Airtac CMSJ Reed-type Sensor CMSJ-050
The AirTAC Airtac CMSJ Reed-type Sensor CMSJ-050 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
- 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 CMSJ Reed-type Sensor CMSJ-050
The CMSJ-050 is AirTAC's general-purpose magnetic reed switch with the longest standard flying lead in the 020/030/050 ladder. A sealed mechanical reed contact closes when the magnet built into an AirTAC cylinder's piston passes the switch body. The 2-wire output is non-polar and accepts 5-240 V AC or DC, so the same unit drops into relay logic, a 24 V DC PLC input, or an AC control circuit, with IP64 protection on the housing.
The 5 m lead is the working benefit: cylinders mounted far from the control cabinet, or on moving parts where a connector would be awkward, can be wired straight back without joints. Keep in mind the reed is a mechanical device - contact life is finite and slight bounce at closure is normal, which is why high-speed cycling often calls for a solid-state DMS instead. The J profile letter sets the groove fit; check it against your cylinder's sensor slot, and only a cylinder ordered with the magnet option will produce a signal.
Airtac CMSJ Reed-type Sensor CMSJ-050 Technical Specifications
| Model | Airtac CMSJ Reed-type Sensor CMSJ-050 |
|---|---|
| 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 | Standard 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
| 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. |
| (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 | 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 Is Used
High-bay lift table
Upper-limit detection on the lift cylinder of a high-bay lift table, with the 5 m lead running directly to a relay panel at floor level.
Welding cell clamp
Clamp-closed signal on a fixture cylinder inside a robotic welding cell, the long lead keeping the connection point outside the spatter zone.
Accumulation conveyor
Gate position feedback on a pop-up gate cylinder along an accumulation conveyor, wired into a 24 V DC PLC input as a simple series contact.
Is the Airtac CMSJ Reed-type Sensor CMSJ-050 the Right Switch?
Select the CMSJ-050 for passive reed sensing where the distance to your junction point makes 2 m or 3 m leads short. If you would rather unplug at service time, an M8 or M12 connector variant trades the fixed lead for a quick disconnect. Stay in the CMS family when the supply may be AC or DC and you want polarity-free wiring; move to a DMS NPN or PNP switch for clean, fast DC signalling into a PLC. As always, the J profile must match the cylinder groove, the cylinder needs the built-in magnet, and no stock or delivery terms apply until we quote.
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 FAQ
Yes. Family: CMS reed switch (mechanical contact). Output: 2-wire, non-polar. Supply: 5-240 V AC or DC. Protection: IP64 general type. Wiring: 5 m flying lead. Sensing distance and contact ratings are not stated here - confirm those from the datasheet.
A fixed 5 m flying lead is the economical choice when the cylinder sits far from the control point and the cable rarely changes. An M8 or M12 connector version costs more but lets maintenance staff unplug and swap the sensor quickly. It is a specification decision, not a delivery one.
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Standard models are processed and dispatched in 3-5 business days.
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Related AirTAC Cylinder Sensors
Request a Quote for Airtac CMSJ Reed-type Sensor CMSJ-050
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.