4-20HR-MaxSonar
®
-WR
™
Series
4-20HR-MaxSonar -WR/WRC™ Series
High Resolution, Precision, IP67 Weather Resistant, Ultrasonic Range
Finders
MB7460, MB7469, MB7480, MB7489
5
®
The 4-20HR-MaxSonar-WR sensor line is a high performance ultrasonic precision
rangefinder that provides high accuracy, high resolution ultrasonic range detection in air.
The 4-20HR-MaxSonar-WR sensor line is a cost-effective solution for automation/process
control applications where precision range-finding, low-voltage operation, space saving,
low cost and IP67 weather resistance is needed. This sensor component allows users of
other more costly precision rangefinders to lower the cost of their systems without
sacrificing performance. The sensor output works with existing PLC equipment and is also
suitable for applications with long cable runs. The 4-20HR-MaxSonar-WR/WRC sensor line features 1.6-mm resolution,
superior rejection of outside noise sources, internal speed-of-sound temperature compensation and optional external
speed-of-sound temperature compensation. The sensors are factory calibrated to provide stable and reliable range
readings. With a maximum range of 5 meters, these ultrasonic sensors detect objects from 5-mm and ranges to objects
from 50-cm to maximum range. Objects closer than 50-cm are typically reported as 50-cm (See Close Range Operation).
•
Operating temperature range
Easy to Use Component
Precision Ultrasonic Range
from -40°C to +65°C
•
Robust and easy to use interface
Sensing
•
Operating voltage from 10V to 32V
•
Excellent noise rejection
•
A fraction of the cost of other
•
IP67 rated
•
Small and easy to mount
precision rangefinders
Applications & Uses
•
Factory-matched accuracy provides a
•
Stable, reliable range readings
•
Target size compensation provides
•
Automated process control systems
typical accuracy of 1% or better of
1
greater consistency and accuracy
distance to target
•
Tank level measurement
•
Auto handles acoustic noise
1,3
•
Reading-to-reading stability of
•
Weather station monitoring
1
•
Calibrated sensor eliminates most
1.6-mm at 1-meter is typical
•
Bin level measurement
sensor-to-sensor variations
•
Compensation for target size
•
Corn level measurement
1
variation and operating voltage range
•
Handles multiple sensor
•
Proximity zone detection
environments
•
Temperature compensation is
•
People detection
standard
•
Robot ranging
General Characteristics
•
Additional chemical resistance
•
Long range object detection
•
4-20mA with ~1.6mm resolution
available
2
•
Environments with acoustic and
•
Refresh rate of ~8Hz
electric noise
Low Power Requirements
•
Determines range to largest object
•
Height monitors
•
Average power draw of 20-40mA
(MB7469, MB7489)
•
Auto sizing
•
Determines range to first detectable
•
Other interfaces (non4-20mA)
object (MB7460, MB7467, MB7480,
•
Box dimensions
available with lower current draw
MB7487)
•
Flexible, low supply voltage
Notes
1
Users to evaluate the sensor performance
•
Excellent clutter rejection
requirements simplifies battery
2
F-Option provides added protection from hazardous
powered designs
•
Low-cost ultrasonic rangefinder
chemical environments
3
By design
•
Low current draw reduces current
•
Resolution of ~1.6-mm
4
Part-specific timing information — see page 3
drain for battery operation
5
•
Distance from 50-cm to 5-meters
Please reference page 12 for part number key
•
Excellent MTBF of > 200,000 hrs.
•
Superior noise rejection
4
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
PD12585k
4-20HR-MaxSonar
®
-WR
™
Series
General Operation
The 4-20HR-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 on the
time of flight, the sensor outputs a distance value.
4-20 Sensor Connection Pin Out
Pin 6 —
Ground return for the DC power supply.
The black wire will be for the cable attach.
Pin 5 —
4-20mA signal output, the analog current output has a resolution of ~1.6mm.
The brown wire will be for the cable attach.
Pin 4 —
Vcc input. This sensor has an operational input voltage of 10V to 32V DC. This
sensor has a nominal current draw of less than 40mA.
The red wire will be for the cable attach.
Pin 1
Temperature Sensor Connections
Pin 3
— Temperature sensor V+ source. This is the red connection wire on the HR-MaxTemp sensors.
Pin 2
— Temperature sensor input. This is the white connection wire on the HR-MaxTemp sensors.
Pin 1
— Temperature sensor shield.
_______________________________________________________________________________________________________________________________________
Output Conversion Equations
Formulas to convert the sensor output are to distance provided below for convenience.
Using I (mA) as the output current and d (mm) as the distance.
Distance
MB746X
MB748X
d = (((I - 4) * 4500) / 16) + 500
d = 5000 - (((I - 4) * 4500) / 16)
Current
I = (((d - 500) * 16) / 4500) + 4
I = (((5000 - d) * 16) / 4500) + 4
_______________________________________________________________________________________________________________________________________
Scaling the 4-20mA to a 5V or 10V Analog Voltage
The 4-20HR-MaxSonar-WR sensor output can be easily scaled at the user end to
match the voltage range of an existing PLC or microcontroller system equipped with
an analog to digital converter by using the schematic shown to the right.
For 5V data use a resistor value of 250 ohms 0.1% — when using this resistor value
the sensor
requires a minimum of 15VDC
for proper operation and runs with a
voltage range of 1V to 5V.
For 10V data use a resistor value of 500 ohms 0.1% — when using this resistor value
the sensor
requires a minimum of 19VDC
for proper operation and runs with a
voltage range of 2V to 10V.
