Overview
The Banner QH23SN6LP-71792 is a polarized photoelectric sensor engineered for reliable object detection in industrial automation applications. As part of the QH23 series, this sensor combines proven retro-reflective detection technology with robust M8 connectivity and wide environmental tolerance for demanding manufacturing and logistics environments.
Key Features
- Retro-reflective detection mode — Beam reflects off target surface for reliable presence/absence sensing
- NPN transistor output — Complementary NO/NC digital outputs (Light-ON or Dark-ON selectable)
- Potentiometer adjustment — Field-tunable sensitivity for precise application matching
- IP67 / NEMA-rated housing — Sealed thermoplastic construction resists washdown and harsh environments
- Visible red light (680nm) — Easy alignment and troubleshooting without infrared equipment
- M8 4-pin connector — Pre-wired with 6-inch (150mm) pigtail for quick integration
Technical Specifications
Key performance parameters for system integration and selection:
| Detection Mode | Polarized Retro-reflective |
| Sensing Range | 10 cm to 2 m |
| Output Type | NPN Transistor, Complementary NO/NC |
| Light Wavelength | Visible Red (680 nm) |
| Connector | 4-pin M8 Pico-style, 6″ / 150 mm pigtail |
| Housing Material | Thermoplastic with Acrylic Lens |
| Shape | Rectangular |
| IP Rating / NEMA | IP67 / NEMA 1, 2, 3, 3S, 4, 4X, 6, 12, 13 |
| Operating Temperature | −20 °C to +55 °C |
| Series | Banner QH23 |
Typical Applications
- Manufacturing & Assembly — Part detection, positioning, and verification on production lines
- Logistics & Packaging — Box/carton detection, conveyor presence sensing, and bottleneck monitoring
- Machine Safety — Guard and gate interlocking, emergency stop verification
- Material Handling — Pallet and load detection, stacking height control
- Washdown Environments — IP67 rating enables use in wet/outdoor settings where standard sensors fail
Compatibility & Replacements
Compatible With
- PLC and controller discrete inputs (24 VDC, NPN-compatible interfaces)
- Industrial control relay modules
- Safety-rated logic controllers with NPN input cards
- Standard industrial wiring and panel-mount M8 receptacles
Replaces / Drop-In Replacement For
- QH23SN6LPQ — Equivalent standard model designation
- Other QH23-series polarized retro-reflective sensors with M8 connectivity
Works With
- 24 VDC industrial power supplies
- Standard NPN discrete input modules
- Complementary output relay logic (Light-ON, Dark-ON modes configurable via potentiometer)
- M8 connectors and junction boxes (4-pin Pico-style)
