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SICK · Photoelectric sensor
WL121-3P1731 is a SICK photoelectric sensor with Output type (PNP/NPN) PNP/NPN (depending on type); Supply voltage 10...30 V DC (IEC 60947-5-2); Enclosure rating IP67 (IEC 60529). It is used in conveyor object detection, machine guarding, position feedback where the installed unit is matched to the original catalog number and a compact, documented part is required.
| Electrical | |
| Supply voltage | 10...30 V DC (IEC 60947-5-2) |
|---|---|
| Output current | 100 mA |
| Power consumption | ≤ 15 mA ... ≤ 25 mA |
| I/O and communication | |
| Response time | <= 1000 Hz switching frequency |
| Output type (PNP/NPN) | PNP/NPN (depending on type) |
| Mechanical | |
| Dimensions (H x W x D) | 15.6 mm x 48.5 mm x 42 mm |
| Enclosure rating | IP67 (IEC 60529) |
| Environment and compliance | |
| Operating temperature | -25...+70 °C (IEC 60068-2-1) |
| Certifications | CE, cULus |
Values follow the SICK Photoelectric sensor specification for this catalog number; parameters not confirmed for this variant are omitted rather than estimated.
| SICK Photoelectric sensor variants | |||
| Catalog number | Output type (PNP/NPN) | Supply voltage | |
|---|---|---|---|
| WL121-3P1731 (this page) | PNP/NPN (depending on type) | 10...30 V DC (IEC 60947-5-2) | |
| WL12-2N120 | PNP | 10...30 V DC (IEC 60947-5-2) | |
| WL100-2N3439 | — | DC 10 V ... 30 V | |
| WL100-2P1409S31 | — | DC 10 V ... 30 V | |
Before selecting an alternative, confirm its dimensions, terminals and installation requirements in the manufacturer documentation.
The WL121-3P1731 is the device-level element in a SICK photoelectric sensor installation. It receives the field signals and control supply listed above — 10...30 V DC (IEC 60947-5-2) — and switches or conditions the load within the the rated ratings shown in the Specifications table. Wiring and protective devices are sized to those same numbers, not to a generic assumption.
Typical installations place it in conveyor object detection, machine guarding, position feedback, where the unit is matched to the original catalog number and the enclosure provides standard panel or DIN-rail support. Record the catalog number and revision from the nameplate of the installed unit before specifying a like-for-like spare.
SICK WL121-3P1731 — Sensor or detector for object detection, distance measurement and status feedback on production lines. The figures below are taken from the specification table on this page for catalog number WL121-3P1731; size the surrounding wiring and upstream protection to these published ratings rather than to a generic assumption.
For a discontinued unit, match function and electrical ratings rather than the label alone.
Q.Before ordering WL121-3P1731, which operating temperature entry should be checked?
The operating temperature entry quoted above is -25...+70 °C (IEC 60068-2-1). Compare it with the nameplate of the installed unit before ordering.
Q.Where can I find the certifications data for WL121-3P1731?
It is listed in the specification table for SICK WL121-3P1731 as CE, cULus. Confirm this figure against the unit currently in the panel.
Q.For WL121-3P1731, what does the specification table state about dimensions (H x W x D)?
The specification table lists dimensions (H x W x D) = 15.6 mm x 48.5 mm x 42 mm for SICK WL121-3P1731. Use the value as the reference when sourcing a current-production equivalent.
Q.Can the WL121-3P1731 replace the unit currently installed in my panel?
Compare catalog number WL121-3P1731 and the ratings above with the nameplate of the installed device. A current-production equivalent is selected by function and electrical rating, not by the label alone.
Q.How do I confirm compatibility of WL121-3P1731 before ordering?
Match the catalog number WL121-3P1731 and the specification values listed above against the installed unit, then confirm the firmware or hardware revision where a revision-sensitive part is involved.
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Every product is covered by a 12-month seller warranty provided by SHLY-PLC, effective from the date of delivery, against defects in materials and workmanship under normal use.
This warranty does not cover damage from misuse, improper installation, power surges, neglect, unauthorized repair, or normal wear and tear. See our Return Policy for warranty-claim instructions.
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