Custom products with analog voltage outputs are also available from MaxBotix Inc.
Formulas to convert the sensor output to distance are provided below for convenience.
Using V (volts) as the output voltage and d (mm) as the distance.
Distance
5V
5V
MB746X
MB748X
d = (((V - 1) * 4500) / 4) + 500
d = 5000 - (((V - 1) * 4500) / 4)
d = (((V - 2) * 4500) / 8) + 500
d = 5000 - (((V - 2) * 4500) / 8)
Voltage
V = (((d - 500) * 4) / 4500) + 1
V = (((5000 - d) * 4) / 4500) + 1
V = (((d - 500) * 8) / 4500) + 2
V = (((5000 - d) * 8) / 4500) + 2
Page 2
Web:
www.maxbotix.com
PD12585k
10V MB746X
10V MB748X
MaxBotix
®
Inc.
Copyright 2005 - 2014 MaxBotix Incorporated
Patent 7,679,996
MaxBotix Inc., products are engineered and assembled in the USA.
4-20HR-MaxSonar
®
-WR
™
Series
4-20HR-MaxSonar-WR (MB7460 and MB7480)
The MB7460 and MB7480 are the base models of the 4-20-MaxSonar-WR sensor line. These general purpose sensors are
recommended unless specific requirements indicate other sensors may be a better fit for the application. All other sensors
in this series are based off of this sensor model. The additional features are mentioned in their respective sections below.
_______________________________________________________________________________________________________________________________________
4-20HR-MaxSonar-WRM (MB7469 and MB7489)
The 4-20HR-MaxSonar-WRM sensors come with the most-likely filter features. The MB7469 output matches the output
of the MB7460. The MB7489 output matches the output of the MB7480.
In general, the 4-20HR-MaxSonar-WRM sensors 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.
_______________________________________________________________________________________________________________________________________
About Package Types
The 4-20HR-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.
_______________________________________________________________________________________________________________________________________
Performance Changes when Selecting a Non-Full Horn Package
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.
When selecting a 4-20HR-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.
_______________________________________________________________________________________________________________________________________
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.
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
PD12585k
4-20HR-MaxSonar
®
-WR
™
Series
Mechanical Dimensions
3/4” National Pipe Thread Straight Full Horn
A
B
C
D
E
F
G
H
I
J
K
L
M
2.87”
72.9 mm
1.72” dia. 43.8 mm dia.
0.31”
7.9 mm
0.58”
14.4 mm
2.00”
50.7 mm
0.31”
7.9 mm
0.10”
2.54 mm
3/4” NPS
1.37” dia. 34.8 mm dia.
1.03” dia. 26.2 mm dia.
0.41”
10.3 mm
0.78”
19.81 mm dia.
0.62”
15.76 mm
weight, 1.89 oz., 53.5 grams
A
C
D
F
Pin 1
B
G
H
E
I
J
K
Pin 1
L M
values are nominal
1” National Pipe Thread Straight
A
C
Pin 1
B
E
D
A
B
C
D
E
F
G
H
I
F
1.58”
40.2 mm
1.29” dia.
33.0 mm dia.
0.27”
7.0 mm
1.30”
33.1 mm
0.10”
2.54 mm
1” NPS
0.40”
10.3 mm
0.78”
19.81 mm
0.62”
15.76 mm
weight, 1.28 oz., 36.3 grams
G
Pin 1
H I
values are nominal
1” BSPP Pipe Thread
A
C
Pin 1
B
E
D
A
B
C
D
E
F
G
H
I
F
1.58”
40.2 mm
1.29” dia.
33.0 mm dia.
0.27”
7.0 mm
1.30”
33.1 mm
0.10”
2.54 mm
1” BSPP
0.40”
10.3 mm
0.78”
19.81 mm
0.62”
15.76 mm
weight, 1.26 oz., 35.6 grams
G
Pin 1
H I
values are nominal
30mm 1.5 Pipe Thread
A
C
Pin 1
B
E
D
A
B
C
D
E
F
G
H
I
F
1.58”
40.2 mm
1.17” dia.
29.7 mm dia.
0.27”
7.0 mm
1.24”
31.5 mm
0.10”
2.54 mm
30mm 1.5
0.40”
10.3 mm
0.78”
19.81 mm
0.62”
15.76 mm
weight, 1.14 oz., 32.4 grams
G
Pin 1
H I
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 4
Web:
www.maxbotix.com
PD12585k
4-20HR-MaxSonar
®
-WR
™
Series
Auto Calibration
The 4-20HR-MaxSonar-WR series sensor auto calibrates each time it takes a range reading. 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.
_______________________________________________________________________________________________________________________________________
Sensors Minimum Distance
The MB7460 and MB7480 are the base models of the 4-20HR-MaxSonar-WR sensor line. Sensors based on the MB7460
have a relative zero set at 4mA (4mA = 500 mm; 20mA = 5000 mm) and the sensors based on the MB7480 have a relative
zero of 20mA (20mA
= 500 mm; 4mA = 5000 mm).
_______________________________________________________________________________________________________________________________________
Range Zero Location
In general, the 4-20HR-MaxSonar-WR sensors report the range to the leading edge of the closest detectable object. Target
detection is characterized in the sensor beam patterns.
The 4-20HR-MaxSonar-WR reports the range to distant targets from where the threading and nut meet on the sensor
housing as shown in the diagrams below.
Range Zero
0.0 mm
The range is measured from where the housing meets the threading.
Target Face
Range Zero
0.0 mm
The range is measured from the front of the sensor.
Target Face
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
PD12585k
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