Airtac CMSH Reed Sensor CMSH-020-H
The AirTAC Airtac CMSH Reed Sensor CMSH-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)H
- 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 CMSH Reed Sensor CMSH-020-H
The CMSH-020-H is the high-temperature version of the H-profile reed switch. Its 2-wire mechanical reed contact reads the piston magnet of a magnet-equipped AirTAC cylinder, runs on a broad 5-240 V AC/DC supply with no polarity, and the enclosure rating remains IP64. Wiring is a 2 m flying lead you route and trim to suit the machine.
Two H letters appear in this code and they mean different things: the first sets the groove-fit profile, while the trailing -H marks the high-temperature construction intended for hot zones - think oven lines, hot presses or areas near curing ovens where a standard switch's materials would suffer. Still, this is a reed contact with a finite life; if your duty involves relentless high-rate cycling in the heat, discuss an electronic alternative with us. Verify the H profile against your cylinder's sensor groove before ordering.
Airtac CMSH Reed Sensor CMSH-020-H Technical Specifications
| Model | Airtac CMSH Reed Sensor CMSH-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 | 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-H
| 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. |
| 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 | 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-H Is Used
Bakery oven door
Prove the door cylinder of a tunnel oven is fully retracted before the conveyor advances, with the switch mounted close to the hot enclosure.
Plywood hot press
Detect full closure of the press cylinders on a veneer hot press, where radiant heat rules out a general-type sensor body.
Curing oven clamp check
Confirm part clamping inside a composites curing line, keeping the -H switch in the elevated-temperature zone while the panel wiring stays cool.
Is the Airtac CMSH Reed Sensor CMSH-020-H the Right Switch?
Reach for the -H suffix only when ambient or radiant heat would attack a general-type switch; elsewhere the plain CMSH-020 does the same electrical job for less. The reed format still suits AC circuits and series-wired loads, while PLC-driven, high-frequency duties belong with electronic DMS/EMS switches - and only their -RW variants achieve IP68 for washdown. Heat, washdown and cycling are three different problems with three different answers; tell us which you face. As always, the cylinder needs the magnet option and the profile must seat 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 CMSH Reed Sensor CMSH-020-H FAQ
Electrically it matches the standard model: reed contact type, 2-wire output, 5-240 V AC/DC supply, IP64 protection and a 2 m flying lead. The -H suffix changes the construction to the high-temperature version for hot zones, not the electrical format. Exact temperature limits are not in our data - confirm them from the datasheet.
No. High temperature and waterproofing are separate options in the AirTAC range. Only DMS and EMS switches carrying the -RW suffix reach IP68 with oil- and flex-resistant construction; every CMS, including this -H unit, stays at IP64. For combined heat and washdown, contact us to discuss a suitable pairing.
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Standard models are processed and dispatched in 3-5 business days.
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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.