What are the most common secondary entrapment devices used in gated access systems today?
The answer to this question is dependent upon the type of gate installation. While non-contact and contact sensors (type B1 and B2 in the chart) will meet this requirement for all slide, vertical lift and vertical pivot gate operator systems, they will not meet the requirement in Class I or Class II swing or barrier gate operator systems (but will work for Class III and IV in these applications). In this later case, since these are the most exposed to general public use, the secondary system requirement can only be met by an inherent system, either as above or as an adjustable clutch or pressure relief device. As a result, most slide, vertical lift and vertical pivot gate operator systems, they will rely on external non-contact and contact sensors to meet the secondary system requirements while most swing and barrier gate operator systems will utilize the inherent adjustable clutch or pressure relief valve to meet the secondary system requirements. It is not unusual to find multiple se
