Another important element of the calculation is the depth penetration factor (Dpf). This refers to how far into the protective field an object can travel before it is detected by the light curtain. The calculation is dependent on the mounting orientation and resolution (in millimeters) of the light curtain.
MOS in turn determines a light curtains Dpf (depth of penetration factor). Dpf is the distance you can potentially reach into the light curtain field before being detected. For Shadow systems the MOS is ” without the use of blanking. For a Shadow without blanking this equates to ”.
T = Maximum time required by the machine to stop + response time of the light curtain d = Detection capability of the light curtain Note: If S is greater than or equal to mm ", perform the calculation again with K equal to ". If the newly calculated result gives S less than or equal to mm ", set S to mm ". Depth penetration factor. It is an added distance to allow for how far into the protective field an object, such as a finger or hand, can travel before being detected. D pf is related to the safety light curtain’s object sensitivity. Object sensitivity is the smallest diameter object which will always be detected anywhere in the sensing field.
Calculating Safety Distance of Safety Light Curtains. Penetration factor, Dpf, for presence-sensing devices used in a vertical application with object sensitivity less than 64 mm ( inches) Dpf, the distance added to the safety distance due to the penetration factor compensates for varying object sensitivities of electro-optical presence-sensing.
Example: Using the ANSI formula, a light curtain response time (Tr) of 15ms, a machine stopping time (Ts+Tc) of ms, a brake monitor response time (Tbm) of 40ms and a inch depth of penetration, the calculation would be as follows (Remember that the hand speed constant, K, is set by OSHA at 63 inches per second). Another factor includes the penetration distance (D pf), which is based on the light curtain's MOS (minimum object sensitivity). The following formula is used to compute the minimum safety distance (D s) on mechanical power presses to meet the ANSI (American National Standards Institute) B Press Safety Standard.
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The depth penetration factor compensates for varying object sensitivities of electro-optical presence sensing devices. Accurate calculation of the minimum safe mounting distance for many safeguarding devices can ensure the safety of personnel while conserving floor space and maximizing throughput.