HRXL-MaxSonar
®
- WR/WRC
™
Series
HRXL-MaxSonar - WR Series
High Resolution, Precision, IP67 Weather Resistant, Ultrasonic Range Finder
MB7360, MB7363, MB7366, MB7367, MB7369, MB7380, MB7383, MB7386, MB7387, MB7389
8
®
™
The HRXL-MaxSonar-WR sensor line is a cost-effective solution for applications requiring
precision range-finding, low-voltage operation, space saving, low-cost, and IP67 rating for weather
resistance.
The HRXL-MaxSonar-WR sensor line provides high accuracy and high resolution ultrasonic proximity
detection and ranging in air. 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-WR/WRC models are available
in 5-meter or 10-meter models. This ultrasonic sensor detects objects from 1-mm and ranges to objects from 30-cm* to
maximum range. Objects closer than 30-cm* are typically reported as 30-cm*. The interface output formats are pulse
width, analog voltage, and digital serial in either RS232 (MB7360 series) or TTL (MB7380 series). Factory calibration
is standard.
*For select sensors this distance is 50-cm, refer to pages 4 and 5.
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 typical
1
•
Accuracy is factory-matched
providing a typical accuracy of 1%
or better
1,2
•
Internal temperature compensation is
standard and optional external
temperature compensation
•
Determines range to largest object
(MB7369 , MB7389)
5.5V requirements eases battery
powered design
•
Low current draw reduces current
drain for battery operation
•
Very low-power rangerfinder,
excellent for multiple sensor or
battery based systems
Applications & Uses
•
Tank level measurement
(MB7369 or MB7389)
Easy to Use Component
Module
•
Gracefully handles other ultrasonic
sensors
5
•
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 outputs
•
Target size compensation provides
greater consistency and accuracy
•
Sensor automatically handles
acoustic noise
2,4
•
Calibrated sensor eliminates most
sensor to sensor variations
•
•
•
•
•
•
•
•
•
•
•
1
•
Determines range to first detectable
object
(MB7360, MB7363, MB7366, MB7367,
MB7380, MB7383, MB7386, MB7387)
Weather station monitoring
Bin level measurement
Proximity zone detection
People detection
Robot ranging sensor
Long range object detection
Environments with acoustic and
electrical noise
Height monitors
Auto sizing
Box dimensions
Automated factory systems
Notes:
Refer to section that compares WR to alternative
housings on page 4
2
Users are encouraged to evaluate the sensor performance
in their application
3
Reference pages 8-9 for part specific timing information
4
by design
5
See page 6 for multi-sensor operation
6
F-Option provides additional protection from hazardous
chemical environments
7
Please reference page 10 & 11 for minimum operating
voltage verses temperature information
8
Please reference page 18 for part number key
•
Excellent clutter rejection
•
Additional chemical resistance
available
6
Very Low Power
Requirements
•
Fast first reading after power-up
eases battery requirements
•
Wide, low supply voltage of 2.7V to
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.
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 1
Web:
www.maxbotix.com
PD11500s
HRXL-MaxSonar
®
- WR/WRC
™
Series
General Characteristics
•
Low cost ultrasonic rangefinder
•
Detection out to 5-meters or
10-meters
•
Resolution of 1-mm
•
Distance sensor from 30-cm to
5-meters or 50-cm to 10-meters
based on model
•
Excellent
2
Mean Time Between
Failure (MTBF)
•
Triggered operation yields real-time
range data
•
Free run operation with superior
noise rejection
3
•
Operating temperature range
from -40°C to +65°C
7
•
Operating voltage of 2.7V to 5.5V
7
•
Nominal current draw of 2.3mA
(peak ~49mA) at 3.3V, and 3.1mA
(peak ~98mA) at 5V
•
IP67 Rated
Range Outputs
•
Pulse width, 1uS/mm resolution
•
Analog Voltage, 5-mm resolution
(5-meter sensors)
•
Analog Voltage, 10-mm resolution
(10-meter sensors)
•
Serial, 1-mm resolution
•
Available in RS232 (MB7360
series) or TTL (MB7380 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 10 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 5-meter sensors (MB7360, MB7369, MB7380, and MB7389) 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.
