Airtac CMSH Reed Sensor CMSH-C12
The AirTAC Airtac CMSH Reed Sensor CMSH-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)H
- Lead / connectorSee datasheet
- VersionStandard
- RequiresMagnet-equipped cylinder
About the Airtac CMSH Reed Sensor CMSH-C12
AirTAC's CMSH-C12 is a magnetic reed switch that reports piston position on cylinders carrying the factory magnet option. The contact is 2-wire and the supply window is wide - 5-240 V AC/DC - so the same part serves relay logic and low-voltage DC controls alike. The C12 connection code is an undocumented factory variant; we will confirm its detail from the datasheet on request. Standard protection is IP64.
Inside is a mechanical reed, so there is no polarity and no driver electronics to damage - just a contact that closes when the magnet passes. The H profile letter sets which cylinder groove the switch seats in; it is a fit code only, and the correct letter depends on your cylinder body, so check before ordering.
Airtac CMSH Reed Sensor CMSH-C12 Technical Specifications
| Model | Airtac CMSH Reed Sensor CMSH-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 | H (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 CMSH Reed Sensor CMSH-C12
| CMS | Reed switch cylinder sensor — reed (magnetic contact). |
|---|---|
| H | 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 | CMSH · 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 CMSH Reed Sensor CMSH-C12 Is Used
CNC fixture clamp
Fixture cylinders on a machining centre signal clamped position to a DC input card; the reed contact switches straight into the existing 24 V DC loop.
Gate actuator
Sliding gate cylinders on a construction-materials handling rig confirm end positions to a 230 V AC relay panel.
Lab press rig
Compact test-rig cylinders report stroke endpoints where a simple dry contact is preferred over powered electronics.
Is the Airtac CMSH Reed Sensor CMSH-C12 the Right Switch?
Choose this model when you want simple reed behaviour - mechanical contact, AC or DC, 5-240 V, no NPN/PNP decision - and the C12 connection code matches what your machine already uses; we will clarify that code from the datasheet. For a cleaner PLC signal at DC, a DMS 3-wire NPN or PNP switch is the alternative. Whatever you pick, the profile must match the cylinder groove and the cylinder must have the magnet option.
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 CMSH Reed Sensor CMSH-C12 FAQ
It is a reed switch with a 2-wire contact, rated for 5-240 V AC/DC, IP64 protected. Its wiring position carries the C12 connection code - a factory variant we will clarify from the datasheet. It only works on a cylinder with the built-in magnet.
Not here - in this code the H sits in the profile position, so it selects the groove fit for your cylinder, and the right letter depends on the cylinder series. A dedicated high-temperature CMS version exists under the separate H special code; ask us if your application runs hot.
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Related AirTAC Cylinder Sensors
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