Airtac CMSG Reed Switch Sensor CMSG-020-H
The AirTAC Airtac CMSG Reed Switch Sensor CMSG-020-H 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
- VersionH
- 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 CMSG Reed Switch Sensor CMSG-020-H
The CMSG-020-H is a reed-type magnetic position switch in the AirTAC CMS family. Inside is a mechanical reed contact that closes when the piston magnet of an AirTAC cylinder - fitted with the magnet option - passes the mounting point. It is a 2-wire switch that wires in series with your load like a plain contact, runs on 5-240 V AC or DC with no polarity to observe, carries a 2 m flying lead, and is rated IP64. The H suffix marks the high-temperature version, intended for positions near heat that a general-type switch should not sit in.
Because the contact is mechanical rather than solid-state, there is no leakage current to bleed into a PLC input, though a reed contact has a finite switching life and is best suited to lower duty cycles - confirm ratings from the datasheet. The G in the code is a fit code: it selects the body shape that seats into a matching cylinder sensor groove. Check it against your cylinder's groove before ordering, and remember the switch alone senses nothing - the cylinder must have a built-in piston magnet.
Airtac CMSG Reed Switch Sensor CMSG-020-H Technical Specifications
| Model | Airtac CMSG Reed Switch Sensor CMSG-020-H |
|---|---|
| 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 | High-temperature 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-H
| 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. |
| H | High-temperature 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-H Is Used
Bake-oven gate cylinders
Signals end-of-stroke on the gate cylinder of an industrial baking oven, where ambient heat around the carriage demands the high-temperature H construction.
Hot-stamping press
Confirms the clamp cylinder on a hot-stamping cell has reached the workpiece, feeding a 2-wire contact straight into the machine relay chain at line voltage.
Foundry ladle position
Monitors retraction of the tilt cylinder beside a foundry ladle, where radiant heat rules out a general-type sensor and AC control circuits are already in place.
Is the Airtac CMSG Reed Switch Sensor CMSG-020-H the Right Switch?
Choose CMS when the circuit runs on AC, runs on a very wide DC window, or simply calls for a passive contact that behaves like a mechanical limit switch. The 2-wire output drops into series wiring with almost no setup. This variant adds the H high-temperature construction - pick it over the general CMSG-030 or CMSG-050 when the switch will sit in a hot zone. If you are on a low-voltage DC PLC and want faster, bounce-free cycling, compare against the electronic DMS or EMS families instead. Flying lead keeps the install simple and cut-to-length; the profile letter must match the cylinder groove for the switch to seat correctly.
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-H FAQ
It is a reed (magnetic reed) position switch with a 2-wire contact output, supplied from 5-240 V AC or DC with no polarity, protected to IP64, and fitted with a 2 m flying lead. The H code denotes the high-temperature version of the general CMS type.
Only if the circuit suits a reed contact. The CMS is mechanical: it works on AC or DC across a very wide voltage span and leaks nothing in series wiring, but its contact has a finite life and can bounce. A DMS or EMS electronic switch is solid-state and DC only, better for fast PLC counting. Also confirm the G profile matches your cylinder groove and that the cylinder carries the piston magnet option.
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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.