The 10-meter sensors (MB7363, MB7366, MB7383, and MB7386) use a scale factor of (Vcc/10240) per 1-mm. The distance is output
with a 10-mm resolution. The analog voltage output is typically within ±10-mm of the serial output.
Using a 10-bit analog to digital converter with the 5-meter 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).
Using a 10-bit analog to digital converter with the 10-meter 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 10 to yield the range in mm. For example, 30 counts corresponds to 300-mm
(where 30 x 10 = 300), and 1000 counts corresponds to 10,000-mm (where 1000 x 10 = 10,000-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-WR 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 8 and 9.
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 8 and 9.
Pin 5-Serial Output:
The MB736X sensors have an RS232 data format (with 0V to Vcc levels) and the MB738X 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 (5-meter models) or 9998 mm (10-meter
models). A range value of 5000 or 9999 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 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 10 & 11 for minimum operating voltage
verses temperature information.
GND Pin 7 –
Sensor ground pin: DC return, and circuit common ground.
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 2
Web:
www.maxbotix.com
PD11500s
HRXL-MaxSonar
®
- WR/WRC
™
Series
About Ultrasonic Sensors
The HRXL-MaxSonar-WR ultrasonic sensors are in-air, non-contact object detection and ranging sensors that detect
objects within an area. These sensors are not affected by the 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 outputs a range reading.
_______________________________________________________________________________________________________________________________________
Device Comparison
First
Most
High
Optimized Alternative
Serial Detectable Likely Performance for snow Packages
Part
Number Interface
target
Filter
HR Filter
1
depth
available
MB7360
MB7363
MB7366
MB7369
MB7380
MB7383
MB7386
MB7389
RS232
RS232
RS232
RS232
TTL
TTL
TTL
TTL
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Soft/Small
Target
Detection
2
5 Meter
Range
Yes
10 Meter
Range
Yes
Yes
Notes
exceeds the ability of the first generation XL-MaxSonar-WR models MB70##. Also includes target size compensation, internal temperature sensor, external temperature
sensor, factory calibration, supply voltage droop compensation, continuous automatic calibration, and side lobe suppression.
2
1
Higher gain and other calibration allows better performance to soft targets.
_______________________________________________________________________________________________________________________________________
Auto Calibration
Each time a HRXL-MaxSonar-WR 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-WR 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%
1
, regardless of target size
1
.
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.
Supply Voltage Compensation
During power up, the HRXL-MaxSonar-WR sensor line 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.
Notes:
1
Refer to section that compares WR to WRC on page 4
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 3
Web:
www.maxbotix.com
PD11500s
HRXL-MaxSonar
®
- WR/WRC
™
Series
Base sensor (MB7360 and MB7380)
The MB7360 and MB7380 are the base model of the HRXL-MaxSonar-WR sensor line. These sensors are recommended
for users unsure of which sensor to use in their application. All other sensors in this series are based off of these sensor
models. The additional features are mentioned in their respective sections below.
_______________________________________________________________________________________________________________________________________
HRXL-MaxSonar-WRLS (MB7363 and MB7383)
The HRXL-MaxSonar-WRLS sensors are 10 meter sensors with a higher sensitivity than other HRXL-MaxSonar-WR
products. This sensor is recommended for applications in which objects do not reflect enough ultrasonic sound, such as
people, to be detected. Users are encouraged to test the sensor in their application to verify usability.
_______________________________________________________________________________________________________________________________________
HRXL-MaxSonar-WRL (MB7366, MB7386)
The HRXL-MaxSonar-WRL sensors are the 10-meter version of the HRXL-MaxSonar-WR sensors.
_______________________________________________________________________________________________________________________________________
HRXL-MaxSonar-WRM (MB7369 and MB7389)
The HRXL-MaxSonar-WRM sensors are equipped with filtering firmware which allows the sensor to ignore smaller
targets and noise, and still report the target that gives the largest acoustic return. (The sensor will also reject periodic
noise, even noise that has a higher amplitude than the acoustic return from the target.) This gives users the flexibility to
consistently range larger targets in the presence of clutter and noise. If the largest target is removed from the field of view,
the HRXL-MaxSonar-WRM will switch to the target that gives the next largest detectable return.
