Airtac CMSJ Reed-type Sensor CMSJ-050-H
The AirTAC Airtac CMSJ Reed-type Sensor CMSJ-050-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 5 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)J
- Lead / connector5 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 CMSJ Reed-type Sensor CMSJ-050-H
This is the CMSJ-050-H, a reed position switch in AirTAC's CMS family. Inside is a magnetic reed contact - a mechanical switch blade that closes when the piston magnet of a suitably equipped cylinder sweeps past. The J profile defines how the body seats in the cylinder's sensor groove, the -H suffix marks the high-temperature version, and 050 means a 5 m flying lead. As a 2-wire reed it runs on 5-240 V AC or DC and carries IP64 protection.
A reed contact has no polarity, so AC circuits wire it without any NPN/PNP thinking - one reason it stays popular on older panels. Contact life is finite and the contact can bounce, so check the switching current rating in the datasheet before sizing your load. Note that the J profile is a fit code: confirm it against your cylinder model, because a mismatched profile simply will not seat in the groove.
Airtac CMSJ Reed-type Sensor CMSJ-050-H Technical Specifications
| Model | Airtac CMSJ Reed-type Sensor CMSJ-050-H |
|---|---|
| Family | CMS — Reed switch cylinder sensor |
| Technology | Reed (magnetic contact) |
| Output | 2-wire |
| Outputs in this family | 2-wire contact |
| Lead / connector | 5 m flying lead |
| Supply voltage | 5-240 V AC/DC |
|---|---|
| Protection rating | IP64 |
| Version | High-temperature version |
| Profile letter | J (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 CMSJ Reed-type Sensor CMSJ-050-H
| CMS | Reed switch cylinder sensor — reed (magnetic contact). |
|---|---|
| J | 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. |
| 050 | 5 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 | CMSJ · 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 CMSJ Reed-type Sensor CMSJ-050-H Is Used
Paint curing oven
End-of-stroke proof for gate cylinders inside a curing oven, where the high-temperature -H build is specified for the hot zone.
Die-casting trim press
Ejection confirmation on trim cylinders working close to hot dies, with the 5 m lead running back to the press panel.
Tunnel pasteurizer line
Diverter-gate position feedback on a hot, wet bottle line, wired as a simple 2-wire contact into the existing AC control circuit.
Is the Airtac CMSJ Reed-type Sensor CMSJ-050-H the Right Switch?
Choose a CMS reed when the circuit is AC, or DC, and you want a plain contact wired in series with the load - no polarity to respect and no input card to match. If your PLC counts fast cycles, a solid-state DMS with NPN or PNP output is the better match. This 5 m lead reaches a remote panel comfortably, and the cut-and-strip ends keep wiring simple. The -H high-temperature option is what separates this model from the standard CMSJ for hot zones - washdown protection (the -RW IP68 grade) is a DMS/EMS option, not a CMS one. Your cylinder must carry the magnet option, and its groove must match the J profile.
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 CMSJ Reed-type Sensor CMSJ-050-H FAQ
It is a reed (mechanical contact) switch with a 2-wire output. Supply voltage is 5-240 V AC or DC with no polarity, protection is IP64, and the wiring is a 5 m flying lead. This is the high-temperature (-H) version; current and load limits are listed in the datasheet.
Any cylinder fitted with the piston magnet option whose sensor groove accepts the J profile. The switch reads only that magnet - without it there is nothing to detect. Send your cylinder model with the enquiry and we will confirm the groove fit from the datasheet.
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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.