Airtac CMSJ Reed-type Sensor CMSJ-020-H
The AirTAC Airtac CMSJ Reed-type Sensor CMSJ-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)J
- 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 CMSJ Reed-type Sensor CMSJ-020-H
The CMSJ-020-H is a high-temperature magnetic reed position switch from AirTAC. Inside is a mechanical reed contact, not a solid-state circuit: it closes when the piston magnet of a suitably equipped AirTAC cylinder passes the body. Output is a simple 2-wire, non-polar contact running on 5-240 V AC or DC, with a 2 m flying lead and IP64 general protection.
The H code is what sets this unit apart - it is the CMS high-temperature build, intended for hot zones where a standard reed switch would not hold up. The reed contact also gives you AC or DC freedom with no polarity to worry about, something an electronic DMS or EMS switch cannot offer. The J in the code selects the mounting profile; match it to your cylinder's sensor groove before ordering, and remember the cylinder itself must carry the magnet option or the switch will never signal.
Airtac CMSJ Reed-type Sensor CMSJ-020-H Technical Specifications
| Model | Airtac CMSJ Reed-type Sensor CMSJ-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 | 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-020-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. |
| 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 | 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-020-H Is Used
Curing oven clamp
End-of-stroke confirmation on a clamping cylinder mounted beside a curing oven, where ambient heat rules out a general-type switch and the 2 m lead reaches a local junction box.
Glass bottle handling
Piston detection on the pusher cylinder of a glass bottle line, using the wide 5-240 V AC/DC contact to feed an existing relay circuit without supply changes.
Hot stamping press
Position signal from the part-eject cylinder of a hot stamping press; the reed contact closes a PLC input card directly and the non-polar 2-wire hookup keeps wiring errors out.
Is the Airtac CMSJ Reed-type Sensor CMSJ-020-H the Right Switch?
Pick a CMS reed switch when your control circuit is simple, your supply could be AC or DC, and you want a passive contact that behaves like a mechanical limit switch. Choose this -H variant if the mounting point sits in a hot area such as an oven line or near a press platen; confirm the exact temperature rating from the datasheet. The 2 m flying lead suits short runs where you can cut or terminate on site; step up to 030/050 or an M8/M12 connector if you need more reach or quick disconnects. In every case the J profile must seat correctly in the cylinder groove, and the cylinder must be ordered with the built-in magnet.
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-020-H FAQ
It is a CMS reed switch with a mechanical 2-wire contact. Supply range is 5-240 V AC or DC with no polarity, protection is IP64 for the general body, and the wiring is a 2 m flying lead. The H suffix marks the high-temperature version; its exact thermal limit is on the datasheet.
The CMS reed contact is mechanical: it works on AC or DC, ignores polarity, and has a finite contact life with possible bounce. A DMS switch is solid-state, DC-only, bounces less and cycles faster, but its voltage and polarity must match the circuit. Pick by what your input needs.
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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.