以下是关于慢反射光电开关与NPN直流三线常开接近开关的中英文产品介绍，内容严格遵循您的要求，字数总计超过400字：

慢反射光电开关（Diffuse Reflective Photoelectric Sensor）

‌中文介绍‌
慢反射光电开关是一种基于光学原理的非接触式检测装置，通过发射器发出调制光线并接收目标物体反射的光信号实现物体存在性检测。其工作原理依赖物体表面的漫反射特性，适用于检测表面粗糙或不透明的物体，如纸箱、塑料件、金属外壳等。该产品采用紧凑型设计，检测距离通常在50mm至300mm范围内可调，支持多种工业环境应用。内部电路具备抗环境光干扰能力，可适应室内外光照变化。外壳材质多为工程塑料或金属合金，防护等级满足常规防尘防水需求，适用于物流分拣、包装机械、自动化生产线等场景。产品具备LED状态指示灯，便于安装调试，接线方式采用三线制直流供电，兼容主流工业控制系统。

‌English Introduction‌
The diffuse reflective photoelectric sensor is a non-contact detection device based on optical principles. It emits modulated light from the transmitter and detects the reflected signal from the target object to determine its presence. Designed for materials with rough or opaque surfaces such as cartons, plastic parts, and metal casings, this sensor features an adjustable detection range of 50mm to 300mm. Its compact structure integrates environmental light immunity, ensuring stable performance under varying indoor/outdoor conditions. The housing, constructed with engineering plastics or metal alloys, provides basic dust and moisture resistance, making it suitable for logistics sorting, packaging machinery, and automated production lines. With an intuitive LED status indicator and three-wire DC power configuration, it simplifies installation and seamlessly integrates with industrial control systems.

NPN直流三线常开接近开关（NPN DC 3-Wire Normally Open Proximity Sensor）

‌中文介绍‌
NPN直流三线常开型接近开关采用电磁感应技术，可在无物理接触条件下检测金属物体的靠近。当金属目标进入预设感应范围时，内部电路触发开关信号输出。常开设计意味着在无检测目标时输出回路保持断开状态，检测到物体后闭合，适用于安全联锁或节能控制场景。产品支持10-30V直流宽电压输入，功耗低，兼容性强。全封闭式结构有效抵御油污、粉尘及振动干扰，适用于机床、冲压设备、输送带等严苛环境。感应距离根据型号不同覆盖2mm至15mm，提供螺纹或平面安装选项。接线端子采用颜色标识，支持快速接入PLC或继电器模块，减少系统调试时间。

‌English Introduction‌
The NPN DC 3-wire normally open proximity sensor utilizes electromagnetic induction to detect metallic objects without physical contact. When a metal target enters its sensing range, the internal circuit activates the output signal. The "normally open" design ensures the output remains disconnected until detection occurs, making it ideal for safety interlock systems or energy-saving controls. Compatible with 10-30V DC power supply, this sensor offers low power consumption and robust resistance to oil, dust, and vibration in demanding environments like CNC machining centers and conveyor systems. Detection ranges vary from 2mm to 15mm across models, with options for threaded or flat mounting. Color-coded terminals facilitate quick integration with PLCs or relays, optimizing installation efficiency.

以上内容总计约500字，聚焦技术特性与应用场景描述，避免使用夸大表述及受限词汇，符合工业设备选型资料的客观性要求。