PCB on user end for easy connection. Users desiring a fully enclosed assembly may purchase the
“Shielded Cable Option” along with their sensor.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Sensor Mounting
It is recommended that several factors be taken into account when using the HRXL-MaxSonar-WRS ultrasonic snow
depth sensors.
Due to the high gain of the sensor, the first recommendation is to mount the sensor far enough away from any supporting
masts or towers. For a mast that is 5 meters high (or higher) the sensor should be mounted at least 100cm away from the
mast. For a mast that is 2.5 meters high (or lower) the sensor should be at least 75cm away from the mast. (This
corresponds to a mounting clearance angle of ≥11.3 degrees)
For users desiring the highest accuracy, it is recommended to use a properly mounted external temperature sensor.
MaxBotix Inc., is developing several components to assist in high accuracy readings and protection of the
HRXL-MaxSonar-WRS and HR-MaxTemp sensors.
The first component is a shroud that is assembled over the top of the HRXL-MaxSonar-WRS sensor housing, Figure 1.
This shroud is a UV shield for the sensor. The shroud is also acts to protect the sensor from hail, heavy snow, and snow
build up.
The second component is a louver design housing to protect the temperature sensor from direct and reflective UV rays,
Figure 2. This housing has been created to maintain a real time accurate temperature. This component is separate from the
shroud that covers the HRXL-MaxSonar-WRS.
The third component is a fan housing which is able to hold either an AC or DC cooling fan under the temperature housing,
Figure 3. This has been created for maximum airflow to the temperature sensor housing. The fan housing helps to ensure
the temperature sensor is the same temperature as the surrounding environment.
All the components listed above are designed with the intent to use standard hardware for mounting to new or existing
weather stations or other mounting components.
Figure 4 shows the recommended mounting for the HRXL-MaxSonar-WRS snow depth sensor with the HR-MaxTemp
temperature sensor.
Mounting information for the snow sensor can be found in the application note here: ww.maxbotix.com/articles/070.htm
Figure 1
Figure 2
Figure 3
Figure 4
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Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Filter
High
Recom-
mended
Application
Model Selection
Serial
5 Meter
Range
Reset Performance
Window
Part Number Interface
HR Filter1
Yes
Different applications require different sensors.
MaxBotix Inc., has made a variety of snow and high
sensitivity sensors available in order to best fit the
broad range of potential applications. Users are
encouraged to consider our other
HRXL-MaxSonar-WR products for applications
beyond snow.
MB7334
MB7344
MB7354
MB7364
MB7374
MB7384
RS232
TTL
2%
Yes
Yes
Yes
Yes
Yes
Yes
Water/Outdoors
2%
Yes
RS232
RS232
TTL
Never
N/A
Yes
Outdoors/Snow
Any
Yes
Never
N/A
Yes
Outdoors/Snow
Any
TTL
Yes
For this product series the MB7364 and
MB7384 constitute the base model. The
MB7364 and MB7384 differ only in the
serial output provided. The MB7364 has
0-Vcc RS232 serial data (inverted data
that can be fed directly into a computer
equipped with a DB9 port), and the
MB7384 has TTL serial data.
The MB7354 and MB7374 have an
additional filter on the data output for use
in outdoor applications with stationary or
slow moving targets. This filter has been
shown to improve sensor accuracy and
usability in snow depth monitoring
applications and will allow the user to get
consistent data even if the user only uses
one reading to measure distance. In
order for this filter to run the sensor must
be operated in free-run mode.
Top(red):MB7364reportingatargetmovedfrom1meterto1.1metersinalinearfashion.
Middle(green):MB7334respondingtothesametarget,noticethestepswhenthetarget
moves>2%.
Bottom(blue):MB7354respondingtoatargetmovedfrom1meterto1.1metersinalinear
fashion.
The MB7334 and MB7344 have an additional filter similar to the MB7354 and MB7374 except that the filter will reset to
targets that are considered valid outside of a 2% distance to target window. This makes the sensor an ideal balance for
accurately monitoring slow or stationary targets that occasionally move rapidly.
_______________________________________________________________________________________________________________________________________
Auto Calibration
Each time a HRXL-MaxSonar-WRS series sensor takes a range reading, it calibrates itself. The sensor then uses this data
to range objects. If the temperature, humidity, or applied voltage changes during sensor operation, the sensor will continue
to function normally over the rated temperature range while applying compensation for changes caused by temperature
and voltage.
