{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3RA-RN21","brand":"Omron","brandSlug":"omron","productSlug":"E3RA-RN21","canonicalUrl":"https://aoctrl.com/omron/E3RA-RN21","factsUrl":"https://aoctrl.com/api/mcp/products/E3RA-RN21","rawCanonicalId":null},"summary":{"shortDescription":"Omron E3RA series, retroreflective photoelectric sensor, M18 threaded cylindrical, NPN output, 3 m sensing range, 10-30V DC, 4-pin M12 connector, IP67/IP69K.","salesMarkdown":"## 3 m retroreflective with MSR for shiny targets The Omron E3RA-RN21 is a retroreflective photoelectric sensor in the E3RA series, delivering a 3 m sensing distance with a minimum opaque object size of 75 mm diameter. The built-in Mirror Surface Rejection (MSR) means it ignores reflections off shiny packaging or polished machine surfaces — a common false-trigger source that standard retroreflective sensors pick up. Response time is 0.5 ms, fast enough to catch parts on a high-speed conveyor without the PLC missing an edge. ## IP69K washdown — survives daily CIP Rated IP67 and IP69K, the E3RA-RN21 withstands high-pressure hot-water washdown. The plastic body and right-angle M12 connector face keep sealing surfaces out of the direct spray path. Supply voltage is 10-30V DC, NPN output with selectable Light On or Dark On switching. Maximum load current is 100 mA, enough to drive a PLC input or small relay directly. The indicator light confirms target presence during setup without a separate test box.","metaTitle":"Omron E3RA-RN21 Photoelectric Sensor, Retroreflective, NPN","metaDescription":"Omron E3RA-RN21 retroreflective photoelectric sensor, 3 m range, NPN output, 10-30V DC, M12 connector. IP67/IP69K rated for washdown environments.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"title":"E3RA-RN21","Series":"E3RA","Features":"Mirror Surface Rejection (MSR)","IP Rating":"IP67; IP69K","Standards":"CE","Display Qty":"1","description":"OMRON Photoelectric Sensor: M18 Threaded, Built-in Connector, 4 - Pin M12 Connector, 10-30V DC, NPN","Product Type":"Photoelectric Sensor","Body Material":"Plastic","Response Time":"0.5 msec","Number of Pins":"4","Output Circuit":"NPN","Overall Height":"58 mm","Sensing Method":"Retroreflective","Supply Voltage":"10-30V DC","Sensor Diameter":"17 mm","lifecycle_stage":"mature","Display Sell UOM":"EA","Overall Diameter":"18 mm","Sensor Body Style":"Cylindrical","Minimum Object Size":"75mm Dia. Opaque","Output Circuit Type":"NPN","Supply Voltage Type":"DC-Only","Emitted Sensor Light":"Red Light","Electrical Connection":"M12","Sensor Connector Type":"4 - Pin M12","Sensor Switching Mode":"Selectable Light On/Dark On","Load Current - Maximum":"100 mA","Nominal Sensor Diameter":"M18 Threaded","Sensor Face Orientation":"Right Angle","DC Supply Voltage Rating":"10-30V DC","Includes Indicator Lights":"Indicator Lights Included","Sensing Distance - Maximum":"3 m","Sensing Distance - Minimum":"100 mm","Electrical Installation Type":"Direct Connector","Operating Temperature - Maximum":"131 °F","Operating Temperature - Minimum":"-13 °F","Cylindrical Sensor Dims. (D x L)":"18 mm x 58 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cb161cb7bedb7d637b7bdaafc712e3f2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is the Omron E3RA-RN21 NPN or PNP output?","answer":"The E3RA-RN21 has an NPN output circuit, selectable for Light On or Dark On switching."},{"question":"Does the Omron E3RA-RN21 come with a connector?","answer":"Yes, the sensor has a built-in 4-pin M12 connector for direct connection to standard M12 cordsets."},{"question":"Is the Omron E3RA-RN21 suitable for washdown environments?","answer":"Yes, it carries IP67 and IP69K ratings, making it suitable for high-pressure hot-water washdown and CIP cycles common in food processing."},{"question":"What is the difference between Omron E3RA-RN21 and E3RA-RN22?","answer":"The E3RA-RN21 has an NPN output; the E3RA-RN22 is the PNP-output variant. Both share the same 3 m retroreflective range, MSR, IP69K rating, and M12 connector."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3RA-RN21","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/E3RA-RN21 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}