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
- 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 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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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.