SCXL-MaxSonar
®
- WR/WRC
™
Series
SCXL-MaxSonar - WR/WRC Series
Self-Cleaning, High Resolution, IP67 Weather Resistant, Ultrasonic Sensor
MB7560, MB7563, MB7566, MB7567, MB7569, MB7580, MB7583, MB7586, MB7587, MB7589
10
®
™
The SCXL-MaxSonar-WR/WRC sensor line includes an effective self-cleaning capability
designed to reduce the impact of condensation in closed or high-moisture (dew, frost, etc.)
environments. This sensor is a cost-effective solution for applications where precision range-finding, low-voltage
operation, space saving, low-cost, self-cleaning, and IP67 weather resistance rating is needed. This sensor component
module allows users of other, more costly precision rangefinders to lower the cost of their systems without sacrificing
performance.
The SCXL-MaxSonar-WR/WRC self-cleaning 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 SCXL-MaxSonar-WR/WRC self-cleaning models are available in 5-meter or 10-meter models. This
ultrasonic sensor 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 (MB7560
series) or TTL (MB7580 series). Factory calibration is standard.
*For select sensors this distance is 50-cm, refer to page 5.
Precision Ultrasonic Range
Sensing
•
Self-cleaning algorithm
•
Reading-to-reading stability of
1-mm at 1-meter is typical
1
•
Factory matched accuracy, typical
accuracy of 1% or better
1,2
•
Target size and operating voltage
compensation
•
Internal temperature compensation
•
Optional external temperature
compensation
•
Determines range to largest object
(MB7569 , MB7589)
•
Determines range to first detectable
object
(MB7560, MB7563, MB7566, MB7567,
MB7580, MB7583, MB7586, MB7587)
•
Excellent clutter rejection
•
Added chemical resistance available
7
Easy to use Component Module
•
Easy to use interface with distance
provided in a variety of outputs
•
Sensor automatically handles
acoustic noise
2,4
•
Small and easy to mount
•
Calibrated sensor eliminates most
sensor to sensor variations
Range Outputs
•
Pulse width, 1uS/mm resolution
•
Analog Voltage, 5-mm or 10mm
resolution
8
•
Serial, 1-mm resolution (RS232 or
TTL)
General Characteristics
•
Low cost ultrasonic rangefinder
•
5-meters or 10-meter detection range
•
Resolution of 1-mm
•
Distance sensor from 30-cm to
5-meters or 50-cm to 10-meters
based on model
•
Excellent
2
MTBF
•
Free run operation with superior
noise rejection
3
•
Operating temperature range
from -40°C to +65°C
9
•
•
•
•
Operating voltage from 2.7V to 5.5V
Current draw of ~68mA at 5V
IP67 Rated
Sensor should remain on and be
allowed to free run for self-clean
feature to operate.
Applications & Uses
•
Tank level measurement
5
•
Bin level measurement
•
Long range object detection
•
Height monitors
•
Auto sizing
•
Automated factory systems
Notes:
1
Refer to section that compares WR to WRC on page 5
Users are encouraged to evaluate the sensor performance in
their application
3
Reference pages 10-11 for part specific timing information
4
by design
5
MB7569 or MB7589 is the recommended sensor
6
See page 9 for multi-sensor operation
7
F-Option provides additional protection from hazardous
chemical environments
8
refer to Pin 3 description on page 2
9
Please reference page 12 & 13 for minimum operating
voltage verses temperature information
10
Please reference page 19 for part number key.
2
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 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 1
Web:
www.maxbotix.com
PD12672i
SCXL-MaxSonar
®
- WR/WRC
™
Series
SCXL-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 9 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 (MB7560, MB7567, MB7569, MB7580, MB7587, and MB7589) 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 (MB7563, MB7566, MB7583, and MB7586) 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– RX:
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.
Pin 5-Serial Output:
The MB756X sensors have a serial RS232 data format (with 0V to Vcc levels) and the MB758X
sensors have 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. The SCXL-MaxSonar-WR self-
cleaning sensors have a current draw of ~34mA at 3.3V and ~68mA at 5V. 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 12 & 13 for
minimum operating voltage verses temperature information.
GND Pin 7 –
Sensor ground pin: DC return, and circuit common ground.
MaxBotix
®
Inc.
Copyright 2005 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 2
Web:
www.maxbotix.com
PD12672i
SCXL-MaxSonar
®
- WR/WRC
™
Series
Self-Cleaning Description
The SCXL-MaxSonar-WR sensors feature a self-cleaning protocol which gently heats the face of the transducer, and
atomizes any moisture/condensation on the sensor’s transducer face. This feature allows the sensor to be used in a wide
variety of applications that may experience condensation issues. Self-cleaning is needed for many such applications due
to detection performance limitations resulting from condensation, including only reporting the minimum or maximum
reported distance.