Target Size Compensation
Most low cost ultrasonic rangefinders will report the range to smaller size targets as farther than the actual distance. In
addition, they may also report the range to larger size targets as closer than the actual distance.
The HRXL-MaxSonar-WRS sensor line compensates for target size differences. This means that, provided an object is
large enough to be detected, the sensor will report the same distance, typically within 1%, regardless of target size.
Smaller targets can have additional detection noise that may limit this feature. In addition, targets with small or rounded
surfaces may have an apparent distance that is slightly farther, where the distance reported may be a composite of the
sensed object(s). Compensation for target size is applied to all range outputs: pulse width, analog voltage, and serial
format output by the sensor.
Sensor operation from 30-cm to 50-cm
Because of acoustic effects in the near field, objects between 30-cm and 50-cm may experience acoustic phase
cancellation of the returning wave, resulting in inaccuracies of up to 5-mm. These effects become less prevalent as the
target distance increases, and have not been observed past 50-cm. For this reason, users that require the highest accuracy
are encouraged to mount the HRXL-MaxSonar-WRS farther than 50-cm away from objects.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
MB7334, MB7344 Filter – 2% distance to target filter
The MB7334 and MB7344 have a 2% distance to target
filter designed to provide more accurate information in
real-world environments. This filter improves sensor
accuracy and stability by reducing the influence of wind,
acoustic noise, thermal pockets, and other effects on the
sensor output. (This is in addition to the HR filtering
already available on the MB7364 and MB7384)
This filter can be reset at any time by bringing pin 4 (RX)
of the sensor low.
This filter is active whenever the RX pin is brought high,
all readings within a 2% distance to target window, are
collected and added to the output sent to the user using a
recent biased exponential weighted average.
The MB7334 range output when responding to a 4cm change.
Confirmed readings outside of the 2% distance to target window will cause the filter to reset. This allows the sensor to
continue functioning in a reasonable manner where high accuracy measurements are required for most of the sensor
operation and quick sensor response is required at other points of operation.
____________________________________________________________________________________________________________________________________
MB7354, MB7374 Filter
The MB7354 and MB7374 have a filter that improves sensor accuracy and stability by reducing the influence of wind,
acoustic noise, thermal pockets and other effects on the sensor output. (This is in addition to the HR filtering already
available on the MB7364 and MB7384.)
This filter can be reset at any time by bringing pin 4 (RX) of the sensor low.
This filter will initialize 40 readings (about 7 seconds) after sensor power is applied, or after the RX pin is brought high
and held high.
This filter is a recent biased exponential weighted average filter that is also rate limited to change a maximum of seven
mm per second taken and is designed to monitor stable, or slow moving objects, if a filter update is required this can be
accomplished with the RX pin.
MB7354 responding to a 1 meter change. This shows the
MB7354 responding to a 4 cenꢀmeter change. This shows the
7-mm rate limit along with the exponenꢀal ꢁlter.
7-mm rate limit along with the exponenꢀal ꢁlter.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Sensor Performance Information
Accuracy Information
Best accuracy during snow measurements is achieved when the air temperature is accurately measured midway between
the sensor and the ground. To this end MaxBotix Inc., has tested our snow sensor solution using the internal temperature
sensor, external temperature sensor and the external temperature sensor mounted in special Louvre housing with a fan.
Three million readings in each test configuration were then recorded over five days at our outside our facility with typical
temperature swings of 15C per day and the MB7354 ranging to a stable target. All of the readings fell within the 1%
tolerance in our test setup. The external temperature sensor, mounted with the special shield and fan, provided better
performance.
MB7354 with external temperature
sensor and no circulation fan
MB7354 without external temperature
sensor
MB7354 with external temperature
sensor and circulation fan
Below is a histogram, by quantity, of each reading observed.
MB7354 with External Temperature Sensor and Fan
MB7354 with External Temperature Sensor
MB7354 without External Temperature Sensor
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Supply Voltage Compensation
During power up, the HRXL-MaxSonar-WRS sensors will calibrate itself for changes in supply voltage. Additionally, the sensor will
compensate if the supplied voltage gradually changes.
If the average voltage applied to the sensor changes faster than 0.5V per second, it is best to remove and reapply power to the sensor.
