Improving safety in harsh environments

3D safety systems: the key factors when scrutinising danger zones

3D safety systems are regarded as a good option for reliably monitoring danger zones. They present a safe alternative, even in harsh environments where sparks, dirt and dust occur, for example. They are therefore also a solution for applications where previously optical sensors were unable to provide a reliable answer.

“For over 50 years, Leuze, as a high-tech company and pioneer in the field of optical sensors, has repeatedly set new technological milestones and standards on the market,” states the company. “Particularly in the area of safety technology, Leuze's optical safety components, services and solutions can be used for a wide variety of different applications.”

With the LBK safety radar system, Leuze has now added a new sensor system to its product range. “This system implements an operating principle new to safety technology. As a result, it is also able to provide a solution for applications that previously could not be solved reliably using optical sensors. The LBK safeguards danger zones close to machinery and systems using radar technology.”

Detection of objects using radar waves

The LBK system operates in a frequency range of 24 GHz. This means that the electromagnetic waves are much shorter than sound or light waves. Unlike light, the radar waves can penetrate non-metallic objects. The compact sensors with their integrated antennas emit electromagnetic waves. These waves are reflected off objects. The sensors receive these reflections and then evaluate them. The electromagnetic waves of the LBK radar system are completely harmless to personnel.

New applications solved using LBK

Utilising the properties of the radar frequency electromagnetic waves in sensors provides a solution for applications where optical sensors have so far proven unreliable. Even non-metallic objects, such as dust, welding sparks or chips, are penetrated without the sensor being influenced.

As a result, the LBK system is particularly suitable for applications in harsh environments. For example, in wood or plastic processing. Such applications typically produce a large quantity of particles that are then suspended in the air. However, these particles do not prevent the LBK from performing its task of reliably detecting and protecting persons.

Even if radar waves penetrate the particles, the latter still reflect a small proportion of the waves. As the quantity of radar waves reflected by a person is significantly different to that reflected by wood chips or moisture, the LBK can detect whether the reflection comes from a person or from non-metallic particles. In other words, particles in the air are not detected, whereas a person is.

The LBK therefore switches off reliably when a person is located in the danger zone. The LBK sensor emits its radar waves in three dimensional space, so that not only the surface area, but also the volume of this space, is monitored. This allows the LBK to detect persons who enter a hazardous area or who are located in this area, regardless of whether they are standing, kneeling or lying. LBK reliably differentiates between static and dynamic objects.

Detecting human movements

The LBK 3D radar system not only operates in a wavelength range new to safety technology. It also uses FMCW, an operating principle, which is also new to safety technology. FMCW stands for Frequency Modulated Continuous Wave. Here, the transmission frequency changes within a defined bandwidth. Starting at a fundamental frequency, it increases continuously up to a maximum frequency and then returns to the fundamental frequency again. If a person reflects this signal, it reaches the receiver with a time delay.

Subtraction of the reception signal from the transmission signal produces a difference frequency. If the distance between the LBK sensor and the person remains constant, the difference frequency also retains its value. However, if the person moves, the time delay between the transmitted and received signal changes, and therefore also the difference frequency. The faster the person moves, the greater the change in difference frequency will be. In this way, the LBK sensor is able to determine the speed at which the person is moving.

Precise determination

This method is also referred to as 'radar Doppler'. It allows movements to be determined with a very high degree of accuracy. The LBK sensor therefore detects not only a moving person, but also a person who is currently standing still, even if the movement is extremely slight. Even if a person is standing still, they are never absolutely motionless – there is always some movement, such as from their pulse or heartbeat etc.

The LBK sensor utilises this to reliably distinguish a person in a danger zone from a static object – eg, a pallet or material container. The slight movements of a person are sufficient to generate a reliable switch-off signal for the machine. As a result, the LBK system interrupts the operating process only if somebody is actually located inside the danger zone. For example, completely static, motionless material containers can be left inside the protected area without them leading to interruption of the operating process.

In this way, the LBK system prevents unnecessary downtimes, and thereby increases the availability and cost effectiveness of the system. On the other hand, it ensures that the machine only starts to run again when all persons have left the danger zone and therefore contributes to reliable personnel protection.

Flexible in use

In addition to use in harsh environments, the LBK safety radar system is used primarily for preventing unwanted restarts and for monitoring hidden areas. Users can adapt it to their individual requirements. The system consists of a controller to which up to six radar sensors can be connected. The positioning of the sensors, the adjustable operating range and the selectable opening angle allow flexible adaptation of the monitored area to the danger zone.

This also enables areas on steps or pedestals to be monitored reliably. The user can define the system parameters using the easy to operate configuration software. Certified safety experts from Leuze are available to assist with configuration and commissioning, if required, adds the company.

