Airtac DMSJ Electronic Sensor DMSJ-N020
The AirTAC Airtac DMSJ Electronic Sensor DMSJ-N020 is a genuine DMS magnetic position switch. It senses the magnet ring in a pneumatic cylinder's piston and signals when the piston reaches that point, giving a npn 3-wire output on 5-30 V DC with a 2 m flying lead. It only works on a cylinder that carries a piston magnet.
- TechnologyElectronic (solid-state)
- OutputNPN 3-wire
- Supply voltage5-30 V DC
- ProtectionIP64
- Profile (groove fit)J
- Lead / connector2 m flying lead
- VersionStandard
- RequiresMagnet-equipped cylinder
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac DMSJ Electronic Sensor DMSJ-N020
The DMSJ-N020 is the NPN (sinking) 3-wire version of AirTAC's electronic DMS switch family. It detects the piston magnet of a magnet-equipped AirTAC cylinder and delivers a clean, defined low-side switching signal rather than a series-connected contact. Because the 3-wire electronics need a dedicated supply, the voltage window is 5-30 V DC; the general housing is IP64. Wiring is a 2 m flying lead, read directly from the -020 code, and the J profile letter selects the groove fit for your cylinder body.
The key engineering fact: NPN means the switch sinks current to 0 V - it matches a sinking-input PLC card that expects an active-low signal. Getting NPN and PNP wrong is the most common integration error with these sensors, so check your input card type before ordering; the PNP equivalent is available in the same family. And as with every switch here, the cylinder must carry the built-in magnet option or the output never changes state.
Airtac DMSJ Electronic Sensor DMSJ-N020 Technical Specifications
| Model | Airtac DMSJ Electronic Sensor DMSJ-N020 |
|---|---|
| Family | DMS — Electronic cylinder switch |
| Technology | Electronic (solid-state) |
| Output | NPN 3-wire |
| Outputs in this family | 2-wire, NPN 3-wire or PNP 3-wire |
| Lead / connector | 2 m flying lead |
| Supply voltage | 5-30 V DC |
|---|---|
| Protection rating | IP64 |
| Version | Standard version |
| Profile letter | J (cylinder-groove fit) |
| Profiles in this family | E, G, H, J |
| Detects | Piston magnet ring inside the cylinder |
2-wire versions run 10-28 V DC; NPN / PNP 3-wire versions run 5-30 V DC. IP64 as standard. Order the RW version where coolant, washdown or constant cable flexing is present. Switching distance, response time, current rating, voltage drop, LED behaviour, contact life, weight and dimensions are not published in our data set — ask us and we will confirm from the factory datasheet.
Model Code: Airtac DMSJ Electronic Sensor DMSJ-N020
| DMS | Electronic cylinder switch — electronic (solid-state). |
|---|---|
| J | Profile letter: the mounting / groove type that fits a particular cylinder body. This family offers E, G, H, J. It is a fit code, not a performance grade. |
| N | Output: NPN 3-wire. Blank is 2-wire, N is NPN 3-wire, P is PNP 3-wire. |
| 020 | 2 m flying lead. 020 / 030 / 050 / 100 are 2 / 3 / 5 / 10 m flying leads; M08 and M12 are M8 / M12 connector versions. |
| (blank) | Standard version. |
We do not hold the full profile-to-cylinder-series table, so confirm the profile letter against your cylinder model before ordering — send us the cylinder part number and we will check the fit.
Which Family Do You Need?
- DMSElectronic, 2-wire / NPN / PNP, DC
- EMSMini electronic, 2-wire only, DC
- CMSReed contact, 2-wire, 5-240 V AC/DC
The split is electrical, not quality. Solid-state DMS and EMS are DC-only and suit modern PLC inputs; the reed-based CMS switches a much wider window, so it is the one for AC circuits, relay logic and older panels. The RW (IP68) option exists on DMS and EMS only.
| This switch | DMSJ · NPN 3-wire · 5-30 V DC |
|---|---|
| Consider EMS | the mini 2-wire electronic switch for tight installations |
| Consider CMS | the reed alternative for AC circuits and voltages up to 240 V |
| Mounting parts | F-MQ (round body), F-ACT (tie-rod) |
Where the Airtac DMSJ Electronic Sensor DMSJ-N020 Is Used
PLC input card integration
Machines with sinking-input DC cards take the NPN output directly into a discrete input module, giving a defined logic level without leakage-current workarounds.
Robotic gripper end-stroke feedback
A 6-axis robot's pneumatic gripper reports part-clamped status via the NPN signal, letting the cell controller advance the cycle only on a hard-verified grip.
Maintenance-friendly short runs
Local junction boxes mounted beside the machine frame keep cable runs short; the 2 m lead reaches them cleanly and keeps replacement swaps quick during planned maintenance.
Is the Airtac DMSJ Electronic Sensor DMSJ-N020 the Right Switch?
Go NPN when your PLC input card is the sinking type and expects the sensor to pull the input to 0 V; choose the PNP variant for sourcing cards common in European-style wiring. The 3-wire format gives a far cleaner on/off signal than a 2-wire switch, with no leakage current worrying the input's off-state. The 2 m lead suits short runs from cylinder to nearby junction box - for longer spans pick a 3/5/10 m lead or an M8/M12 connector version that lets you unplug for service. This is a DC-only solid-state switch; if your control voltage is AC, step across to the CMS reed family. Confirm the J groove against your cylinder's sensor channel and confirm the magnet option is on the cylinder.
Quick checklist
- ✓ Cylinder has a piston magnet
- ✓ Profile letter fits your cylinder groove
- ✓ Output matches the PLC input (NPN 3-wire)
- ✓ Supply rail is 5-30 V DC
- ✓ Lead length or M8 / M12 connector
- ✓ Coolant or flexing? Use the RW version
Installation & Wiring Notes
- check The cylinder must carry a piston magnet — a plain cylinder cannot be sensed.
- check Slide the switch along the groove to the stop position, then lock it.
- check Keep the supply within 5-30 V DC.
- check Wire npn 3-wire to match the PLC input's polarity.
- check Keep the lead clear of moving parts; use the RW type where it must flex.
- check Rated IP64 — protect it beyond that rating.
Use the F-MQ bracket on round-body cylinders and F-ACT on tie-rod cylinders where there is no groove to seat the switch. Both are ordered separately from the switch. Switching distance and mounting dimensions come from the factory datasheet — ask us for the sheet that matches your cylinder.
Airtac DMSJ Electronic Sensor DMSJ-N020 FAQ
Type: electronic (solid-state). Output: NPN 3-wire, sinking. Supply voltage: 5-30 V DC. Protection: IP64, general type. Wiring: 2 m flying lead. The J profile must match your cylinder's sensor groove, and the cylinder needs the built-in magnet option for any signal.
Match the switch to your PLC input card. NPN (this model) sinks current to 0 V and suits sinking inputs that expect an active-low signal - typical in Asian-style wiring. PNP sources +V and suits sourcing inputs common in European panels. The 3-wire design also gives a cleaner, leakage-free signal than a 2-wire switch. If you are unsure, tell us your input card model with the RFQ and we will confirm the right choice.
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Related AirTAC Cylinder Sensors
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Send us the quantity, your cylinder model (so we can confirm the profile fit) and the destination. We confirm price, availability and lead time — usually within 7-8 hours.