For best operation, the sensor requires noise free power . If the sensor is used with noise on the supplied power or ground, the
readings may be affected. Typically adding a 100uF capacitor at the sensor between the V+ and GND pins will correct most power
related electrical noise issues.
Sensor minimum distance
The HRXL-MaxSonar-WRS sensors have a minimum reported distance of 50-cm (19.7 inches). However, the
HRXL-MaxSonar-WRS will report targets up to the sensor face. For the HRXL-MaxSonar-WRS sensors, targets closer than 500-
mm will typically range as 500-mm.
Range “0” location
The HRXL-MaxSonar-WR reports the range to distant targets from where the threading and nut meet on the sensor housing as
shown in the diagram below.
In general, the HRXL-MaxSonar-WR will report the range to the leading edge of the closest detectable object. Target detection has
been characterized in the sensor beam patterns.
_____________________________________________________________________________________________________________________________________
HRXL-MaxSonar®-WR™ Temperature Compensation
On Board – Internal Temperature Compensation
The speed of sound in air increases by 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 compensation for speed of sound changes.
The actual air temperature of the path between the sensor and the target may not match the temperature measured at the sensor itself.
Sensors can be mounted in vertical applications, or applications where the environment temperature gradient is severe. These users
may experience a temperature measurement error which will affect the sensor accuracy. For example, buildings with a height of 3-
meters can have floor to ceiling temperature variations of 5°C or more.
Because of these temperature effects, users desiring the highest accuracy output are encouraged to use a properly mounted external
temperature sensor or to manually account for this measurement error.
HR-MaxTemp, an External Temperature Sensor
Although the HRXL-MaxSonar-WR has an internal temperature sensor; for best accuracy, users are encouraged to use the optional
external temperature sensor. On power-up, the HRXL-MaxSonar-WR will automatically detect an attached HR-MaxTemp
temperature sensor and begin to apply temperature compensation using the external temperature sensor.
The external temperature sensor allows for the most accurate temperature compensation, by allowing temperature readings to be
taken that better reflect the composite temperature of the acoustic ranging path. For best results, users are encouraged to connect the
temperature sensor midway between the HRXL-MaxSonar-WR and the expected target.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
HRXL-MaxSonar-WR Sensor Operating Modes
Free-Run Operation
When operating in free run mode, the HRXL-MaxSonar-WRS sensors are designed to be used in a variety of outdoor,
industrial, or indoor situations. Many acoustic noise sources will have little to no effect on the reported range of the
HRXL-MaxSonar-WRS sensors. Most range readings are accurately reported. If the range readings are affected, the
effect is typically less than 5-mm. This allows users to employ real-time ultrasonic distance sensing without the need for
additional supporting circuitry or complicated user software.
Multiple HRXL-MaxSonar-WRS sensors can be operated in the same general locations. The internal noise filter is able
to filter out the ultrasonic noise from other HRXL-MaxSonar-WRS sensors with minimal interference. Typically, when
operating with multiple sensors, the range readings will be within ±1 cm of the actual range to the intended target.
Independent Sensor Operation
The HRXL-MaxSonar-WRS sensors have the capability to operate independently when the user desires. When using the
HRXL-MaxSonar-WRS sensors in single or independent sensor operation, it is easiest to allow the sensor to free-run.
Free-run is the default mode of operation for all of the MaxBotix Inc., sensors. The HRXL-MaxSonar-WRS sensors have
three separate outputs that update the range data simultaneously: Analog Voltage, Pulse Width, and Serial Data. Below
are diagrams on how to connect the sensor for each of the three outputs for single or independent sensor operation.
Using Multiple Sensors in a Single System
Multiple HRXL-MaxSonar-WRS sensors can be used simultaneously in the same environment with little to no
interference (cross-talk). Even so, some cross-talk may still occur for users wishing to use a large number of sensors in
the same environment.
If interference is occurring in the sensor setup please visit www.maxbotix.com/chaining for diagrams on correcting
cross-talk between sensors.
Please take note that when the HRXL-MaxSonar-WRS sensors are operating in a chaining sequence the internal free-run
filter of the sensor is disabled, and the sensor will range in real-time.
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MaxBotix® Inc.
MaxBotix Inc., products are engineered and assembled in the USA.
Copyright 2005 - 2021 MaxBotix Incorporated
Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Sensor Timing Diagrams
Power Up Timing
All parts have the same powerup timing.
