Both sensor families detect an object without touching it, but they answer different questions. An inductive proximity sensor reacts to metal only; a capacitive proximity sensor reacts to almost anything that changes the dielectric constant in front of its face – plastic, granules, liquids, glass. Picking the wrong family is the most common reason a proximity sensor “works on the bench and fails on the line”.
两类传感器对比
| Property | 电感式（M18，8 mm） | 电容式（M30，15 mm） |
|---|---|---|
| 检测对象 | 仅金属（磁性与非磁性均可） | 几乎任何材质：塑料、液体、颗粒、玻璃、木材 |
| 典型检测距离 | 8 mm | 15 mm（灵敏度可调） |
| 能否隔容器壁检测 | 不能 | 能 – 隔塑料或玻璃测液位 |
| 粉尘 / 潮气敏感度 | 低 | 较高 – 感应面脏污可能误触发 |
| 典型用途 | 金属件到位 / 滑台位置检测 | 液位、非金属件到位、堵料检测 |
| 外壳 / 接线 | M18 螺纹桶身、IP 防护、M12 插头 | M30 螺纹桶身、IP 防护、M12 插头 |
实际工程中的选型规则
- Metal target within 8 mm? Inductive, every time – it ignores dust, chips and coolant that would false-trigger a capacitive head.
- Plastic, liquid or granular target? Capacitive, and mount it so the face can be wiped or blown clean; sensitivity is adjusted on the body.
- Wiring both types: keep the run to the M12 waterproof connector short and use a properly rated waterproof connector – most field failures traced to “bad sensors” are actually connector entries that were never sealed.
- Range derating: capacitive sensing distance drops with the dielectric constant of the target; apply the nominal 15 mm only to water-like media, and test-set the switch point on the real product.
Both models and the full range of industrial automation components are listed with dimensions and electrical data on the product pages.
常见问题
电容式能检测金属吗？
能，但会失去电感式对脏污的免疫力，而且动作点随目标变化。目标是金属时，电感式永远是更干净的选择。
KaiVoy 传感器的工作电压是多少？
Standard DC three-wire ranges used on automated lines – the exact rating and output type (PNP/NPN) is on each product page, and we confirm it against your PLC input cards when you send an enquiry.
供电缆型还是插头型？
行业里两种都有；上面链接的页面标注了 KaiVoy 型号的出厂配置，配套 M12 电缆线可以随传感器一并发货。