| Detection method | Through beam |
| Model | NPN | PU-U28 |
| PNP | PU-U28P |
| Output mode | Light-ON+Dark-ON |
| Sensing distance | 5mm（Slot width） |
| Standard target | Opaque object of 1.2 × 0.8 mm or larger |
| Light source | Infrared emission at 940 nm |
| Differential | <0.05mm |
| Repeat accuracy | <0.01mm |
| Supply power | 5–24 V DC ±10% or less |
| Residual voltage | 1 V or less (when the load current ≤ 50 mA) |
| Current consumption | <15mA |
| Load Current | ≤50mA |
| Circuit protection | Reverse polarity connection、Short circuit protection、Overload protection |
| Response Frequency | ≥1kHz |
| Indicator light | Action indicator light | Orange LED |
| Connection | Cable 2m |
| Ambient temperature | Work：-25～+55℃；Storage：-30～+80℃，No dew condensation or icing allowed |
| Ambient humidity | Work：5～85%RH，Storage：5～95%RH，No dew condensation |
| Ambient illumination | Sunlight：10,000Lx Lamplight：3,000Lx |
| Anti-vibration | 10~55Hz double-amplitude 1.5mmX,Y,Z 2h |
| Withstand voltage | 1000VAC,50/60Hz 1min between current-caring parts and case |
| Insulation resistance | ≥ 20 MΩ (500 VDC, terminals to housings) |
| Impact resistance | 500 m/s² (X, Y, Z directions, 3 times) |
| Protection degree | IEC IP64 |
| Material | Housing | PBT |
| Display cover | PC |