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Datalogic

SR21-RG = Label sensor red/gre

SKU: 

953151080

SR21-RG = Label sensor red/green pnp/npn - M8
Description
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The Datalogic SR21 is a photoelectric slot sensor designed for automation engineers and machine builders working in packaging and labelling applications. Its 2 mm slot width and 12-bit (4096-step) resolution enable precise detection of labels, register marks, and semi-transparent materials at switching frequencies up to 25 kHz with a response time of 20 µs max. Two model variants address distinct tasks: the SR21-IR uses infrared 880 nm emission for label and hole detection on continuous surfaces, while the SR21-RG employs dual red/green emission for colour print register mark detection on transparent films. An IP65-rated ZAMA housing with glass lenses withstands demanding industrial environments, and the AUTO-SET push-button — supporting both static and dynamic configuration modes — simplifies commissioning on fast-moving production lines. Power supply accepts 10 … 30 Vdc with reverse polarity protection, and antivalent NPN and PNP outputs on separate pins provide flexible integration.
Documents
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Product document mod-sr21-datalogic-in-counter-readers-datasheet.pdf 953151080 Product document mod-sr21-datalogic-in-counter-readers-user-manual.pdf 953151080 Product document mod-sr21-datalogic-in-counter-readers-datasheet.pdf MOD-SR21 Product document mod-sr21-datalogic-in-counter-readers-user-manual.pdf MOD-SR21
FAQs
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What are the two models in the Datalogic SR21 series, and how do they differ in emission type?
The SR21 series is offered in two models: the SR21-IR, which uses infrared emission at 880 nm, and the SR21-RG, which uses dual red and green visible light emission. The SR21-IR is optimized for label or hole detection on continuous surfaces, while the SR21-RG is designed for color print register mark detection on transparent films.
What switching frequency and response time does the Datalogic SR21 achieve?
The SR21 reaches a switching frequency of 25 kHz with a response time of 20 µs maximum, making it suited for high-speed packaging and labelling line applications.
What is the slot width and mechanical protection rating of the Datalogic SR21?
The SR21 has a 2 mm slot width and a slot depth of 50 mm, and it carries an IP65 mechanical protection rating, allowing it to operate reliably in harsh industrial environments.
What power supply does the Datalogic SR21 require, and what output types does it provide?
The sensor operates on 10 to 30 Vdc with reverse polarity protection, and it provides both NPN and PNP outputs on separate pins, each with short-circuit protection and a maximum output current of 100 mA.
How is the Datalogic SR21 configured, and what setting modes are available?
Threshold setting is performed via an AUTO-SET push-button and supports static manual setting, static setting of only the support, and dynamic setting during normal label ribbon movement. Settings are retained in non-volatile EEPROM memory, and the push-button can be locked to prevent accidental changes during operation.
What is the operating temperature range and warranty coverage for the Datalogic SR21?
The SR21 operates from -20 to +60°C and is warranted to be free from defects for 36 months from the manufacturing date, with repair or replacement provided free of charge for defective units within that period.