Safety grating is a commonly used safety protection equipment in industry, and there are two types of common safety gratings: normally closed and normally open. When choosing a safety grating, there are some differences in safety performance between the normally closed type and the normally open type, and it is generally believed that the normally closed type is safer for the following reasons:
First of all, the normally closed safety light curtain is closed in normal working condition and will only open when triggered, which means that when the system fails or the signal is lost, the safety light curtain will automatically start, stopping the machine or equipment in a safe state and reducing the risk of accidents. In contrast, normally open safety light curtains remain open in the event of a system failure, which can lead to equipment being in a non-safe state and increase the likelihood of accidents.
Secondly, the normally closed safety light barrier requires continuous power to keep it closed, and once the power is interrupted or cut off, the light barrier will be opened immediately, this power loss protection mechanism can quickly stop the equipment in a safe state and avoid accidental injury. The normally open safety light curtain will continue to remain open in the event of a power loss, which may cause the equipment to continue to operate and increase the risk of accidents.
In addition, normally closed safety light curtains are often used for the strict control of hazardous areas and can only be opened if safety is ensured, thus ensuring maximum safety in the work area. Once the normally open safety grating is triggered, it may cause dangerous conditions, personal injury or equipment damage due to operation errors or other reasons.
To sum up, although normally closed safety gratings can also provide good safety protection under specific circumstances, from the perspective of principle and practical application, normally closed safety gratings are considered to be more safe and reliable due to their own characteristics, which are easier to ensure the safety of equipment and personnel. When choosing to install a safety light curtain, the user should consider the normally closed or normally open type according to the specific needs and safety requirements to ensure the safety and protection of the working environment.
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