Leuze FT328.34P-M12 | Fork Sensor 30mm Gap, PNP NO/NC, M12
Leuze FT328.34P-M12 thru-beam fork photoelectric sensor. 30mm gap, 5µm resolution, PNP push-pull NO/NC, M12 4-pin, 10-30V DC, IP67, for label / part detection.
Product Overview
The Leuze FT328.34P-M12 (often listed as FT 328.34P-M12) is a thru-beam fork-type photoelectric sensor from the FT 328 series, designed for precise detection of small parts, labels, punches, or web edges in a fixed mechanical gap. It features a 30 mm fork opening (gap), PNP push-pull output (NO/NC selectable), and an M12 4-pin connector. The emitter and receiver are permanently aligned inside the U-shaped fork — no alignment or adjustment is required, making it ideal for high-speed registration mark and label detection on packaging lines.
Technical Specifications (Optical & Electrical)
| Parameter | Specification |
| Model / Order Code | FT328.34P-M12 (Leuze FT 328 Series) |
| Sensing Mode | Thru-Beam Fork (Fixed Emitter–Receiver Pair) |
| Fork Opening (Gap / Slot Height) | 30 mm |
| Fork Width (Detection Zone Depth) | ~42 mm (typical for FT328) |
| Light Source | Red LED (Visible, 660 nm) |
| Supply Voltage | 10 … 30 V DC |
| Output Type | PNP Push-Pull, Light/Dark Switchable (NO or NC) |
| Switching Current | ≤ 100 mA |
| Response Time | ≤ 30 µs (High-Speed Version — typical of FT328) |
| Resolution (Min. Object Size) | ~0.05 mm (wire / edge detection) / Label detection ≥ thickness detectable |
Technical Specifications (Mechanical & Environmental)
| Parameter | Specification |
| Housing Material | Anodized Aluminum / Zinc Die-Cast (Fork Arms), Plastic Endcaps |
| Mounting Holes | M4 or M5 clearance holes on rear/front face (per FT328 drawing) |
| Connection | M12, 4-pin Plug Connector (A-coded) |
| Protection Rating | IP67 (EN 60529) |
| Operating Temperature | -20 … +60 °C |
| Vibration / Shock Resistance | IEC 60068-2-6 / 2-27 |
| EMC / Standards | EN 60947-5-2, CE |
| Weight (Approx.) | 0.08 kg |
Key Features
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Pre-Aligned Fork Design: Emitter and receiver are factory-aligned — no field adjustment, no drift, no alignment drift over time.
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Ultra-Fast Response: Sub-100 µs switching enables detection of high-speed registration marks, perforations, or flying parts on fast packaging machinery.
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Compact 30mm Gap: Accommodates labels on backing paper, small parts, or wire passing through the slot — also usable for double-sheet detection in feeder stations.
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M12 Standard Interface: 4-pin A-coded connector matches common sensor cabling — simplifies spare parts and replacement.
Applications
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Label Detection: Sensing clear/opaque labels on a carrier web (transparent backing) by detecting the label's opacity difference from the liner.
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Registration Mark Reading: Detecting printed eye-mark or notch on film/web for cut-to-length or print-registration.
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Small Part Verification: Confirming a tiny component has dropped into a nest or passed through a chute.
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Double-Sheet Detection: Detecting if one or two sheets have been picked from a stack in feeder/collator machines.
Note: For NPN output of the same fork, see FT328.34N-M12. For larger gaps (50 mm, 80 mm, 120 mm) in the same FT series, see FT350 / FT380 families. The M12 connector requires a mating M12 cable (e.g., Leuze VK or generic A-coded M12).