Condensation is frequently an issue in tanks because the sensor is typically mounted at the top of the tank, above a
warmer liquid. On clear nights or cold nights, this causes the sensor hardware to be colder than its surrounding
environment, causing condensation to build up on the surface of the exposed sensor hardware. This can also occur in
some buildings, depending on climate control.
The reason that condensation is problematic to sensors is fairly straightforward. Sensors determine distance to targets,
even if that target is on the surface of the transducer. Targets (condensation, solid particles, etc.) on the surface of the
transducer impede sensor operation. These targets (on the surface of the transducer) will either be detected or cause a
reduction in the sensitivity of the sensor. The self-cleaning operation is designed to prevent buildup and remove buildup
of moisture from the surface of the transducer. For proper self-cleaning, the sensor must remain on, and continue normal
ranging operation.
The self-cleaning feature is only designed for moisture, not removal of dust or other solid particles. Multiple sensor
operation is not possible without running in triggered mode.
Single-sensor operation
The self-cleaning protocol runs with the RX pin is set to ‘High’. It does not run with the RX pin is set to ‘Low’. We
recommend running this protocol when condensation is expected. This will occur at different times depending on your
specific application environment. Sensor wiring for single sensor operation is shown on page 9 of this datasheet.
Multiple-sensor operation
Running more than one sensor in a given environment is only possible by running in triggered operation mode.
Below are several different strategies for setting up multiple sensors in triggered mode (arranged in order for use in
lower-moisture to higher-moisture environments).
1.) (Note: this low-power strategy maximizes sensor availability while allowing self-cleaning cycle to run – for
lower-moisture environments, or where maximum data is needed):
a. Run each sensor for seven (7) seconds in sequence. Take a range reading from each sensor sequentially.
2.) (Note: This strategy is designed for high-moisture environments, saves battery when condensation is not expected. For
example, during the portion of the night when the temperature is dropping):
a. Run all sensors continually when condensation is expected.
b. Only run a sensor when range information is needed. At this time, shut down (by holding the RX pin LOW) all
the other sensors and cycle the desired sensor for seven (7) seconds.
c. Timing of sensor cycles should be based on other data (i.e. time of day/year, temperature, etc.)
3.) (Note: This strategy maximizes self-cleaning cycles over time - for high-moisture environments):
a. Run all sensors continually while ignoring range output (keeps sensors condensation-free but no range readings
during this time – maximizes self-cleaning cycles over time)
b. When a reading is desired, shut down the sensors, trigger each individual sensor one at a time for seven (7)
seconds and take a range reading for each sensor
c. Go back to step 1 (keep all sensors running).
MaxBotix recommends choosing an SCXL-MaxSonar-WR product for applications that are in high-moisture
environments, or which are vulnerable to occasional condensation. These sensors are IP67 rated.
MaxBotix
®
Inc.
Copyright 2005 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 3
Web:
www.maxbotix.com
PD12672i
SCXL-MaxSonar
®
- WR/WRC
™
Series
Base sensor (MB7560 and MB7580)
The MB7560 and MB7580 are the base model of the SCXL-MaxSonar-WR self-cleaning 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.
_______________________________________________________________________________________________________________________________________
SCXL-MaxSonar-WRLS (MB7563 and MB7583)
The SCXL-MaxSonar-WRLS self-cleaning sensors are 10-meter sensors with high sensitivity. These sensors are
recommended for applications in which objects that do not reflect enough ultrasonic sound, such as people, need to be
detected. Users are encouraged to test the sensor in their application to verify usability.
_______________________________________________________________________________________________________________________________________
SCXL-MaxSonar-WRL (MB7566, MB7586)
The SCXL-MaxSonar-WRL self-cleaning sensors are the 10-meter version of the SCXL-MaxSonar-WR sensors.
_______________________________________________________________________________________________________________________________________
SCXL-MaxSonar-WRM (MB7569 and MB7589)
The SCXL-MaxSonar-WRM self-cleaning 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 SCXL-MaxSonar-WRM will switch to the target that gives the next largest detectable return.
The SCXL-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 SCXL-MaxSonar-WR sensors
which will report the distance to the first detectable target.
In general, the SCXL-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 SCXL-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 Option”
along with their sensor.
MaxBotix
®
Inc.
Copyright 2005 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 4
Web:
www.maxbotix.com
PD12672i
SCXL-MaxSonar
®
- WR/WRC
™
Series
Performance Changes when Selecting a Non-Full Horn Package
When selecting a SCXL-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
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”
0.10”
E
1” - NPS
F
0.78”
19.81 mm
G
Weight, 1.23 oz., 35 grams
G
F
Values Are Nominal
MaxBotix
®
Inc.
Copyright 2005 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
Page 5
Web:
www.maxbotix.com
PD12672i
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