Light guard doors
Plastic and sheet-metal covers where a mechanical key would be over-specified.
Safety Interlock · Non-contact magnetic coding
QSD-M01 Non-Contact Magnetic Coding Safety Switch
A magnetic-coded interlock with two safety output contacts and a wide 8 mm operating / 17 mm release window — a low-cost coded alternative where a mechanical
Model QSD-M01-2A / 1A1B / 2B -02 · Brand LE Raun · Category: Safety Door Locks & Interlocks
Safety outputs2 × N.O.
Operating distance0–8 mm
Release distance>17 mm
ProtectionIP65 / IP67 / IP68
Overview
The QSD-M01 uses a magnetically coded target rather than an RFID tag. It is the simplest coded option: a reed-based pair with two safety output contacts, a 0–8 mm conduction distance and a release point beyond 17 mm — a wide window that tolerates doors which do not close to the same position twice.Three output configurations cover the usual wiring: two normally-open safety contacts, one of each, or two normally-closed. Sealing is IP65 as standard, with IP67 and IP68 available on request.
Application scenarios
Conveyor access gates
Monitors hinged gates on conveyors and sorters.
Enclosures and cabinets
Detects opening of electrical or process enclosures.
Retrofit guarding
Adds coded monitoring to a door that was previously unmonitored.
Low-cost multi-door machines
Several switches per machine at a lower unit cost than RFID.
Industries
- Logistics
- Packaging
- General machinery
- Food processing
Technical specifications
| Model | QSD-M01-2A (1A1B / 2B) -02 |
|---|---|
| Cable outlet | Direct cable outlet, 2 m |
| Output type | 2 N.O. contacts · 1 N.O. + 1 N.C. · 2 N.C. contacts |
| Safety output | Two normally-open safety output contacts (N.O.) |
| Operating distance | Conduction 0–8 mm, open >17 mm |
| Operating current | 30 mA |
| Output current | 100 mA |
| Response time | 60 ms |
| Operating frequency | 1 Hz |
| Operating temperature | −10 °C to +55 °C |
| Relative humidity | 5%–95% |
| Protection level | IP65 / IP67 / IP68 (custom) |
| Product application | Suitable for CNC machine tools, injection-moulding equipment, semiconductor manufacturing equipment, etc. It ensures that the machine does not perform hazardous movements when the safety guard door is opened. |
| Housing material | Flame-retardant thermoplastic (metal body on the high-performance series) |
| Contact material | Silver alloy |
| Contact resistance | ≤25 mΩ |
| Rated insulation voltage | 500 V |
| Rated impulse withstand | 4 kV |
| Utilisation category | AC-15 / DC-13 |
| Mechanical life | 1,000,000 operations |
| Electrical life | 500,000 operations |
| Ambient temperature | −25 … +80 °C, no icing |
Dimensions
| Item | Value |
|---|---|
| Magnet offset | 5 mm or 15 mm, chosen by which face of the switch the magnet approaches |
| Matching magnet | Φ13.5 × 8 × 8 mm, supplied with the switch |
| Cable | 2 m, direct outlet |
The 5 mm and 15 mm figures are the two switch-on distances the data sheet plots; mount at the smaller one where the door can slam, and at the larger one where paint or swarf builds up on the faces.
Wiring & output
| Terminal | Contact |
|---|---|
| 21 – 22 | NC, positive opening (second circuit) |
| 33 – 34 | NO |
| 41 – 42 | NO (where fitted) |
How to specify
- 01
Decide whether the guard must be locked
Monitoring only (mechanical interlock) is enough where the machine stops within the time the door needs to open. Locking is required where a spindle, press or robot arm keeps moving after the stop command.
- 02
Choose the coding
Mechanical actuation is the simplest and cheapest. RFID and magnetic coding resist defeat with a spare actuator, tolerate misalignment and are the usual choice on washdown or vibrating guards.
- 03
Pick the contact configuration
Count the circuits: two NC for a dual-channel safety input, one NO for the door-closed signal to the PLC, plus one more NO if the lock state has to be reported separately.
- 04
Check the holding force against the door
Fzh is the force the lock withstands before the guard can be pulled open. Large sliding guards and guards with a long lever need the 2,000 N class rather than the 1,300 N class.
- 05
Allow for the actuator radius
The actuator swings on the door hinge; the catalogue gives the minimum door radius for each model. Below that radius the actuator will bind and the switch will wear out.
Why this series
Wide 8 mm / 17 mm window
Conducts up to 8 mm and only releases beyond 17 mm, so a rattling door does not cause nuisance stops.
Three contact configurations
2 N.O., 1 N.O. + 1 N.C. or 2 N.C. to match the safety circuit.
No actuator to bend
A magnetic target has no lever arm to knock out of alignment.
Questions
Magnetic or RFID — which should I choose?
Magnetic coding is cheaper and has a wider operating window; RFID is harder to defeat and tolerates washdown better. Both are non-contact.
What are the safety outputs?
Two safety output contacts, normally open (N.O.), with 1A1B and 2B variants available for different circuit arrangements.
What is the release distance?
The output opens beyond 17 mm, giving a 9 mm hysteresis band over the 8 mm conduction point.
Need a quotation for QSD-M01 Non-Contact?
Send your application details or the guard opening dimensions and we will specify the right model and configuration for your machine.