Signalization in industry plays a key role in ensuring safety and the smooth operation of production processes. Signaling devices, such as acoustic or optical alarm devices, are used to inform operators about emergencies, abnormalities, or hazards. This article will present the most popular signaling devices used in industry and their functions. It will also outline the requirements that a good industrial signaling device should meet.
Acoustic and optical alarm devices – key elements of industrial signaling
Signaling devices, including audible alarm devices (acoustic) and visual (optical) signalizers play a warning and informational role in various industrial sectors. The sound or light signal generated by such devices is designed to immediately convey information about emergency situations or issues requiring attention. Acoustic alarm devices are commonly used to indicate malfunctions or abnormalities in the operation of industrial machines. In contrast, visual signaling – most often through the activation of specific optical segments of the device – informs about the status of a device or system.
Signal column,or signal tower can combine the functions described above, generating both light and sound signals. This makes the signaling system more efficient, allowing for faster responses to potential hazards. Such signaling devices are particularly useful in production lines, where machine operators must react to changes in their status in real-time.
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Requirements for signaling devices in industry
Each signaling device, whether acoustic or optical, must meet specific safety standards and requirements. Only in this way can the protection of employees' lives and health be ensured. The details in this regard are outlined in Directive 2006/42/EC of the European Parliament and Council of May 17, 2006, on machinery, amending Directive 95/16/EC. In section 1.7.1.2, it specifies the requirements for warning devices:
- In cases where the health and safety of individuals may be at risk due to a defect in the operation of a machine left unattended, the machine must be equipped with an appropriate signaling device acoustic or optical warning signalization.
- Where the machine is equipped with warning devices, the signals of these devices must be unambiguous and easily visible. The operator must always be able to check the operation of warning devices.
- The requirements of specific Community directives relating to safety colours and signals must be complied with.
In industrial environments, noise and intense lighting can make it difficult to notice signals generated by signaling devices. For this reason, it is recommended to use equipment that can engage multiple senses, i.e., devices capable of generating both an audible signal at the required level and an optical signal (continuous or flashing). LEDs are most commonly used as a light source, while xenon lamps or traditional light bulbs are less frequently used. In some spaces, the use of a voice signaling device may be a good solution for example SG-Wgw2 IP65, which generates a alarm signal in the form of a verbal announcement with specific content.
It is also important to consider the appropriate level of protection (IP rating) of devices against external factors (classified according to the EN 60529 standard), such as dust and moisture. Additionally, signaling devices often operate in harsh conditions where they may be exposed to mechanical damage. Manufacturers of signalers increasingly declare the degree of mechanical resistance (IK rating), which is classified according to the EN 62262/EN 50102 standard. In areas where there is a particular risk of damaging the device's structure, special protective covers made of steel wire can be used to provide additional protection against mechanical damage. It is also important to consider the environment in which the specific device is intended to operate. In some cases, the design of the signaler should be resistant to UV radiation (e.g., for outdoor installation), high levels of sulfurization (e.g., in factories), or extreme temperatures (e.g., in cold storage or power plants). The market also offers devices in special explosion-proof designs, marked as EX, which are suitable for use in explosion hazard zones. Requirements in this area are defined by the ATEX directive.
Application of signaling devices in industrial automation
In industrial automation systems, signaling devices play a crucial role as an essential component of monitoring and alarm systems. Thanks to advanced systems, signaling devices can transmit real-time information about the condition of machines, enabling operators to take prompt action in the event of a failure or malfunction. Furthermore, some of the solutions available on the market allow communication via Ethernet and support Modbus and HTTP protocols, making them compatible with existing infrastructure. Data exchange enables remote monitoring and diagnostics of machines, which helps shorten response times and facilitates quicker fault resolution.
Signaling systems in industrial automation can generate a variety of alarm signals, both acoustic and optical. Devices that signal a failure are used not only in production processes but also in other industrial sectors, such as transportation and energy. This allows for quick warnings of potential hazards, significantly improving both the safety of individuals and operational efficiency.
Alarm signals – the key to industrial safety
Alarm signals are one of the most important components of signaling systems, particularly in the context of the health and safety of individuals working in industrial environments. Signaling devices, generating both audible and visual signals, serve as an early warning system for potential hazards, such as power failures, machine malfunctions, or other abnormalities in the production process.
Alarm signaling should be intense enough to immediately capture the attention of the operator or worker. At the same time, the signals must be unambiguous to prevent any misunderstandings. For this purpose, various colors and sounds are used to indicate the level of danger. For example, a red light signal and a loud audible alarm may indicate a critical failure, while a yellow optical signal and a softer sound could warn of a minor issue. The green color generally indicates the normal operational state of the machines. Acoustic signaling also carries its own unique meaning and can be used to further specify the type or urgency of the situation.
Examples of the meaning of acoustic and optical signals that an industrial signaling device can generate:
Power reliability in signaling systems
Signaling devices in industry require proper power supply to ensure their correct operation in any situation. Depending on the type of device, the supply voltage can range from 12 V to 230 V. It's important to note that in the event of a power failure, some signaling devices are equipped with emergency power systems that allow them to continue functioning.
Failure signaling devices, both acoustic and optical, must operate reliably even in challenging conditions, which requires proper safeguards and adaptation to the working environment. Emergency power supply can be crucial, especially for alarm systems designed to protect the lives and health of employees when there is a power outage.
Summary
Industrial signaling, encompassing a variety of devices such as acoustic, optical alarm devices, and combinations of both, plays an invaluable role in ensuring safety and the efficiency of production processes. The use of appropriate failure signaling devices, such as signal towers or columns, allows for quick responses in crisis situations, significantly reducing the risk of accidents and breakdowns. Signaling devices that comply with safety requirements and standards form the foundation of effective industrial signaling, aimed at protecting the health and safety of individuals working in challenging industrial environments, as well as minimizing potential downtime due to faults or failures. Industry is a specific sector of the economy that requires solutions tailored to the needs of each facility (e.g., appropriate IP protection rating).
