Clamp forces of power driven radiation protection doors must be limited, in order to prevent broken bones, contusions or head injuries by pinching, shearing, knocking over or pulling in by the power operated radiation protection door. In order to guarantee this for all our doors, in addition to the initial testing by a recognized institution, we measure the clamp forces of all our doors during the start-up procedure and add the testing records to the documentation.
To verify that your radiation protection door’s clamp or operational forces are not too high, you can perform the simple test, as described below. You need to get a 20 mm thick standard Styrodur plate (material 2800 C) from your local D-I-Y store. Out of this plate you cut strips of 65 mm width and 400 mm length.
First you take two of these prepared strips on top of each other and press them firmly against the counter closing edge of your gate. Then you close the door and check if one or both Styrodur strips have been damaged. If both strips are still intact, repeat the test with just one strip. If at least one strip is damaged by this test, you should call an experienced inspector, who can measure the precise clamp or operational forces of your power driven gate system. If the strips remain undamaged, it will be sufficient if you ask the expert, who performs the yearly maintenance, to measure the closing forces and to give you the measurement records.
The following video was recorded to better visualize an approximate estimation as well as a precise measurement of the clamp or operational forces with the proper measuring tool.