{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3T-SR21 5M","brand":"Omron","brandSlug":"omron","productSlug":"E3T-SR21-5M","canonicalUrl":"https://aoctrl.com/omron/E3T-SR21-5M","factsUrl":"https://aoctrl.com/api/mcp/products/E3T-SR21%205M","rawCanonicalId":null},"summary":{"shortDescription":"Omron, E3T series, retroreflective photoelectric sensor, E3T-SR21 5M, NPN Light-ON output, 10-200mm adjustable range, 12-24V supply, IP67.","salesMarkdown":"## Sensor Overview The Omron E3T-SR21 5M is a compact retroreflective sensor from the E3T series, providing a 200 mm adjustable sensing range with NPN Light-ON output. Red LED (650 nm) emitter, 1 ms response time, and IP67 rating make it suited for packaging, material handling, and automated assembly lines where space is tight. Sensing distance adjustable 10–200 mm via potentiometer to match the reflector distance. NPN open collector, Light-ON logic: the output transistor switches on when the light from the reflector is received. Verify your PLC input is sinking (NPN compatible) and that the load current stays under the device's maximum (not listed, but standard for this class). 12–24 VDC supply; the panel 24 V bus can power the sensor. IP67 enclosure: withstands washdown, dust, and oil mist. Mount with cable entry downward to prevent water ingress. ## Cross-Shop Note: E3S-AR86 The E3S-AR86 is a larger retroreflective sensor with a 2 m fixed range, PNP output (Dark-ON/Light-ON selectable), and a connector instead of a pigtail. If your BOM was cut for an E3S-AR86, dropping in this E3T-SR21 means rewiring for NPN and mounting a smaller bracket. For a clean swap, you need the E3S-AR86; this E3T is for new builds where short range and NPN logic match the controller. ## Field Fit & Wiring Cable pre-wired: strip and terminate to a terminal block. Brown (supply), blue (0V), black (NPN output). No shield needed. Operating temperature -25°C to 55°C: fine for most indoor factory environments. Avoid direct sunlight on the lens or placement near ovens.","metaTitle":"Omron E3T-SR21 5M Retroreflective Sensor, NPN, 200mm, IP67","metaDescription":"Active production Omron E3T-SR21 5M retroreflective sensor. 10-200mm adjustable range, NPN Light-ON output, 12-24V supply, IP67 enclosure. Inquiry for quantity pricing.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"Series":"E3T","Packaging":"Bulk","Light Source":"Red (650nm)","Manufacturer":"Omron Automation and Safety","Response Time":"1ms","Sensing Method":"Retroreflective","lifecycle_stage":"current","Sensing Distance":"0.394\" ~ 7.874\" (10mm ~ 200mm) ADJ","Voltage - Supply":"12V ~ 24V","Connection Method":"Cable","Ingress Protection":"IEC IP67","Output Configuration":"NPN - Open Collector/Light-ON","Operating Temperature":"-25°C ~ 55°C"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/E3T-SR21%205M/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3T-SR21-5M","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/omron/E3T-SR21-5M when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}