Catalogs > Safety Products Catalog > Presence Sensing Safety Devices > Safety Mats > Overview
Overview
| Introduction |  |
Chemical Resistance of Sensor Mat Vinyl Covering | |
Anatomy of a Mat System | |
Standards | |
Application Details | |
Safety Distance Calculations ANSI/RIA R15.06
The minimum distance calculated is the minimum horizontal distance from the outer edge of the MatGuard sensor mat detection zone to the nearest part of the hazard. The formula for floor mounted safety mats is:
Ds = [K x (Ts + Tc + Tr)] + Dpf
- Ds is the minimum safety distance.
- K is a minimum speed constant based on the movement of the hand/arm only and the body being stationary.
K=1600 mm/s (63 in./s)
- Ts is the worst stopping time of the machine/equipment.
- Tc is the worst stopping time of the control system.
- Tr is the response time of the safeguarding device.
- Dpf is the depth penetration factor which is the maximum travel towards the hazard within the safety mat area that may occur before a stop is signalled.
Dpf=1200 mm (48 in.)
The response time of the machine and control system used in the calculation must be the worst case. Some machines have inconsistent response times that are dependent upon mode of operation, nature of the work piece and point in the operating cycle at which stopping is initiated. An allowance should be made for wear in brakes, temperature, aging of components, etc., if this can affect the response time. An allowance for further delays in the machine control system may be required in some circumstances.
Calculation Example
In this example, the MatGuard system is being used with a machine and control system with a worst-case response time measured at 0.485 seconds. The system is on a flat surface, it is not on a raised platform. Using the formula above.
| T | = | Ts + Tc + Tr 0.035 + 0.485 0.520 s |
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| S | = | (63 x 0.520) + 48 80.76 in. |
Sensor mats will be required from 2032 mm right up to the edge of the machine base plate.
Safety Distance Calculations EN999
The minimum distance calculated is the minimum horizontal distance from the outer edge of the MatGuard sensor mat detection zone to the nearest part of the hazard. The formula for floor mounted safety mats is:
S = [1600 x (t1 + t2)] + (1200 – 0,4H)
- S is the minimum safety distance in mm in a horizontal plane from the danger zone to the detecting edge of the device furthest from the danger zone.
- 1600 is a minimum speed constant based on the movement of the hand/arm only and the body being stationary.
1600 mm/s = 63 in./s
- t1 is the maximum time between the actuation of the sensing function and the output signal switching devices being in the off state.
- t2 is the maximum response time of the machine, i.e., the time required to stop the machine or remove the risks after receiving the output signal from the protective equipment.
- 1200 is the depth penetration factor which is the maximum travel towards the hazard within the safety mat area that may occur before a stop is signalled.
1200 mm = 48 in.
- H is the distance above the reference plane, e.g., floor, in millimeters.
The response time of the machine and control system used in the calculation must be the worst case time. Some machines have inconsistent response times that are dependent upon mode of operation, nature of the work piece and point in the operating cycle at which stopping is initiated. An allowance should be made for wear in brakes, temperature, aging of components, etc., if this can affect the response time. An allowance for further delays in the machine control system may be required in some circumstances.
Calculation Example
In this example, the MatGuard system is being used with a machine and control system whose worst case response time has been measured as 0.485 seconds. The system is on a flat surface, it is not on a raised platform. Using the formula above,
| T | = | t1 + t2 0.035 + 0.485 0.520 s |
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| S | = | (1600 x 0.520) + 1200 832 + 1200 2032 mm |
Sensor mats will be required from 2032 mm right up to the edge of the machine base plate.