The HRXL-MaxSonar-WRM sensors were designed for applications where users were concerned with ranging the
distance to large flat targets (such as in a water tank). This stands in contrast to other HRXL-MaxSonar-WR sensors
which will report the distance to the first detectable target.
In general, the HRXL-MaxSonar-WRM will select the largest target from its field of view and report its range. Even so,
objects up close may provide significantly greater returns over distant objects. Users are encouraged to test the sensor in
their application to verify usability.
When targets are of similar amplitude reflections, preference is given to the closest target.
_______________________________________________________________________________________________________________________________________
About Package Types
The HRXL-MaxSonar-WR sensors are available in a variety of packages for applications with specific mounting
requirements. The full horn package provides peak accuracy and sensitivity in this sensor line. It is recommended that
testing is completed to ensure that the selected sensor will operate as desired in your application.
Package Types Currently Available
Full Horn –
3/4” NPT straight; back mounted thread
(best performance)
Compact –
3/4” NPT straight; back mounted thread
1”NPS – External thread over full sensor body (1”NPS)
1”BSPP – External thread over full sensor body (1”BSPP)
30mm1.5 – External thread over full sensor body (30mm1.5)
All package types have exposed PCB on user end for easy connection. Users
desiring a fully enclosed assembly may purchase the “Shielded Cable Attach
Option” along with their sensor.
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 4
Web:
www.maxbotix.com
PD11500s
HRXL-MaxSonar
®
- WR/WRC
™
Series
Performance Changes when Selecting a Non-Full Horn Package
When selecting a HRXL-MaxSonar-WR sensor without the full horn the sensor will experience the following
performance changes:
•
•
•
•
•
The sensor will have a wider beam shape for the first meter.
The sensor may be less accurate by an additional +/- 0.5%.
The sensor may have a dead zone from 0mm
–
500mm.
The sensor may have worse performance to small or soft targets.
The sensor may experience decreased noise immunity when ranging to small, soft, angled, or distant targets.
_______________________________________________________________________________________________________________________________________
Mechanical Dimensions
Full Horn
C
D
E
Pin 1
Pin 2
F
Pin 3
Pin 4
Pin 5
V+
GND
B
A
G
A
1.72” dia. 43.8 mm dia.
2.00”
50.7 mm
B
0.58”
14.4 mm
C
0.31”
7.9 mm
D
0.23”
5.8 mm
E
0.1”
2.54 mm
F
3/4”-14 NPS
G
H
1.032” dia. 26.2 mm dia.
1.37”
34.8 mm
I
Weight, 1.76 oz., 50 grams
Outside
Thread H
Diameter
Housing
I Nut
Width
Values Are Nominal
Compact Housing
C
D
E
Pin 1
Pin 2
F
Pin 3
Pin 4
Pin 5
V+
GND
B
A
G
A
1.37” dia. 34.7 mm dia.
0.70”
17.9 mm
B
0.57”
14.4 mm
C
0.31”
7.9 mm
D
0.23”
5.8 mm
E
0.1”
2.54 mm
F
3/4”-14 NPS
G
H
1.032” dia. 26.2 mm dia.
1.37”
34.8 mm
I
Weight, 1.23 oz., 32 grams
Outside
Thread H
Diameter
Housing
I Nut
Width
Values Are Nominal
1” NPS Pipe Threading
A
C
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
V+
GND
D
B
E
F
1.52”
38.5 mm
A
B
1.29” dia. 33.0 mm dia.
0.22”
5.5 mm
C
1.30”
33.1 mm
D
0.10”
2.54 mm
E
1” - NPS
F
0.78”
19.81 mm
G
Weight, 1.23 oz., 35 grams
G
Values Are Nominal
MaxBotix
®
Inc.
Copyright 2005 - 2012 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 5
Web:
www.maxbotix.com
PD11500s
