MB7780-220 datasheet, PDF - EEWORLD Datasheet

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MB7780-220: DescriptionULTRASONIC SENSOR 420SC-MAXSONAR; CategoryThe sensor; File Size733KB，14 Pages; ManufacturerMaxBotix Inc.

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MB7780-220 Overview

ULTRASONIC SENSOR 420SC-MAXSONAR

MB7780-220 Parametric

Parameter Name	Attribute value
frequency	42kHz
Voltage - Rated	10 V ~ 32 V
Beam aperture angle	23°
Operating temperature	-40°C ~ 65°C（TA）

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4-20SC-MaxSonar

-WR

™

Series

4-20SC-MaxSonar -WR/WRC™ Series

High Resolution, Precision, IP67 Weather Resistant, Ultrasonic Range

Finders

MB7760, MB7769, MB7780, MB7789

The 4-20SC-MaxSonar-WR sensor line is a high performance ultrasonic precision

rangefinder that provides high accuracy, high resolution ultrasonic range detection in air.

The 4-20SC-MaxSonar-WR sensor line includes an effective self-cleaning capability

designed to reduce the impact of condensation in closed or high-moisture (dew, frost, etc.)

environments and 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 4-20SC-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).

Precision Ultrasonic Range

Sensing

Easy to Use Component

•

Robust and easy to use interface

•

Excellent noise rejection

•

A fraction of the cost of other

•

Small and easy to mount

precision rangefinders

•

Factory-matched accuracy provides a

•

Stable, reliable range readings

•

Target size compensation provides

typical accuracy of 1% or better of

greater consistency and accuracy

distance to target

•

Auto handles acoustic noise

1,3

•

Reading-to-reading stability of

•

Calibrated sensor eliminates most

1.6-mm at 1-meter is typical

sensor-to-sensor variations

•

Compensation for target size

variation and operating voltage range

General Characteristics

•

Temperature compensation is

•

4-20mA with ~1.6mm resolution

standard

•

Refresh rate of ~0.60Hz

•

Additional chemical resistance

•

Determines range to largest object

available

(MB7769, MB7789)

Low Power Requirements

•

Determines range to first detectable

•

Average power draw of ~70mA

object (MB7760, MB7767, MB7780,

MB7787)

•

Other interfaces (non4-20mA)

available with lower current draw

•

Excellent clutter rejection

•

Flexible, low supply voltage

•

Low-cost ultrasonic rangefinder

requirements simplifies battery

•

Resolution of ~1.6-mm

powered designs

•

Distance from 50-cm to 5-meters

•

Low current draw reduces current

•

Excellent MTBF of > 200,000 hrs.

drain for battery operation

•

Superior noise rejection

•

Operating temperature range

from -40°C to +65°C

•

Operating voltage from 10V to 32V

•

IP67 rated

Applications & Uses

•

Automated process control systems

Tank level measurement

Weather station monitoring

Bin level measurement

Corn level measurement

Proximity zone detection

People detection

Robot ranging

Long range object detection

Environments with acoustic and

electric noise

•

Height monitors

•

Auto sizing

•

Box dimensions

Notes

Users to evaluate the sensor performance

F-Option provides added protection from hazardous

chemical environments

By design

Please reference page 12 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.

MaxBotix

Inc.

Patent 7,679,996

MaxBotix Inc., products are engineered and assembled in the USA.

Page 1

Web:

www.maxbotix.com

PD13441d

4-20SC-MaxSonar

-WR

™

Series

About Ultrasonic Sensors

The 4-20SC-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.

_______________________________________________________________________________________________________________________________________

Base Sensor (MB7760 & MB7780)

The MB7760 and MB7780 sensors are the base models of the 4-20SC-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 these sensor models. The additional features are mentioned in their respective

sections below.

_______________________________________________________________________________________________________________________________________

4-20SC-MaxSonar-WRM (MB7769 & MB7789)

The 4-20SC-MaxSonar-WRM sensors comes with the self-cleaning and most-likely filter features.

In general, the 4-20SC-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.

4-20SC-MaxSonar-WRM sensors should not be used in multiple sensor operation.

MaxBotix recommends choosing the 4-20SC-MaxSonar-WRM sensors for applications that are in high-moisture

environments, or which are vulnerable to occasional condensation. These sensors are IP67 rated, so water or ice will not

damage the sensor.

_______________________________________________________________________________________________________________________________________

Self-Cleaning Description

The 4-20SC-MaxSonar-WR sensors feature a self-cleaning protocol which gently heats the face of the transducer, and

atomizes any moisture or 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 affects 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 transducer face will impede

sensor operation. These targets will either be detected or cause a reduction in the sensitivity of the sensor. The self-

cleaning operation is designed to prevent 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 with the self-cleaning 4-20SC-MaxSonar-WR sensors.

MaxBotix

Inc.

Patent 7,679,996

MaxBotix Inc., products are engineered and assembled in the USA.

Page 3

Web:

www.maxbotix.com

PD13441d

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