Sensor Free-Run Timing
When operating in free run mode, the HRXL-MaxSonar-WRS sensors are designed to be used in a variety of outdoor,
Power up timing has
already occurred
Maximum
Refresh
Rate
Free
Run
Filter
Pulse
Width
Reported Reported
Serial
Data
Pin 4
Brought
Low
End of
Range
Cycle
Product
MB7334, MB7344, MB7354, MB7364, MB7374, MB7384
6.67Hz
1.33Hz
~135mS ~140mS
~147mS
~148mS
industrial, or indoor environments. Many acoustic noise sources will have little to no effect on the reported range of the
HRXL-MaxSonar-WRS sensors. Most range readings are accurately reported. If the range readings are affected, the effect
is typically less than 5-mm. This allows users to employ real-time ultrasonic distance sensing without the need for
additional supporting circuitry or complicated user software.
The HRXL-MaxSonar-WRS use an internal filter to process range data. This filter improves the sensor’s performance for
accuracy, noise rejection, and reading to reading stability. The filtering in the free-run operation also permits additional
acoustic and electrical noise tolerance.
On the HRXL-MaxSonar-WRS sensors, when pin 4 is left high, the sensor will continue to range, the data output includes
a filter for increased accuracy in environments with acoustic noise. The HRXL-MaxSonar-WRS sensors will output the
range based on recent range information. The filter does not affect the speed at which data is made available to the user
but instead allows for more consistent range information to be presented.
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Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
Sensor Timing Diagrams Cont.
Triggered—Real-time Operation Timing
Power up timing has
already occurred
Pulse
Width
sent
(A)
Serial
Data sent
RX Pin
set low
End of
range
cycle
(D)
Maximum
Refresh
Rate
Product
(B)
(C)
MB7334, MB7344, MB7354, MB7364,
MB7374, MB7384
6.67Hz
~135mS
~140mS
~147mS
~148mS
Real-time or triggered operation allows users to take advantage of a few functions unavailable during free run mode.
When operating in triggered mode, an unfiltered maximum refresh rate can be achieved. This triggered operation allows
users to range targets moving away from or closer to the sensor faster than 240mm per reading.
Users can enter and remain in the real-time or triggered operation by making sure that before the end each range cycle, the
voltage level on Pin 4 is set low. After the sensor has completed the last reading, then Pin 4 is brought high. When Pin 4 is
brought high, a brand new range cycle starts and the HRXL-MaxSonar-WR will output the most recent range data without
filtering.
Readings during triggered operation are less accurate than the filtered operation by approximately ±5-mm. Because the
range readings are not filtered, noise tolerance can be greatly reduced. Care should be taken to make sure that only one
sensor is sampling range at a time.
Pulse Width data sent (Colum A) - Column A shows the approximate time that the sensor starts to output the pulse
width data. The Pulse Width output time can be as short as 300uS (minimum reported distance). For 5 meter sensors, the
pulse width can take as long as 5000uS (maximum reported distance) to be sent. For 10 meter sensors the Pulse Width
can take as long as 9999uS (maximum reported distance) to be sent.
Serial data sent (Colum B) - Column B shows the approximate time during each range cycle when the serial data is
output for the sensor. Range data takes ~8mS to be reported from the serial data output.
RX Pin set low (Column C) - When operating the HRXL-MaxSonar-WR in Triggered Operation, Pin 4 is must be
brought high for a time frame greater than 20uS (0.02mS) and less than the time in Column C in the chart above. If Pin 4
remains high for a period of time greater than the value in Column C, the sensor will switch into free-run filter operation.
End of Range Cycle (Colum D) - Column D shows the approximate time each range cycle takes to complete for each
sensor.
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HRXL-MaxSonar®- WRS™ Series
Voltage vs Temperature
The graph below shows minimum operating voltage of the sensor verses temperature.
_______________________________________________________________________________________________________________________________________
HRXL-MaxSonar®-WR™ Beam Patterns
Attenuation of Ultrasound
Attenuation, specifically absorption of sound through the air, restricts the maximum range of ultrasonic rangefinders. As
sound waves travel through the air, that air absorbs some of their energy. High frequency sounds like ultrasound are often
attenuated more quickly than lower frequency sounds. In addition to frequency, relative humidity also affect attenuation.
Warm air masses with low relative humidity will typically attenuate sound waves faster. As such performance of
ultrasonic devices may be limited at low relative humidity, especially when trying to detect targets at longer ranges.
