{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3T-SR21 2M","brand":"Omron","brandSlug":"omron","productSlug":"E3T-SR21-2M","canonicalUrl":"https://aoctrl.com/omron/E3T-SR21-2M","factsUrl":"https://aoctrl.com/api/mcp/products/E3T-SR21%202M","rawCanonicalId":null},"summary":{"shortDescription":"Omron E3T series retroreflective photoelectric sensor, 12-24V DC NPN output, 2 m prewired cable, IP67, hygienic rated.","salesMarkdown":"The Omron E3T-SR21 2M is a retroreflective photoelectric sensor from the E3T series, built for washdown environments with an IP67 rating and hygienic feature. It uses a red light beam and a reflector to detect opaque objects down to 27 mm diameter at distances from 30 mm to 200 mm. Output is NPN, light-on switching — the transistor sinks current (max 50 mA) when it sees the reflected light. Power it with 12-24 V DC. The 1 msec response keeps it fast enough for most packaging lines. Cable is 2 m, prewired with bare ends. The rectangular body is only 7 mm wide and 24 mm tall, with the optical axis exiting at a right angle — good for tight spaces where the reflector must mount off to the side. ## Integration notes Mounting: The 7 mm wide body clips onto a bracket or sits in a slot. The right-angle exit means the cable runs along the mounting surface, not straight out — plan cable routing accordingly. IP67 handles hose-down cleaning, but the connector end is bare wire, so use a sealed junction box or overmold it outdoors. The hygienic feature suggests the PBT housing and sealing are food-grade compatible, but the 2 m prewired cable limits flexibility if you need longer runs — use the bare ends to splice in a longer cable if required.","metaTitle":"Omron E3T-SR21 2M Retroreflective Sensor, NPN, IP67","metaDescription":"Omron E3T-SR21 2M photoelectric sensor, retroreflective, 12-24V DC NPN output, 2m cable, IP67, sensing distance 30-200mm. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"title":"E3T-SR21 2M","Series":"E3T","Features":"Hygienic","IP Rating":"IP67","Standards":"CE","Display Qty":"1","description":"OMRON Photoelectric Sensor: Non-Terminated Cable, 12-24V DC, NPN, 2 m, DC-Only","Product Type":"Photoelectric Sensor","Body Material":"PBT","Overall Width":"7 mm","Response Time":"1 msec","Output Circuit":"NPN","Overall Height":"24 mm","Sensing Method":"Retroreflective","Supply Voltage":"12-24V DC","Sensor Diameter":"11 mm","lifecycle_stage":"current","Display Sell UOM":"EA","Sensor Body Style":"Rectangular","Minimum Object Size":"27mm Dia. Opaque","Output Circuit Type":"NPN","Sensor Cable Length":"2 m","Supply Voltage Type":"DC-Only","Emitted Sensor Light":"Red Light","Electrical Connection":"Bare Wire","Sensor Switching Mode":"Light On","Load Current - Maximum":"50 mA","Sensor Face Orientation":"Right Angle","DC Supply Voltage Rating":"12-24V DC","Includes Indicator Lights":"Indicator Lights Included","Sensing Distance - Maximum":"200 mm","Sensing Distance - Minimum":"30 mm","Electrical Installation Type":"Prewired Cable","Operating Temperature - Maximum":"131 °F","Operating Temperature - Minimum":"-13 °F","Cylindrical Sensor Dims. (D x L)":"24 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$85.47 – $183.60","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/27016bfa24f90532d6f0fc15d631f15e.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional alternative to E3T-SR21 2M?","answer":"E3T-SR22 2M is the same sensor except for switching mode — it is dark-on instead of light-on. Verify your control logic before substituting."},{"question":"What series is this sensor from?","answer":"It belongs to the Omron E3T series."},{"question":"Will E3T-SR21 2M drop into a panel wired for E3T-SR22 2M?","answer":"Mechanically identical, but the output logic is inverted. Light-on vs dark-on means the PLC input will need to be reconfigured or the wiring reversed."},{"question":"What are the hygienic features?","answer":"The sensor is listed as Hygienic, indicating suitability for washdown environments in food and beverage applications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3T-SR21-2M","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-SR21-2M 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}}