With the LBK safety radar system, Leuze has now added a new sensor system to its product range.
With the LBK safety radar system, Leuze has now added a new sensor system to its product range.
The LBK switches off reliably when a person is located in the danger zone.
The LBK switches off reliably when a person is located in the danger zone.

Leuze

Terek House, Sandpiper Court
Phoenix Park
St Neots
PE19 8EP
UNITED KINGDOM

+44 (0)1480 408500

mail@leuze.co.uk

www.leuze.co.uk

More from Leuze

AI has its eye on bar code identification

Posted 5 days ago

Quick-action integration via IO-Link

Posted 1 month ago

White Paper: Optical sensors and light curtains

Posted 1 month ago

Sensor expert Leuze enjoys strong growth

Posted 1 month ago

Reliable detection of shrink-wrapped packages

Posted 3 months ago

New distribution centre for Leuze

Posted 4 months ago

Time and money savings pledge for conveyor system manufacturers

Posted 6 months ago

Greater safety in harsh environments

Posted 8 months ago

Container and tray identification made easy

Posted 8 months ago

White Paper: Industry 4.0 and the dual channel principle

Posted 8 months ago

Bar code reader range enhanced

Posted 9 months ago

Industry 4.0 technology report – the dual channel principle

Posted 9 months ago

Leuze sensors take the biscuit

Posted 11 months ago

Dynamic safeguarding of AGV/robot transfer stations

Posted 1 year ago

Advances in reference diffuse sensor technology

Posted 1 year ago

Sweet success for sensors in confectionery manufacture

Posted 1 year ago

2D-code readers key to success of tyre automation system

Posted 1 year ago

Work progresses on Leuze's new distribution centre

Posted 1 year ago

Leuze electronic launches volume measurement system

Posted 1 year ago

Vision-based sensor for precise control of double-depth position

Posted 1 year ago

Leuze code reader gains Blockchain authentication capability

Posted 1 year ago

Leuze electronic wins Best-of-Industry-Award at SPS show

Posted 1 year ago

Is it still acceptable to use two-beam safety light barriers?

Posted 2 years ago

What are the options for AGV navigation sensors?

Posted 2 years ago

Safety light curtain incorporates SPG muting technology

Posted 2 years ago

Process-controlled access guarding without using muting sensors

Posted 2 years ago

How machine tools and systems can operate safely and efficiently

Posted 2 years ago

Leuze electronic safety expertise at LogiMAT 2019

Posted 2 years ago

What is dual channel technology for sensors?

Posted 2 years ago

Latest developments in AGV positioning technologies

Posted 3 years ago

Customised sensor developed for lab automation robot

Posted 3 years ago

Latest laser area scanners for static and AGV applications

Posted 3 years ago

Compact cylindrical optical sensor housed in M12 body

Posted 3 years ago

Leuze sensors used in automated powder coating system

Posted 3 years ago

Leuze electronic looks back at its 55-year success story

Posted 3 years ago

Leuze electronic launches new distance sensors

Posted 3 years ago

High-speed quality check with high-performance camera technology

Posted 3 years ago

Sensor data available globally: beyond the local company cloud

Posted 3 years ago

Smart Process Gating: Leuze reinvents light curtain muting

Posted 3 years ago

Intelligent sensor cable prevents downtime by predicting failure

Posted 3 years ago

Efficient automation of life science laboratories

Posted 3 years ago

Compact camera-based IPS200i sensor is quick to commission

Posted 3 years ago

Safety for man and machine

Posted 4 years ago

Safe position monitoring in industrial automation

Posted 4 years ago

Leuze electronic collaborates with Microsoft to accelerate IoT

Posted 4 years ago

High-performance sensors in a compact package

Posted 4 years ago

Non-contact, reliable detection of objects and fill levels

Posted 4 years ago

Light curtains for safeguarding packaging systems

Posted 4 years ago

New safety relays and safety controllers from Leuze electronic

Posted 4 years ago

New economical type 4 single-beam safety devices

Posted 4 years ago

CML 700i measuring light curtain features Profinet interface

Posted 4 years ago

See Industry 4.0-ready sensors at Hanover Messe 2017

Posted 4 years ago

Leuze electronic sensors for packaging machines at Interpack

Posted 4 years ago

White paper explains Industry 4.0 collaboration with Microsoft

Posted 4 years ago

New machinery risk assessment white paper from Leuze electronic

Posted 4 years ago

Data transmission photoelectric sensor with remote diagnostics

Posted 4 years ago

Optoelectronic safety devices cut machine tool cycle time

Posted 5 years ago

Reading 1D, stacked and 2D codes is quicker and easier

Posted 5 years ago

Safety locking devices feature uniquely coded RFID technology

Posted 5 years ago

Safety light curtain withstands shock and vibration

Posted 5 years ago

Avoiding overflow with light section sensors

Posted 5 years ago

See new smart sensors at Drives and Controls 2016

Posted 5 years ago

Safety laser scanners: what are the most important requirements?

