Airtac CMSH Reed Sensor CMSH-020
The AirTAC Airtac CMSH Reed Sensor CMSH-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)H
- Lead / connector2 m flying lead
- VersionStandard
- RequiresMagnet-equipped cylinder
About the Airtac CMSH Reed Sensor CMSH-020
This CMSH-020 is a reed position switch: its output is a mechanical magnetic contact that behaves like a plain limit switch, wired 2-wire with no polarity. It reads the piston magnet of an AirTAC cylinder equipped with the magnet option and closes when the piston passes the groove where the unit sits. The H profile selects the groove fit, the 020 wiring is a 2 m flying lead, the supply range is 5-240 V AC/DC, and the housing is rated IP64.
Because the lead is unterminated for 2 metres, you can route it neatly through a cable duct and trim exactly what the run needs - shorter tails, no coiled surplus in the panel. A reed contact also carries no electronics, so it survives AC and DC supplies without any polarity discipline; the counterpoint is contact bounce and a finite mechanical life at extreme cycle counts. Check that the H profile matches the groove of your cylinder series before you order.
Airtac CMSH Reed Sensor CMSH-020 Technical Specifications
| Model | Airtac CMSH Reed Sensor CMSH-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 | 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-020
| 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. |
| 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 | 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-020 Is Used
Sorter divert gates
Detect full stroke of the divert-gate cylinders on a parcel sorter; trim the 2 m lead to reach the nearest terminal strip with no slack.
AGV lift mast position
Signal top-of-stroke on the lift mast cylinders of an automated guided vehicle so the navigation controller knows the load is raised.
Slide gate on a hopper
Confirm open and closed positions of a hopper slide-gate cylinder in a batching plant, wired in series straight into the AC control circuit.
Is the Airtac CMSH Reed Sensor CMSH-020 the Right Switch?
The real decisions with this family: reed (CMS) versus electronic (DMS/EMS) is a circuit question - AC or mixed supply and simple series wiring favour the reed, PLC inputs and high-speed cycling favour solid-state DC units. Among reed models, choose a 2 m lead like this one for cut-to-length economy, or an M8/M12 connector version when service access matters. Only DMS/EMS -RW switches reach IP68; a reed stays IP64. The cylinder must be magnet-equipped and the H profile must fit its groove - confirm the match with us.
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-020 FAQ
As a reed switch it accepts 5-240 V AC or DC with either wire polarity, its 2-wire contact drops into the circuit like a mechanical switch, and the general-type housing is IP64. The wiring is a 2 m flying lead, and the H profile is the groove-fit code. Contact ratings beyond this are not in our data - request the datasheet.
No. Here the H is the profile letter that sets how the body seats in the cylinder groove. The high-temperature version is written with a trailing -H, as in CMSH-020-H. Both letters sit in different positions of the ordering code and mean different things.
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Related AirTAC Cylinder Sensors
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