Airtac CMSG Reed Switch Sensor CMSG-020
The AirTAC Airtac CMSG Reed Switch Sensor CMSG-020 is a genuine CMS magnetic position switch. It senses the magnet ring in a pneumatic cylinder's piston and signals when the piston reaches that point, giving a 2-wire output on 5-240 V AC/DC with a 2 m flying lead. It only works on a cylinder that carries a piston magnet.
- TechnologyReed (magnetic contact)
- Output2-wire
- Supply voltage5-240 V AC/DC
- ProtectionIP64
- Profile (groove fit)G
- Lead / connector2 m flying lead
- VersionStandard
- RequiresMagnet-equipped cylinder
About the Airtac CMSG Reed Switch Sensor CMSG-020
The CMSG-020 is a reed position switch with a plain 2 m flying lead. Its magnetic reed contact closes when the piston magnet of an AirTAC cylinder sweeps past the body, giving a 2-wire circuit that handles 5-240 V AC/DC in an IP64 general housing. Profile G is the fit code that has to match the cylinder's sensor groove.
Two-wire reed wiring behaves like a mechanical limit switch: it sits in series with the load, which keeps the panel work simple but leaves a small leakage current through the circuit. The bare lead can be trimmed exactly to route length, avoiding coiled surplus cable in the trough. Being a mechanical contact it is AC/DC tolerant yet finite in life, so for millions of fast cycles weigh it against a solid-state DMS. Confirm that profile G suits your groove, and fit it only to a cylinder ordered with the magnet option.
Airtac CMSG Reed Switch Sensor CMSG-020 Technical Specifications
| Model | Airtac CMSG Reed Switch Sensor CMSG-020 |
|---|---|
| Family | CMS — Reed switch cylinder sensor |
| Technology | Reed (magnetic contact) |
| Output | 2-wire |
| Outputs in this family | 2-wire contact |
| Lead / connector | 2 m flying lead |
| Supply voltage | 5-240 V AC/DC |
|---|---|
| Protection rating | IP64 |
| Version | Standard version |
| Profile letter | G (cylinder-groove fit) |
| Profiles in this family | E, G, H, J |
| Detects | Piston magnet ring inside the cylinder |
A reed contact switches a wide window, 5-240 V AC or DC, which is why it suits AC circuits and relay logic. IP64. The CMS range has no RW / IP68 option - that belongs to DMS and EMS. 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 CMSG Reed Switch Sensor CMSG-020
| CMS | Reed switch cylinder sensor — reed (magnetic contact). |
|---|---|
| G | 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. |
| 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. On a CMS the suffix -H is the high-temperature version — do not confuse it with the H profile letter. |
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 | CMSG · 2-wire · 5-240 V AC/DC |
|---|---|
| Consider DMS | the solid-state range with NPN / PNP 3-wire outputs (DC only) |
| Consider EMS | the mini 2-wire solid-state switch (DC only) |
| Mounting parts | F-MQ (round body), F-ACT (tie-rod) |
Where the Airtac CMSG Reed Switch Sensor CMSG-020 Is Used
Test rig actuator
Stroke-end detection on a laboratory test bench cylinder, hard-wired to a data-logger's contact input.
Assembly stopper gate
Confirms the stopper cylinder is fully up before pallets are released onto the next assembly station.
Timing screw drive check
Verifies retract position on the timing-screw advance cylinder so product infeed cannot jam the pitch.
Is the Airtac CMSG Reed Switch Sensor CMSG-020 the Right Switch?
The 020 code is the economical route: cut the lead to length and terminate it yourself at the terminal rail or in a small junction box. If your circuit is AC or mixed-voltage, reed is the natural pick since the contact spans 5-240 V AC/DC with no polarity; DC-only panels with PLC inputs may prefer a DMS 3-wire NPN or PNP model instead. Longer leads (030/050/100) and M8/M12 connectors exist in the same family. Any choice still needs a magnet-equipped cylinder and a profile that seats in its groove.
Quick checklist
- ✓ Cylinder has a piston magnet
- ✓ Profile letter fits your cylinder groove
- ✓ Output matches the PLC input (2-wire)
- ✓ Supply rail is 5-240 V AC/DC
- ✓ Lead length or M8 / M12 connector
- ✓ High temperature? Use the -H 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 5-240 V AC/DC.
- check A reed contact suits AC or DC; observe the load limits on the datasheet.
- 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 CMSG Reed Switch Sensor CMSG-020 FAQ
Reed (magnetic reed) switch with a mechanical contact. Output 2-wire, supply voltage 5-240 V AC/DC, protection IP64, wiring a 2 m flying lead. The G in the code is the groove-fit profile, not a performance grade - match it to the cylinder.
A reed contact is mechanical: it works on AC or DC over 5-240 V with no polarity, but the contact has a finite life and can bounce. DMS and EMS switches are solid-state, DC-only (10-28 V for 2-wire types), with no bounce and faster cycling - and only 3-wire DMS versions offer NPN or PNP outputs for PLC inputs.
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Related AirTAC Cylinder Sensors
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