Industrial Safety<\/a>, establishes the following methods for calculating the minimum safety distance for each type of safety device, based on the stopping time of the hazardous movement, which must be determined using a stopping time analyser and periodically verified through testing.<\/p>\nThe units used in the formulas for calculating safety distances will henceforth be:<\/p>\n
S: millimetres<\/p>\n
T: milliseconds.<\/p>\n
Each type of safety device has its own formula:<\/em><\/p>\nSafety Distance: Photoelectric Curtain<\/h2>\n
When determining the minimum safety distance, the resolution or detection range of the curtain\u2019s smallest object must be taken into account:<\/p>\n
Resolution d=<40 mm<\/p>\n
The following formula will be applied:<\/p>\n
S=(2000 x T) + 8(d \u2013 14)<\/p>\n
Where:<\/p>\n
S = Safety distance between the detection plane and the hazardous area, in mm.<\/p>\n
T = Total downtime in seconds: includes machine downtime + the response time of the photoelectric sensor.<\/p>\n
d=Curtain resolution in mm.<\/p>\n
The minimum distance between the detection plane and the dangerous area must in any case be 100 mm (min.).<\/p>\n
If the distance obtained is S > 500 mm, the standard permits the use of the following formula, provided that the minimum distance of 500 mm is observed:<\/p>\n
S=(1600 x T) + 8(d \u2013 14)<\/p>\n
Photoelectric curtains used to detect the start of hazardous movements must have a resolution of 14 mm or less and a minimum safety distance S of 150 mm, calculated using the following formula:<\/p>\n
S=2000 x T<\/p>\n
Resolution 40mm<d<70 mm<\/p>\n
The standard classifies them as discrete-beam photoelectric devices and does not consider them suitable for detecting hand intrusion. The formula to be used in this case is:<\/p>\n
S=(1600 x T) + (1200 \u2013 0,4H)<\/p>\n
H = height of the upper beam in mm.<\/p>\n
In addition, the height of the lower beam must be 300 mm or less.<\/p>\n
Single-beam or multi-beam photoelectric barrier<\/h2>\n
They should only be used for detecting bodies or body parts in the direction of the dangerous area.<\/p>\n
The following formula will be applied:<\/p>\n
S=(1600 x T) + (1200 \u2013 0,4H)<\/p>\n
H= height of the upper beam in mm.<\/p>\n
Depending on the number of beams, the heights at which they must be placed are reflected in the following table:<\/p>\n
No. of beams Ground height mm<\/p>\n
4 300, 600, 900, 1200<\/p>\n
3 300, 700, 1100<\/p>\n
2 400, 900<\/p>\n
Single-beam photoelectric barrier<\/h2>\n
This option can only be used for detecting people. The device must be positioned at a height of 750 mm above the reference plane.<\/p>\n
The minimum safety distance is given by the following formula:<\/p>\n
S=(1600 x T) + 1200<\/p>\n
Safety Distance: Sensitive Mat<\/h2>\n
The EN ISO 13855 standard for pressure-sensitive devices states that the minimum width for a safety-sensitive carpet is 750 mm.<\/p>\n
The safety distance S in mm must be measured between the danger zone and the outer edge of the carpet that is sensitive to touch. This distance must be calculated using the formula:<\/p>\n
S=(1600 x T) + (1200 \u2013 0,4H)<\/p>\n
H = Height of the carpet above the floor in mm.<\/p>\n
Floor-mounted<\/p>\n
If the carpet is laid directly on the floor surface, the height H will be zero, and the following formula applies:<\/p>\n
S=(1600 x T) + 1200<\/p>\n
Installation on steps<\/p>\n
If the carpet is laid on a step or raised platform above floor level, the general formula for carpets applies, but the minimum distance of 750 mm may be reduced by 0.4H, where H is the height of the carpet above the floor:<\/p>\n
S=(1600 x T) + 1200<\/p>\n
Two-handed control<\/h2>\n
If access to the hazardous area is protected by another safety device (such as a light curtain), the two-hand control may be positioned at a minimum distance S of 100 mm from the hazard.<\/p>\n
Otherwise, the distance between the pushbuttons and the hazardous area shall be calculated using the following formula:<\/p>\n
S=(1600 x T) + 250<\/p>\n
Fixed Touchpad<\/h2>\n
If access to the danger zone is protected by another safety device, the fixed proximity switch may be positioned at a minimum distance of 100 mm.<\/p>\n
Otherwise, the distance between the button and the dangerous area will be calculated according to the formula:<\/p>\n
S=(1600 x T) + 1800<\/p>","protected":false},"excerpt":{"rendered":"
Todo sobre la norma EN-ISO13855 La norma EN-ISO13855 dentro del \u00e1mbito de la Seguridad Industrial, establece los siguientes m\u00e9todos para el c\u00e1lculo de la distancia de seguridad m\u00ednima para cada tipo de dispositivo de seguridad, en funci\u00f3n del tiempo de parada del movimiento peligroso, que debe ser determinado mediante un analizador de parada y revisarse […]<\/p>\n","protected":false},"author":7,"featured_media":2436,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[32],"class_list":["post-2428","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-seguridad-industrial","tag-seguridadindustrial"],"yoast_head":"\n
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