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| PartNumber | E3S-AT21 | E3S-AT21-D 2M | E3S-AT21-D2M |
| Description | Optical Sensors Photoelectric Sensors 7M SEP NPN W/ A LARM HOR | Optical Sensors Photoelectric Sensors Receiver Only for E3 S-AT21 | |
| Manufacturer | Omron Automation and Safety | Omron Automation and Safety | - |
| Product Category | Optical Sensors - Photoelectric, Industrial | Optical Sensors - Photoelectric, Industrial | - |
| Series | E3S-A | E3S-A | - |
| Height | 22.3 mm | - | - |
| Length | 44 mm | - | - |
| Width | 12.4 mm | - | - |
| Operating Temperature | -25°C ~ 55°C | -25°C ~ 55°C | - |
| Features | Light ON / Dark ON | - | - |
| Ingress Protection | NEMA 4X; IEC IP67 | NEMA 4X; IEC IP67 | - |
| Voltage Supply | 12 V ~ 24 V | 12 V ~ 24 V | - |
| Sensing Method | Through-Beam | Through-Beam | - |
| Output Configuration | NPN - Dark-ON/Light-ON - Selectable | NPN - Dark-ON/Light-ON - Selectable | - |
| Adjustment Type | Two-Turn Endless Adjuster with an Indicator | Two-Turn Endless Adjuster with an Indicator | - |
| Response Time | 0.5ms | 0.5ms | - |
| Sensing Distance | 275.591" (7m) | 275.591" (7m) | - |
| Connection Method | Cable | Cable | - |
| Cable Length | * | * | - |
| Light Source | Red (700nm) | Red (700nm) | - |
| Maximum Operating Temperature | + 55 C | - | - |
| Minimum Operating Temperature | - 25 C | - | - |
| Operating Supply Voltage | 24 V | - | - |