Posted 5 years ago

Sensors and systems for intralogistics

Posted 5 years ago

Optical sensors are tolerant of target materials and finishes

Posted 5 years ago

New top-end laser scanner from Leuze electronic

Posted 5 years ago

Sensors for packaging

Posted 6 years ago

Setting up access guarding with muting is easy with MLDSET

Posted 6 years ago

Light section sensors: reliable detection of medicine packages

Posted 6 years ago

IO-Link and connectivity in the age of Industry 4.0

Posted 6 years ago

New warehouse, new sensors

Posted 6 years ago

AC/DC SR 49C all-voltage sensors now suitable for outdoor use

Posted 6 years ago

Smart cameras for smart inspection systems in beverage industry

Posted 6 years ago

Quality control with LRS 36 light section sensors at dairy

Posted 6 years ago

Leuze RSL 400 scanners are more versatile and easier to use

Posted 6 years ago

MLC safety light curtains now with integrated AS-i interface

Posted 7 years ago

Barcode positioning system with wide range of bus interfaces

Posted 7 years ago

Photoelectric sensor transmits Ethernet data interference-free

Posted 7 years ago

New guard switch incorporated in stainless steel hinge

Posted 7 years ago

CR 50 bar code reader for medical instrumentation

Posted 7 years ago

Pluggable relay module for safety controllers

Posted 7 years ago

Light-band RK46c-VarOS detects object over 50mm band area

Posted 7 years ago

Modular muting safety light beams - easy to specify and install

Posted 7 years ago

Two new ultrasonic sensors for switching and measuring

Posted 8 years ago

New high-performance sensor series 18B from Leuze

Posted 8 years ago

Bar code reader with Ethernet/IP interface

Posted 8 years ago

Leuze MSI safety relays now have interchangeable terminal blocks

Posted 8 years ago

Leuze's HRTR46B Teach opto-sensor is two sensors in one unit

Posted 9 years ago

Cylindrical photo-electric sensors with unique swivel mounting

Posted 9 years ago

Win a Blackberry Playbook at Drives & Controls 2012

Posted 9 years ago

New Leuze salesman for East Midlands and Central England

Posted 10 years ago

Three-dimensional sensing versus machine vision systems

Posted 10 years ago

Bin-picking robot is guided by laser profile sensor

Posted 10 years ago

New modular safety controllers from Leuze electronic

Posted 10 years ago

Free training on machinery safety and SISTEMA

Posted 10 years ago

Free machinery safety and safety controller training workshops

Posted 11 years ago

EN ISO 13849-1 simplified procedure for assessing PL

Posted 11 years ago

Three-beam multiple light beam safety devices save cost

Posted 11 years ago

Single device reads barcodes and 2D codes

Posted 12 years ago

Explosion-proof housings upgrade standard optical sensors

Posted 12 years ago

Smart camera features improved integral lighting

Posted 12 years ago

Free brochure for Leuze Electronic's SOLID safety light curtains

Posted 12 years ago

Leuze electronic continues to expand UK operations

Posted 12 years ago

New Managing Director for Leuze Electronic UK

Posted 13 years ago

Optical sensor saves cost in high-bay warehouses

Posted 13 years ago

Laser distance sensor offered with a choice of spot sizes

Posted 13 years ago

New catalogue for Leuze machine safety products

Posted 13 years ago

Forked sensor offers higher processing speed

Posted 13 years ago

Optical sensors gain EHEDG certification

Posted 13 years ago

Ultrasonic forked sensor achieves higher processing speed

Posted 13 years ago

New catalogue of photoelectric sensors

Posted 13 years ago

Photoelectric sensor for small targets is ultra-compact

Posted 13 years ago

Ruggedised safety light curtains have 14mm resolution

Posted 14 years ago

Tougher safety light curtains to be shown for the first time

Posted 14 years ago

Tactile safety devices explained

Posted 14 years ago

Ultra-compact opto sensors have big specification

Posted 14 years ago

Safety light curtains cope with arduous environments

Posted 14 years ago

Laser measuring sensor achieves +/-3mm over 200mm

Posted 14 years ago

Can Character Verification System checks text on concave end

Posted 14 years ago

Safety light curtains are sealed to IP68

Posted 14 years ago

Measuring light curtain helps check pallet stability

Posted 14 years ago

Ethernet-enabled device reads damaged bar codes

Posted 14 years ago

More news

Login / Sign up