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AirTAC DMS electronic cylinder sensor switch | NPN 3-wire · 1000 Hz · standard type IP64
This position switch mounts in the sensor groove of a pneumatic cylinder and senses the piston’s magnet ring: when the piston reaches the switch position, it sends a signal to the PLC to confirm the cylinder has reached its stroke. The AirTAC DMS series is electronic (contactless): it senses the magnetic field with electronic components and switches through a transistor output, with no mechanical contact, at up to 1000 Hz. In practice, switches on cylinders are often all called “reed switches”; strictly speaking, a reed switch has mechanical contacts, and AirTAC’s reed type is the CMS series (see the comparison below).
Models on this page (3, all DMS standard type)
| Model | Body profile | Output | Cable |
|---|---|---|---|
| DMSG-N020 | G type | NPN 3-wire | Direct cable 2 m |
| DMSG-N030 | G type | NPN 3-wire | Direct cable 3 m |
| DMSH-N030 | H type | NPN 3-wire | Direct cable 3 m |
How to read the part number (manufacturer ordering code): DMS = electronic; G, H = body profile, matching the sensor groove of different cylinders; N = NPN 3-wire; 020, 030 = cable length 2 m, 3 m; no RW suffix = standard type. PNP 3-wire, 2-wire, 5 m / 10 m cables, M8 / M12 quick connectors and the water-, oil- and flex-resistant RW type are available on request. Not sure whether you need G or H type? Tell us the cylinder model and we will check it for you.
Specifications (NPN 3-wire, per AirTAC manufacturer catalog)
| Item | DMS electronic (NPN 3-wire) |
|---|---|
| Operating voltage | DC 5–30 V |
| Max. switching current | 200 mA (30 V) |
| Max. contact capacity | 6.0 W |
| Internal current consumption | 5 mA or less |
| Internal residual voltage | 0.7 V or less |
| Max. switching frequency | 1000 Hz |
| Shock resistance | 30 G (manufacturer note: tested at a stricter 50 G) |
| Protection circuits | Reverse polarity protection, surge absorption |
| Operating temperature | −10 to 70°C |
| Protection class | Standard type IP64 (all 3 models on this page); RW type IP68 |
| Markings | CE, RoHS |
Specifications follow AirTAC’s CMS and DMS sensor catalogs; follow the manufacturer’s instructions for wiring and mounting.
DMS electronic vs. CMS reed type
| Item | DMS electronic (this page) | CMS reed type |
|---|---|---|
| How it switches | Electronic components sense the field; transistor output, no mechanical contact | Two reeds close when the magnet comes near; mechanical contact |
| Wiring | 3-wire (NPN or PNP); 2-wire also available | 2-wire |
| Voltage | DC 5–30 V (3-wire) | AC / DC 5–30 V |
| Max. switching frequency | 1000 Hz | 200 Hz |
| Watch out for | 3-wire needs a separate power lead; PLC input must match NPN or PNP | No separate power lead; high-temperature type (−10 to 125°C) available |
If you are replacing a 2-wire reed switch with a 3-wire electronic one, remember to connect the extra power lead and check whether the PLC input is wired for NPN or PNP sensors. AirTAC CMS reed switches are also available on request.
Key features
- Electronic, no mechanical contact: no reed contacts to wear or stick; up to 1000 Hz, for fast, frequently cycling cylinders.
- Protection circuits: reverse polarity protection and surge absorption.
- Cable and construction: the manufacturer catalog lists high-flex cable with an SR anti-flex structure at the cable exit, and an impact-resistant engineering plastic body.
- Four body profiles: G, H, E and J, matching different cylinder sensor grooves; DMSG can also use the manufacturer’s mounting accessories F-MQ□ and F-SC□SH (sold separately) to fit more cylinder types.
- RW type (water-, oil- and flex-resistant): about 20% more cable flexibility than the standard type, IP68, for oily or dusty environments, multi-axis robots and cable chains; the manufacturer recommends a minimum cable bending radius of 19 mm. The 3 models on this page are standard type; ask us for RW.
- CE, RoHS: marked CE and RoHS compliant.
Where it is used
- Confirming cylinder end-of-stroke
- Detecting gripper open / close position
- Fast cylinders with short cycle times
- With PLCs or controllers that have NPN inputs
- For oil mist, water spray or repeatedly flexed cables, choose the RW type
Related: SMC cylinder switches (reed and solid state) · SICK cylinder switches · KAISO proximity sensors · OMRON proximity sensors
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