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Brand: SICK
SICK CLV631-2120 CLV63x Identification Sensor
Description
CLV631-2120 is a SICK CLV63x identification device (part no. 1041983) that reads codes or RFID tags so that products and containers can be tracked automatically. The catalogue summary lists: optical focus: Fixed focus; type: Rotary angle variant single port (12-pin); max. reading distance: 412 mm; code resolution: 0.25 mm … 0.5 mm; code printing process: Label (printed codes).
CLV631-2120: function, principle and typical use
Identification readers feed the control system with the identity of each item: a barcode or 2D code on a label, or an RFID transponder. Telegram format and filtering are configured in the SICK software.
RFID reads many tags in a field at once and does not need line of sight, which suits tote and pallet tracking. A trigger from a photoelectric sensor starts a read only when a product is present, saving bus traffic.
Technical specifications
| Parameter | Specification |
|---|---|
| Type code | CLV631-2120 |
| Part number | 1041983 |
| Product family | CLV63x |
| Version | Mid Range |
| Connection type | Ethernet |
| Reading field | Side (105°) |
| Sensor type | Line scanner |
| Optical focus | Fixed focus |
| Light source | Light spot, laser, Visible, Red, 655 nm |
| Light spot | Circular |
| Laser class | 2, complies with 21 CFR 1040.10 except for the conformance according to “Laser Notice No. 56” from May 8, 2019 (EN 60825-1:2014+A11:2021, IEC 60825-1:2014) |
| Aperture angle | ≤ 50° |
| Reading distance | 74 mm … 412 mm |
| Scanning frequency | 400 Hz … 1,200 Hz |
| Code resolution | 0.25 mm … 0.5 mm |
| Connection type (2) | 2 x M12 cylindrical connectors (12-pin male connector, 4-pin female connector) on swivel connector |
| Supply voltage | 18 V DC … 30 V DC |
| Power consumption | 5 W |
| Housing material | Aluminum die cast |
| Window material | Glass |
| Enclosure rating | IP65 (EN 60529) |
| Weight | 270 g, without connecting cable |
| Dimensions (L x W x H) | 80 mm x 96 mm x 38 mm |
| MTBF | 100,000 h |
| MTTF | 40,000 h (Laser diode) |
| Readable code structures | 1D codes |
| Bar code types | All current code types, Code 39, Code 128, Code 93, Codabar, GS1-128 / EAN 128, UPC / GTIN / EAN, Interleaved 2 of 5, Pharmacode, GS1 DataBar, Telepen, MSI/Plessey |
| Code printing process | Label (printed codes) |
| Print ratio | 2:1 … 3:1 |
| No. of codes per scan | 1 … 20 (Standard decoder); 1 … 6 (SMART decoder) |
| Declarations and certificates in the data sheet | EU declaration of conformity; UK declaration of conformity; ACMA declaration of conformity; China RoHS; cULus certificate; Ethercat certificate; Profinet certificate; Laser safety (IEC 60825-1) declaration of manufacturer; Information according to Art. 3 of Data Act (Regulation EU 2023/2854) |
Selection and installation notes for CLV631-2120
Electrically and for the interface, the listed values are frequency: 400 Hz … 1,200 Hz; interface: optional over external fieldbus module CDF600; supply: 18 V DC … 30 V DC; connection: Ethernet; resolution: 0.25 mm … 0.5 mm; power draw: 5 W.
Mechanical and environmental data for this type: shock EN 60068-2-27 (1993); dimensions 80 mm x 96 mm x 38 mm; operating temperature 0 °C … +40 °C; weight 270 g, without connecting cable; housing aluminum die cast; enclosure rating IP65 (EN 60529); vibration EN 60068-2-6 (1995); storage temperature –20 °C … +70 °C.
Check the variant for lens or reading-field options in the type code.
Keep the reader window and the code area clean; label quality is often the weakest link.
Documents and quotation
The official SICK data sheet for CLV631-2120 (part no. 1041983) is attached as a PDF. Quotations are prepared by Seven Star LLC, an independent supplier in Muscat, once you send the part number, quantity and site through the RFQ form. Browse more in Machine Vision. Compare the complete type code with your existing unit and controller before ordering; the data sheet prevails if it differs from this page.
Datasheets & Documents
- Data Sheet SICK CLV631-2120 official data sheet (part no. 1041983) Download
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About brand
SICK is the German maker of industrial sensors: photoelectric and proximity sensors, safety laser scanners and light curtains, encoders, distance sensors, code readers and gas analysers. Erwin Sick, an optics engineer, founded it in Munich in 1946, and in 1952 it introduced its first marketable accident-prevention light curtain, which protected press operators by stopping the machine when a hand broke the light beam. The company moved to Waldkirch in the Black Forest in 1956 and is still headquartered there. It is a privately held company, and has been an Aktiengesellschaft (AG) since 1996.
