ALJ12-4 Inductive Proximity Sensor
M12 threaded non-flush inductive proximity switch with a 4 mm +/-10% detection range, full NPN/PNP/two-wire output matrix and IP67 nickel-plated brass housing.
Key Features
- M12 x 1 thread, non-flush (unshielded)
- 4 mm detection range with +/-10% tolerance
- Full output matrix: NPN / PNP / two-wire; NO, NC, NO+NC
- DC 12-24 V or AC 110-220 V supply options
- IP67 nickel-plated brass housing with ABS face
- 2 m cable as standard
Technical Specifications
| Parameter | Value |
|---|---|
| Thread | M12 x 1, non-flush (unshielded) |
| Detection range | 4 mm +/-10% |
| Standard target | SPCC iron 12 x 12 x 1 mm |
| Setting distance | 0-4.4 mm |
| Supply voltage | DC 12-24 V (6-36 V) / AC 110-220 V (90-250 V) |
| Output | NPN / PNP / two-wire; NO, NC, NO+NC; <=200 mA |
| Response frequency | DC 0.8 kHz / AC 50 Hz |
| Housing / cable | Nickel-plated brass, ABS face; 2 m cable |
Where the ALJ12-4 Fits
The ALJ12-4 is an M12 threaded, non-flush (unshielded) inductive proximity switch rated at 4 mm +/-10% against a standard SPCC iron plate of 12 x 12 x 1 mm. The housing is nickel-plated brass with an ABS sensing face, sealed to IP67, with a 2 m cable.
Non-flush mounting buys range: shielded types of the same size class sit at shorter flush distances in this catalog, while the unshielded head needs free space around it and catalog-recommended spacing from adjacent sensors to avoid mutual interference.
It detects magnetic metal; the detection distance decreases on non-magnetic targets, which is the catalog's standing rule for inductive sensing rather than a limitation of this model alone.
Detection and Electrical Performance
Detection behavior: setting distance 0-4.4 mm, differential travel at or below 10% of the detection range, and a response frequency of 0.8 kHz on DC types or 50 Hz on AC types - fast enough for high-cycle machine positions on a packaging or assembly line.
Electrical fit: DC types run 12-24 V nominal (6-36 V absolute, ripple p-p 10% or less); AC types run 110-220 V (90-250 V, 50/60 Hz). Consumption stays at 13 mA or less on three-wire types and 0.8 mA on two-wire DC, and control output is up to 200 mA across the matrix.
Protection and environment: reverse-connection protection, surge absorption and load short-circuit protection on the N/P/D types, 1000 V AC 1-minute withstand between live parts and housing, and 50 megohm or better insulation. Rated for -30 to +65 °C at 35-95% RH.
Variants and Ordering
One housing, one full output matrix: DC NPN in NO, NC and NO+NC as ALJ12A3-4-Z/N1, /N2 and /N3; PNP equivalents as /P1, /P2 and /P3; two-wire DC as /D1 and /D2; AC two-wire as ALJ12A3-4-J/A1 and /A2.
Buyer tip: the housing and detection specifications stay identical across the matrix, so the decision that matters is electrical - NPN or PNP to match your PLC input card, the contact state your logic expects, and DC or AC supply. Confirm those three and the part number follows.
Send your target material, mounting space and supply voltage via WhatsApp at +86 186 5776 0640 or email joan@zm-ele.com, and we will confirm the exact ALJ12-4 variant before you order.
Related Products
ASN04 Inductive Proximity Sensor
Square 18 x 18 x 36 mm non-flush inductive proximity switch with a 5 mm +/-10% detection range, DC 1 kHz response and a full NPN/PNP/two-wire output matrix in IP67.