Airtac CMSJ Reed-type Sensor CMSJ-030
The AirTAC Airtac CMSJ Reed-type Sensor CMSJ-030 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 3 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 / connector3 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-030
AirTAC's CMSJ-030 is a magnetic reed position switch that reports piston position on an AirTAC cylinder fitted with the magnet option. The reed element is a sealed mechanical contact, so the unit draws nothing from the supply and simply closes or opens the 2-wire loop. Because it is a reed type, it accepts 5-240 V AC or DC without polarity concerns and carries IP64 general protection on its 3 m flying lead.
That 3 m lead is the practical difference from the 020 version - extra reach to a junction box or terminal rail without splicing. One characteristic worth knowing: a reed contact can bounce and has a finite mechanical life, unlike a solid-state DMS, so for very high cycling duty an electronic switch may serve better. The J profile letter defines the groove fit on the cylinder; verify it against your cylinder model, since an unmatched profile will not seat in the tie-rod or band slot.
Airtac CMSJ Reed-type Sensor CMSJ-030 Technical Specifications
| Model | Airtac CMSJ Reed-type Sensor CMSJ-030 |
|---|---|
| Family | CMS — Reed switch cylinder sensor |
| Technology | Reed (magnetic contact) |
| Output | 2-wire |
| Outputs in this family | 2-wire contact |
| Lead / connector | 3 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-030
| 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. |
| 030 | 3 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-030 Is Used
Carton reject gate
End-of-stroke sensing on the reject-gate cylinder of a carton packaging conveyor; the 3 m lead reaches a panel-mounted relay base without an extension.
Machine tool fixture
Clamp confirmation on a fixture cylinder of a milling machine, wired in series with an existing 24 V DC interlock loop like a conventional limit switch.
Pallet stopper
Advance signal from the stopper cylinder on a pallet conveyor in a distribution centre, using the AC/DC contact across mixed legacy control voltages.
Is the Airtac CMSJ Reed-type Sensor CMSJ-030 the Right Switch?
Choose the CMSJ-030 when you want a passive, polarity-free contact that drops into an existing AC or low-voltage DC circuit. It is a 2-wire series device, wired much like a mechanical limit switch, with small leakage current. If the run to your control cabinet is longer, the 5 m CMSJ-050 or an M8/M12 connector variant saves a splice; if the spot is hot, take the -H build instead. Confirm the J profile matches your cylinder's sensor groove, and order the cylinder with the -S magnet option - without the magnet the switch has nothing to read.
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-030 FAQ
Type: CMS magnetic reed switch with a mechanical 2-wire contact. Output: 2-wire, non-polar. Supply: 5-240 V AC or DC. Protection: IP64 general type. Wiring: 3 m flying lead. The contact acts like a passive switch in series with your load.
Only cylinders with the built-in magnet option can be detected, and the J profile must match that cylinder's sensor groove - the letter is a fit code, not a performance grade. Give us your cylinder series and we will confirm the right profile from the datasheet.
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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.