Light curtain calculation depth penetration factor

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The effective sensing field of the device shall be located at a distance from the nearest recognized hazards such that the operator or others cannot reach the hazard with a hand or other body part before cessation of motion during the hazardous portion of the machine cycle. The point at which a device responds to an intrusion may vary. The devices should be located or adjusted such that the device always responds to the intrusion at or prior to the safety distance.

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However, many times the Employee is not adequately protected because of the safe distance not being established or incorrectly applied. Presence sensing safety devices, such as Light Curtains, are considered non-separating guarding as there is no physical barrier between the operator and hazard. Integrating a Light Curtain that is not positioned at the minimum distance from the hazard, or that can be reached around or over, is not effective and provides a false sense that the process is safe.

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Chris Soranno Sep 10, Safeguards either must prevent entry into a hazardous area or detect entry into the hazardous area and eliminate the hazard before it can present a danger. Guards physical barriers must be designed to keep individuals from reaching the hazard.

Figure Safety distance from the hazardous point. US Safety Distance Formula. This distance, referred to as the safety distance, must be properly calculated prior to determining the safety light curtain protective height and mounting the light curtains on the machine. Failure to properly calculate this safety distance may result in operator injury.

When installing a safety light curtain or other electrical detection protective device, refer to the minimum required distances for stopping the machine prior to the body reaching the hazardous zone when the body enters the detection zone. These distances are defined in standards such as ISO When installing a light curtain, be sure to provide the safety distance minimum distance determined by sources such as the standards, regulations, and laws of the country or area in which the light curtain will be used.

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Calculating Safety Distance When installing safety light curtains, a minimum safe distance that the light curtain can be mounted from the point of hazard must be calculated. The distance between the hazard and the light curtain must be such that the time it takes the operator to reach the hazard with respect to approach speeds of parts of the human body is greater than the stopping time of the machine. In the United States there are two formulas that are used to properly calculate the safety distance.

JavaScript seems to be disabled in your browser. For the best experience on our site, be sure to turn on Javascript in your browser. For safety distance calculations, ISO defines the distance as follows:.

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Formula and Examples. The Safety separation distance formula for U. The minimum distance formula for European applications:.

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When attempting to safeguard a piece of automation equipment using electrical safeguarding devices such as light curtains, area scanners and safety mats, careful consideration must be taken to ensure they are not just placed in an arbitrary location that is convenient to install or mount. Many factors must be considered when performing a safety distance calculation. As machinery and processes continue to become faster and more complex the need to be aware of, and continue to strive for improved safety measures has never been more at the forefront of electrical control system design then it is today.

When safeguarding your machinery, it is not enough to simply install a light curtain s and assume that the machine is now safe. This post explains how to calculate safety distance for light curtains. Then, once installed, use a stop time measurement STM device to calculate how quickly the machine stops, and use this value to determine the minimum safety distance required.

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