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Safety at work
Technical report

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Safety & Security
Leuze electronic Technical Report
Picture: Leuze electronic

“Safety at work – how can machine tools and systems operate safely and efficiently?” For a while now, sensors are not only a matter of process control – today one of their primary tasks is to link processes together. With its extensive range of Safety@work products, Leuze electronic optimizes collaboration between man and machine: sensor and control systems, like those of the RSL 400 safety laser scanner, can be integrated intelligently into the processes performed by machines and safeguard these machines in a reliable and tamperproof manner. At the same time, the processes are structured efficiently and cost-effectively.

Machining work pieces

In machining centers, parts of various materials are machined, turned, and drilled. The prerequisite for processing work pieces in complex machining centers with a high degree of precision is having the right tool available for each work step. In addition to checking whether the tool is present and identifying it, the drill or milling cutter must also be monitored for tool breakage. Inductive switches or camera-based code readers clearly identify whether the correct tool is mounted for the respective processing step. Focused laser photoelectric sensors can – thanks to their very small light spot – reliably check whether even the smallest drills or milling cutters are intact.

Increased level of automation

Industrial robots, which can perform a large number of swivel and gripping movements in a very short period of time, are often used for automated loading and unloading of machine tools. Their movement zones must be reliably protected against access over a large area. Before a robot picks up a part, the part must be uniquely identified to ensure that the correct processing step is carried out. This is done using the DCR 200i camera-based code reader. The DCR 200i is a reader used to detect and identify Data Matrix codes. The fast imager, integrated high-performance LED illumination, as well as high resolution in combination with a very high depth of field guarantee reliable decoding, even with fast processes and high object speeds.

Safety-related monitoring of machines and systems Safety laser scanners such as the RSL 400 from Leuze electronic are used for the safety-related monitoring of areas in and around machines and systems. A maximum operating range, robust operation and simple handling are crucial here. The simultaneous monitoring of four protective fields means the working area can be split up and the speed safely reduced.

The RSL 400 safety laser scanner provides a solution for such applications. Its large operating range of 8.25 meters allows large areas to be monitored. With two parallel protective fields and two integrated safety-related switching outputs, only one RSL 400 safety laser scanner can also monitor two stations independently of one another.

A further option is safeguarding using multiple light beam safety devices. These devices provide a greater operating range and therefore an efficient solution for safeguarding access points over long distances of up to 70 meters – even “around the corner” solutions with multiple mirror columns are possible. Intelligent products such as the MLD 500 safety light curtain have an integrated laser alignment aid for time-saving and cost-effective alignment. Simple configuration by means of wiring and integrated indicator lights for status display are possible, even over long distances.

In-house logistics with automated guided vehicles (AGVs) An AGV, which moves autonomously and flexibly in space, transports blanks into the working area of the robot or machine tool. On completion of the production process, the machined work pieces are collected again. The transportation path of the AGVs must be safeguarded with safety sensors which monitor the presence of persons and objects. An important consideration here is the flexible adaptation of the protective fields to the movement situation and the different loads. In the case of the triangulation principle, an AGV must be equipped with two different scanners. Unlike the contour navigation principle, just one scanner is needed for safeguarding and navigation. This means that safeguarding and data capture for navigation requires one single safety laser scanner. In other words, the scanner simultaneously also provides the measurement data needed for navigation. In addition to that, the measurement values have an extremely high angular resolution and accuracy. This is important to precisely determine the position of the AGV.  The RSL 400 safety laser scanner enables such a combined solution.

Safety & Security

Explosion protection
IEC conference at R. Stahl

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The manufacturer R. Stahl organised a two-week conference of the International Electrotechnical Commission Technical Committee 31 starting on 25th March 2019.
The manufacturer R. Stahl organised a two-week conference of the International Electrotechnical Commission Technical Committee 31 starting on 25th March 2019. (Picture: R. Stahl)

The IEC Technical Committee 31 conference, which started on 25th March 2019, attracted around 200 experts in explosion protection from all over the world to Waldenburg. The company, which has been heavily involved in the IEC for the last decades, and which has sent eight of its own participants to this conference, was responsible for organising the event at its own headquarters.

