下落式金属探测器一般都带有自动剔除装置，所以习惯称呼下落式金属探测器，或者金属探测器。金属探测器对产品的包装要求是不能含有金属、但是考虑到密封性、避光性等较高的要求，必须采用金属复合膜进行包装。金属复合膜其本身就是金属，所以用通道式金属探测器的话，检测灵敏度就会有大的偏差，甚至无法检测。鉴于上述原因，可以选择在包装前进行检测。下落式金属探测器就是针对上述情况而被开发出来的，主要用于如药片、胶囊及颗粒状（塑料粒子等）、粉末状物品的检测。当这些物品下落通过下落式金属探测器时，一旦检测到金属杂质，系统即刻启动分离机构排除可疑物品。具有安装简单、灵敏度高、维修方便，效率高、稳定可靠等特点。
Falling metal detector is usually equipped with automatic elimination device, so it is used to be called falling metal detector, or metal detector. The packaging requirement of metal detector is that it can not contain metal, but considering the high requirements of sealing and light shielding, metal composite film must be used for packaging. The metal composite film itself is metal, so if the channel metal detector is used, the detection sensitivity will have a large deviation, or even can not be detected. In view of the above reasons, we can choose to test before packaging. Falling metal detector is developed for the above situation, mainly used for the detection of tablets, capsules, granular (plastic particles, etc.), powder goods. When these items fall through the falling metal detector, once the metal impurities are detected, the system will immediately start the separation mechanism to eliminate the suspicious items. It has the characteristics of simple installation, high sensitivity, convenient maintenance, high efficiency, stability and reliability.