The UL Recognized Component Mark means that the product has been tested as a component. These components will later be used in complete end-products or systems. Some additional installation precautions may be required. 例如, 您可能需要在房屋安装的组件，以提供保护免受灰尘, liquids and impact and cabling may have to be installed in a cable tray or protected in such a way that it would not be damaged. “ SLA5800系列热式质量流量计/质量流量控制器 和 压力控制器, 和 quantim IP40，质量流量计/质量流量控制器 UL认证.
UL认证是两个更严格和建议，如果设备直接安装在一个司 2 或区 2 hazardous area. If the device is being installed in a larger system that will provide additional protection then you might consider UL Recognized. When in doubt call 布鲁克斯客户服务 他们将帮助你做出正确的决定，关于批准要求.
There is plenty more to talk about when it comes to approvals and registrations but I think that is enough for one day. We can touch on ATEX approvals, 国际IEC标准, Canadian CRN registrations and NEMA/IP water tight ratings another time. Stay tuned.