Airtac CMSE Magnetic Reed Sensor CMSE-020
The AirTAC Airtac CMSE Magnetic Reed Sensor CMSE-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)E
- Lead / connector2 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 CMSE Magnetic Reed Sensor CMSE-020
The CMSE-020 is an AirTAC CMS-series magnetic reed switch that detects the piston of a magnet-equipped cylinder. The contact is a sealed mechanical reed: it closes the moment the magnet passes and opens again as the piston retreats. This general-type version connects through a 2 m flying lead, accepts 5-240 V AC or DC, and the housing is sealed to IP64.
A reed contact carries no polarity, so it drops into an AC or DC circuit exactly like a mechanical limit switch - handy where a solid-state sensor would need extra conditioning. Note that the E profile defines the groove fit on the cylinder body; check it against your cylinder series or ask us to confirm before you order.
Airtac CMSE Magnetic Reed Sensor CMSE-020 Technical Specifications
| Model | Airtac CMSE Magnetic Reed Sensor CMSE-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 | E (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 CMSE Magnetic Reed Sensor CMSE-020
| CMS | Reed switch cylinder sensor — reed (magnetic contact). |
|---|---|
| E | 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 | CMSE · 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 CMSE Magnetic Reed Sensor CMSE-020 Is Used
Case diverter confirmation
On a carton packaging line, the CMSE-020 clips onto the diverter cylinder and tells the PLC the blade has reached full throw before the next case is released.
Gripper closed check
A robot pick station uses this switch on the gripper cylinder; its 2 m lead lands on a local terminal strip mounted beside the arm.
Press feeder home position
Fitted to the roll-feed slide of a punch press, the reed contact signals home at every stroke so the feed length stays synchronised.
Is the Airtac CMSE Magnetic Reed Sensor CMSE-020 the Right Switch?
Choose the reed CMSE family when your circuit is AC, or when you want a polarity-free contact that behaves like a mechanical limit switch; pick a DMS or EMS electronic switch instead for DC-only PLC inputs that need fast, bounce-free signalling. This unit is the plain 2-wire, 2 m lead version. If the cable will run near moving parts or washdown spray, a DMS-RW or EMS-RW switch with IP68 protection is the sturdier pick. A magnet-equipped cylinder (the -S option) and the matching E groove profile are both required - confirm the pairing before ordering.
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 CMSE Magnetic Reed Sensor CMSE-020 FAQ
Type: magnetic reed switch with a 2-wire output. Supply: 5-240 V AC or DC, with no polarity on the contact. Protection: IP64 for the general-type housing. Wiring: a 2 m flying lead. For contact ratings such as maximum switching current, confirm from the datasheet.
You can, but the two behave differently. The CMSE reed contact is mechanical: it accepts AC or DC without polarity yet has a finite contact life and may bounce once per actuation. A DMS or EMS electronic switch is solid-state and DC-only (10-28 V on 2-wire types), giving clean, fast cycling into a PLC input. Choose by circuit type and cycling rate.
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Related AirTAC Cylinder Sensors
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