HYPSEN HFS03-60LAB-M84 Label Mark Sensor — 3 × 60 mm Fork Slot, Self-Teach, NPN + PNP, 12–24 VDC

A label mark sensor (also called a label gap sensor or fork sensor) is a photoelectric sensor that straddles the label web on a labelling machine and detects the change in translucency at each label edge, so the applicator knows exactly when one label ends and the next begins. The HYPSEN HFS03-60LAB-M84 is a metal-bodied fork sensor with a 3 mm × 60 mm slot and a self-teach function.

A fork-type photoelectric label sensor for labelling and packaging machines. The label web runs through the 3 mm slot; the sensor sees the change in translucency at each label edge and outputs a pulse, so the applicator knows exactly where one label ends and the next begins. It self-teaches: run a short length of web through, press teach, and it sets its own threshold — no potentiometer hunting when you change label stock. Light-on and dark-on are both selectable, and the same 4-pin M8 connector carries NPN and PNP outputs, so it drops into most existing controllers without rewiring the input card. The 60 mm slot depth clears wide webs, and the metal housing survives the knocks that plastic fork sensors do not.

What can you use it for?

• Label gap detection on rotary and linear self-adhesive labelling machines
• Registration mark detection on flow wrappers, bag makers and pouch fillers
• Backing-web presence and label-missing alarms on print-and-apply heads
• Retrofit replacement for worn GS61, FC-2110, SR21, WF2 and 6.2 series label sensors
• Web position sensing on small converting, slitting and rewinding machines

Who is it for?

Packaging machine builders, labelling line maintenance technicians and automation integrators who need a self-teaching label sensor that drops into an existing NPN or PNP input without rewiring.

Compatibility

• Controllers: any PLC, motion controller or labelling-head board with a 12–24 V DC sinking (NPN) or sourcing (PNP) digital input
• Labels: self-adhesive paper and film labels, including semi-transparent stock, on a backing web
• Electrical: 12–24 V DC supply, 100 mA maximum load; both NPN and PNP outputs are present on the same 4-pin M8 connector
• Replaces: GS61, 6.2, FC-2110, SR21 and WF2 label sensors of the same fork format

Specifications

What's in the box

• Sensor + 2 m M8 cable (set): 1 × HFS03-60LAB-M84 fork sensor, 1 × 2 m M8 4-pin cable

Shipping and returns

Ships from our warehouse in Singapore with tracking. Parts and accessories: free standard shipping on orders over $25 ($4.99 below) to Canada, the UK, EU, Japan, Korea, Australia and most other countries, 5–15 days; to the United States at carrier cost from $27.99 (SingPost) or $109.99 (DHL Express). Assembled robot-arm kits over 2 kg are built and calibrated to order in Singapore (dispatch in 7–10 business days) and ship worldwide at carrier cost: SingPost Speedpost Priority from $124.99 (10–14 business days) or DHL Express from $229.99 (3–5 business days), shown at checkout. 7-day returns; defective items are replaced or refunded with shipping covered. Import duties, where charged by your country, are paid by the recipient.

Frequently asked questions

How does a label gap sensor work?

The label web runs through the fork slot. The emitter shines through the backing paper; where a label is present the web is less translucent, so the receiver sees less light. The sensor converts that step change into a digital pulse at each label edge, which the applicator uses to time label dispensing.

Do I need to adjust it when I change label stock?

No potentiometer hunting is needed. Run a short length of the new web through the slot and press the teach button; the sensor measures the label and gap levels and sets its own threshold.

Is the output NPN or PNP?

Both. Pin 4 (black) is the NPN output and pin 2 (white) is the PNP output, on the same 4-pin M8 connector. Use whichever matches your input card and leave the other unconnected.

Will it detect clear or semi-transparent labels?

Yes, semi-transparent labels are supported — this is the main reason to use a teach-in sensor rather than a fixed-threshold one. Fully clear labels on clear liner are the hardest case; teach on the actual stock and verify before running production.

What is the slot size?

The fork opening is 3 mm wide and 60 mm deep, so it clears webs up to 60 mm into the throat and tolerates the flutter of a 3 mm thick path.

What supply voltage does it need?

12–24 V DC, with a maximum switched load of 100 mA. Pin 1 (brown) is positive and pin 3 (blue) is negative.