SICK company profile
| Founded | 1946, Munich, Germany, by Erwin Sick (1909–1988) |
|---|---|
| Headquarters | Waldkirch, Baden-Württemberg, Germany (since 1956) |
| Ownership | Privately held; after the founder's death in 1988 his widow Gisela Sick became the main shareholder. Legal form SICK AG since 1996 |
| Size | More than 12,000 employees and group revenue of about EUR 2.3 billion (company figures for 2023) |
| First breakthrough | Accident-prevention light curtain for presses, shown in Hanover in 1952 |
| International growth | First foreign subsidiary in France in 1972, United States in 1976; today sales and service companies worldwide |
| Product families | Photoelectric, inductive, capacitive, magnetic and ultrasonic sensors; safety laser scanners, light curtains, safety controllers and relays; encoders and motor feedback systems; distance sensors and LiDAR; barcode and 2D code readers and machine vision; gas analysers, dust and flow measurement for process and emissions monitoring |
Milestones
- 1946: Erwin Sick receives a licence to run his engineering firm in Munich.
- 1952: The first marketable accident-prevention light curtain is presented in Hanover and goes into series production.
- 1956: The company moves to Waldkirch with 25 employees.
- 1972 and 1976: Subsidiaries are founded in France and the United States.
- 1996: SICK becomes an Aktiengesellschaft.
- Today: Sensors for factory and logistics automation, machine safety and process analysis, with a large share of revenue outside Germany.
Choosing a SICK sensor
For object detection, the sensing principle comes first. A retro-reflective sensor (WL series) sends light to a reflector and switches when an object breaks the beam; it is reliable over long distances and easy to align. A sensor with background suppression (WTB series) detects an object at a set distance and ignores what is behind it, which suits conveyors with shiny or dark backgrounds. A through-beam pair (WS/WE) gives the longest range and the highest reliability in dust. For transparent bottles and film, use a model built for transparent objects (for example WL12G-3B or WL150-P420). The digits in the code also matter: "P" usually means a PNP output and "N" NPN, and the last digits set the connector or cable. For machine guarding, a safety laser scanner such as nanoScan3 or microScan3 protects an area, while a safety controller such as Flexi Soft combines several safety devices.
Where SICK products are used
In Oman and the GCC, SICK sensors are used in packaging and bottling lines, food and beverage plants, logistics and airport baggage handling, cement and steel plants, ports and cranes, automated warehouses, and on machines built by European OEMs. SICK safety scanners guard robots and automated guided vehicles, and its encoders give position feedback on motors, hoists and conveyors.
SICK products we list
| Family | Examples |
|---|---|
| Photoelectric sensors | WL12-3P2431, WTB12-3P2431, GTB6-P4211, VL18-4P3240, WL12G-3B2531, WS/WE100, KT5W contrast, W26 IO-Link |
| Proximity, cylinder and ultrasonic sensors | IME12-08NPSZC0S, IME18-05BPSZC0S, MZT8, UM18 4-20 mA, UM30, UFN3 fork |
| Machine safety | nanoScan3, microScan3, S300 Professional, Flexi Soft FX3-CPU1, FX3-XTIO, ReLy OSSD |
| Encoders and motor feedback | DFS60B, AFM60 PROFINET, AFS60 SSI, ATM60 PROFIBUS, SRS50, EFS50 |
| Distance sensors and code readers | DT50, DL50, DT35, Lector632 |
Ordering SICK products: what we need
Send the type code and the 7-digit SICK part number from the label (for example WTB12-3P2431 together with its part number). For a replacement sensor, add the output (PNP or NPN), connection (M8, M12 or cable) and sensing distance. For encoders, add the interface (incremental, SSI, PROFIBUS, PROFINET), resolution and shaft type. For safety scanners, tell us the model and whether the existing configuration needs to be kept.
Facts checked against SICK's published company history and annual figures, October 2026.
Browse SICK products by category: Sensors & Transmitters.
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Frequently Asked Questions
What is the SICK CLV631-2120?
It is a SICK identification sensor (CLV63x), part no. 1041983. The catalogue summary reads: Optical focus: Fixed focus; Type: Rotary angle variant single port (12-pin); Max. reading distance: 412 mm; Code resolution: 0.25 mm ... 0.5 mm.
What supply does the CLV631-2120 need?
Supply voltage is 18 V DC ... 30 V DC. Check the output and interface rows in the table for the signal levels.
What protection rating and temperature range are given?
Enclosure rating: IP65 (EN 60529). Ambient operating temperature: 0 °C ... +40 °C. Confirm both against the site before ordering.
Does the page include the data sheet?
Yes. The official SICK data sheet for part no. 1041983 is attached as a PDF and linked on this page; where it differs from the page text, the data sheet applies.
What should be confirmed before ordering the CLV631-2120?
Compare the full type code and part number 1041983 with the device being replaced, check supply, output or interface and mounting, and send the details through the RFQ form. Seven Star LLC is an independent supplier, not a SICK partner.
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