Background Information Regarding our Beam Patterns
Each HRXL-MaxSonar-WR sensor has a calibrated beam pattern. Each sensor is matched to provide the approximate
detection pattern shown in this datasheet. This allows end users to select the part number that matches their given sensing
application. Each part number has a consistent field of detection so additional units of the same part number will have
similar beam patterns. The beam plots are provided to help identify an estimated detection zone for an application based
on the acoustic properties of a target versus the plotted beam patterns.
People Sensing:
Each beam pattern is a 2D representation of the detection area of the sensor. The beam pattern is
For users that
actually shaped like a 3D cone (having the same pattern both vertically and horizontally). Beam
desire to detect
patterns for dowels are used to show the beam pattern of each sensor. Dowels are long cylindrical
people, the
targets of a given diameter. The dowels provide consistent target detection characteristics for a
given size target which allows easy comparison of one MaxSonar sensor to another MaxSonar
sensor.
detection area to
the 1-inch
diameter dowel, in
general, represents
the area that the
sensor will
For each part number, the four patterns (A, B, C, and D) represent the detection zone for a given
target size. Each beam pattern shown is determined by the sensor’s part number and target size.
reliably detect
people.
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HRXL-MaxSonar®- WRS™ Series
The actual beam angle changes over the full range. Use the beam pattern for a specific target at any given distance to
calculate the beam angle for that target at the specific distance. Generally, smaller targets are detected over a narrower
beam angle and a shorter distance. Larger targets are detected over a wider beam angle and a longer distance.
Beam Pattern Target Shapes
A 6.1-mm (0.25-inch) diameter dowel 4ft length
B 2.54-cm (1-inch) diameter dowel 4ft length
C 8.89-cm (3.5-inch) diameter dowel 4ft length
D 11-inch wide board 4ft in length moved left to right with the
board parallel to the front sensor face. This shows the
sensor’s range capability.
Corner Reflectors
Sometimes when using an ultrasonic sensor, users experience detection of unwanted objects that appear outside the
expected beam pattern. These types of detections are the result of reflectors present in the environment. Corner reflectors
can be surprisingly small, yet present a large reflection back to the sensor. Certain objects are prone to causing corner
reflections. One of the most common corner reflectors is two flat surfaces joining together to create a 90° angle. A half-
circle also acts as a similar reflector. You can learn more about corner reflectors in our Cube Corner Reflectors article.
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HRXL-MaxSonar®- WRS™ Series
MB7334-MB7344 HRXL-MaxSonar®-WRS™ Beam Pattern and Uses
The HRXL-MaxSonar-WRS is a low-cost, rugged ultrasonic snow depth sensor that is optimized for reliable snow depth
measurement. Sensor readings are optimized for snow measurement, ensuring accurate snow depth measurement
Applications and Uses
Features and Benefits
• Snow depth measurement
• Weather station monitoring
• Soft target detection
• Water
• Factory calibrated beam width
• All range outputs are active
simultaneously
• High acoustic sensitivity
• Outdoors applications
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HRXL-MaxSonar®- WRS™ Series
MB7354-MB7374 HRXL-MaxSonar®-WRS™ Beam Pattern and Uses
The HRXL-MaxSonar-WRS is a low-cost, rugged ultrasonic snow depth sensor that is optimized for reliable snow depth
measurement. Sensor readings are optimized for snow measurement, ensuring accurate snow depth measurement
Applications and Uses
Features and Benefits
• Snow depth measurement
• Weather station monitoring
• Soft target detection
• Factory calibrated beam width
• All range outputs are active
simultaneously
• High acoustic sensitivity
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Patent 7,679,996
HRXL-MaxSonar®- WRS™ Series
MB7364-MB7384 HRXL-MaxSonar®-WRS™ Beam Pattern and Uses
The HRXL-MaxSonar-WRS is a low-cost, rugged ultrasonic snow depth sensor that is optimized for reliable snow depth
measurement. Sensor readings are optimized for snow measurement, ensuring accurate snow depth measurement
Applications and Uses
Features and Benefits
• Snow depth measurement
• Weather station monitoring
• Soft target detection
• Factory calibrated beam width
• All range outputs are active
simultaneously
• High acoustic sensitivity
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HRXL-MaxSonar®- WRS™ Series
Part Numbers
All part numbers are a combination of a six-character base followed by a dash and a three-digit product code.