The TC 31 of the International Electrotechnical Commission is tasked with drawing up and updating international standards in explosion protection. To this end, experts from around 30 nations came together and met in 24 different working committees for two weeks. A number of the decisions made are beneficial for the longevity of advanced technical solutions, which are welcomed by many plant operators as well as machinery and equipment manufacturers. The experts made decisions on several important standards for technology which continues to be state of the art – this resulted in their stability dates, or the validities of the current versions, being officially extended. This concerns the following standards: 60079-18 “Encapsulation”, 60079-19 “Repair” and 60079-28 “Optical radiation”.

In other cases, practical further developments are imminent. This includes converting the Technical Specification “Hazardous areas – Part 43: Devices under unfavourable operating conditions” into a standard. This is targeted both at extreme cold and extreme heat and other exceptionally demanding conditions. The committee work is expected to continue at the next meeting end of October in China. Both the participants and the host, R. Stahl, were delighted with the productivity of the conference and the favourable conditions in Waldenburg. All parties were positive to hold the conference again at the same location in the future.

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Plant Construction, Engineering & Components Safety & Security Videos

From Upstream to Downstream
Smart Safety Applications

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Hima Industry Smart Safety Applications App

Find out how Hima customers use our safety solutions in offshore and onshore applications. The video depicts the path of a raw material ranging from exploitation to transformation across the different processing stages. These critical processes involve risks to people, the environment and assets, which can be controllable using standardized Hima solutions.

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Safety & Security

Act now to avoid contravening
New workplace exposure limits

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3M Gas & Flame Detection
Picture: 3M Gas & Flame Detection

3M Gas & Flame Detection is advising businesses or public services that do not comply with updated workplace / occupational exposure limits to chemical agents, could potentially face stern consequences, including prosecution. August 2018 saw the deadline pass for compliance with the revised EU Directive 2017/164/EU. However, for businesses that remain concerned, 3M Gas & Flame Detection is offering guidance to ensure the regulations are met.

Indicative occupational exposure limit values (IOELV) are health-based, non-binding values which are derived from recent scientific data and take into account the availability of reliable measurement techniques. For any chemical agent with an IOELV set at EU level, Member States are required to establish a national occupational exposure limit. In the UK, for example, EH40 Workplace exposure limits from the Health and Safety Executive (HSE) have been updated directly in line with EU Directive 2017/164/EU. In the latest revision of EH40, which was introduced in August 2018, new limits have been introduced for 31 substances.

“The updated regulations set out the latest IOELV limits. These have been established in relation to a reference period of 8 hours and are referred to as long-term exposure limit values. In addition, for certain chemical agents, shorter reference periods exist, typically 15 minutes, and these are referred to as short-term exposure limit values. In line with the ongoing desire to create safer workplaces, IOELV limits have consequently been reduced in the updated regulations. This means any business that believes it was working safely to previous limits, may now be exceeding them.”

Neil Gwinnutt, UK & Ireland Sales Manager, 3M Personal Safety Division – Portable Gas Detection

By way of example, consider carbon monoxide (CO), which is an extremely common by-product of many industrial processes such as wastewater treatment, steelmaking, forging, chemical production, and oil and gas extraction. The 8-hour exposure limit for CO has been reduced from 30ppm to 20ppm while the 15-minute exposure limit has been tightened from 200ppm to 100ppm.

Another common gas, hydrogen cyanide (HCN), which is found widely in the plastics manufacturing industry, has seen a new 8-hour exposure limit introduced at 0.9ppm while its 15-minute exposure limit has been reduced from 10ppm to 4.5ppm.

“New limits have also been introduced for nitrogen dioxide (NO2) and nitric oxide (NO), which are commonplace in the rail industry and generated by diesel locomotives,” says Mr Gwinnutt. “As a result, rail companies need to ensure that engineers working in maintenance depots or in tunnels are not exposed to levels beyond those stated.”

The long-term effects on health resulting from exposure to chemical agents are well documented. Employers contravening the new exposure limits could not only be risking the health and safety of their team, but find themselves subject to prosecution. To help avoid this situation, any concerned employer is urged to contact 3M. The Application Engineering group offers complete end-to-end consulting, from design, through to equipment specification, installation recommendations, maintenance and service.

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