Airtac CMSG Reed Switch Sensor CMSG-C12
The AirTAC Airtac CMSG Reed Switch Sensor CMSG-C12 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. 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 / connectorSee datasheet
- VersionStandard
- RequiresMagnet-equipped cylinder
About the Airtac CMSG Reed Switch Sensor CMSG-C12
The CMSG-C12 belongs to AirTAC's CMS family of reed position switches. Its sensing element is a mechanical reed contact, not a solid-state chip, so it closes like an ordinary switch and has no polarity to observe. Clipped into the sensor groove of an AirTAC cylinder fitted with the magnet option, it signals when the piston reaches that point. The G profile defines how the body seats in the groove, the C12 token is a connection code we will confirm from the datasheet on request, the supply range is a wide 5-240 V AC/DC, and the housing carries IP64.
Being a physical contact, this reed tolerates AC and DC circuits alike with either wire orientation - a flexibility no 3-wire electronic sensor offers. The trade-offs are a finite contact life and possible bounce at very rapid cycling, where a solid-state DMS unit may last longer. Before ordering, verify that the G profile matches the groove of your cylinder series; the letter is a fit code only, not a performance grade.
Airtac CMSG Reed Switch Sensor CMSG-C12 Technical Specifications
| Model | Airtac CMSG Reed Switch Sensor CMSG-C12 |
|---|---|
| Family | CMS — Reed switch cylinder sensor |
| Technology | Reed (magnetic contact) |
| Output | 2-wire |
| Outputs in this family | 2-wire contact |
| Lead / connector | See datasheet |
| 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-C12
| 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. |
| 12 | See datasheet. 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-C12 Is Used
Relay ladder retrofit
Wire the 2-wire contact in series with a relay coil on an older packaging machine panel; the contact accepts AC or DC coil circuits anywhere in the 5-240 V span.
Pallet stop confirmation
Clip the G-profile body into the stop-station cylinder groove so the control system knows the piston - and the pallet - has truly arrived.
Fixture clamp feedback
On a machining-cell jig, prove that each clamp cylinder is fully extended before the spindle cycle is allowed to start.
Is the Airtac CMSG Reed Switch Sensor CMSG-C12 the Right Switch?
Pick a reed switch like the CMSG-C12 when your circuit runs on AC, mixes AC and DC, or simply needs a contact wired in series with a load - no polarity, no input-card type to match. If you need solid-state speed and bounce-free signalling instead, look at the electronic DMS or EMS ranges, which are DC only. The C12 connection code is a factory variant we will verify from the datasheet rather than guess; never assume it equals an M8 or M12 connector. Remember that the switch reads nothing on its own - the cylinder must be ordered with the built-in magnet, and the G profile must seat correctly 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-C12 FAQ
It is a reed (mechanical contact) switch with a 2-wire output. Supply voltage covers 5-240 V AC/DC, protection is IP64, and the connection is coded C12 - a variant we confirm from the datasheet rather than guess. Figures such as maximum contact current are not published here; ask us for the datasheet.
No. Our catalogue documents M8 and M12 connectors separately, but C12 is its own connection code whose meaning is not listed in the data we hold. We will confirm exactly what it specifies from the datasheet on request before you commit to the order.
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