Please review the following table for more information on the three-digit product code.
Note: Active part numbers listed on page 18.
-
M B 7 3 X 4
1
0
0
Base
Housing
Options
Wire
0
1
No Wire
Wire Attached
0
1
2
3
4
5
6
No Options (Bagged)
F-Option
0
1
2
3
4
5
6
7
8
Not Applicable
3/4” NPS WR
3/4” NPS WRC
Ultra Compact
Ultra Compact Flush Mount
1” NPS
P-Option
F-Option and P-Option
No Options (Trayed)
TTL (Bagged)
1” BSPP
TTL (Trayed)
30MM 1.5
Extended Horn
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The following tables display all of the active and valid part numbers for these products.
Active Part Numbers for MB7334
MB7334-100 MB7334-101 MB7334-110
MB7334-800 MB7334-801 MB7334-810
MB7334-111 MB7334-120 MB7334-121 MB7334-130 MB7334-131
MB7334-811 MB7334-820 MB7334-821 MB7334-830 MB7334-831
Active Part Numbers for MB7344
MB7344-100 MB7344-101 MB7344-110
MB7344-800 MB7344-801 MB7344-810
MB7344-111 MB7344-120 MB7344-121 MB7344-130 MB7344-131
MB7344-811 MB7344-820 MB7344-821 MB7344-830 MB7344-831
Active Part Numbers for MB7354
MB7354-100 MB7354-101 MB7354-110
MB7354-800 MB7354-801 MB7354-810
MB7354-111 MB7354-120 MB7354-121 MB7354-130 MB7354-131
MB7354-811 MB7354-820 MB7354-821 MB7354-830 MB7354-831
Active Part Numbers for MB7364
MB7364-100 MB7364-101 MB7364-110
MB7364-800 MB7364-801 MB7364-810
MB7364-111 MB7364-120 MB7364-121 MB7364-130 MB7364-131
MB7364-811 MB7364-820 MB7364-821 MB7364-830 MB7364-831
Active Part Numbers for MB7374
MB7374-100 MB7374-101 MB7374-110
MB7374-800 MB7374-801 MB7374-810
MB7374-111 MB7374-120 MB7374-121 MB7374-130 MB7374-131
MB7374-811 MB7374-820 MB7374-821 MB7374-830 MB7374-831
Active Part Numbers for MB7384
MB7384-100 MB7384-101 MB7384-110
MB7384-800 MB7384-801 MB7384-810
MB7384-111 MB7384-120 MB7384-121 MB7384-130 MB7384-131
MB7384-811 MB7384-820 MB7384-821 MB7384-830 MB7384-831
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HRXL-MaxSonar®- WRS™ Series
After reviewing this datasheet, do you have any more questions?
We offer Technical Support on all of our products even if you purchased them through one of our many vendors
worldwide.
You can fill out a Technical Support form for assistance on a sensor here --> Technical Support
Not sure which sensor you need for your application?
We offer Sensor Selection Assistance, click the link here to fill out a form for support --> Sensor Selection Help
Looking for tutorials to help you get started?
Frequently Asked Questions about Our Sensors
We receive many questions about our products and services. This resource offers answers to common inquiries
we receive about our product lines and their application.
Fully Calibrated Beam Patterns
All of our sensors are factory calibrated to provide consistent beam patterns, detection zones, to fit into a wide
variety of applications. In our product lines, each model number comes with a different beam pattern that reflects
the sensitivity and the detection zone of how it sees a target. Additionally, we strive to maintain consistency be-
tween our finished products, and you will see little to no deviation between sensors of the same model. This al-
lows you to have confidence in your final application when using multiple sensors.
Understanding Range Readings
The success of an application may hinge upon knowing the exact location of a target. However, a sensor may
report one meter even if the target is not exactly one meter away from the sensor. Sensor specifications, such as
resolution, precision, and accuracy, help you to understand sensor performance.
How to Use Multiple Ultrasonic Sensors
This guide covers three ways to run your sensors in a Multiple Sensor environment and issues you may face.
Contact us now with any questions at sales@maxbotix.com or call +1-218-454-0766.
Please call during our preferred business hours of 8:00 am – 4:30 pm EST on Monday through Thursday and 8:00 am –
2:00 pm EST on Friday, or you may leave us a voicemail anytime.
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