{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3FA-DN21","brand":"Omron","brandSlug":"omron","productSlug":"E3FA-DN21","canonicalUrl":"https://aoctrl.com/omron/E3FA-DN21","factsUrl":"https://aoctrl.com/api/mcp/products/E3FA-DN21","rawCanonicalId":null},"summary":{"shortDescription":"OMRON Photoelectric Sensor, E3FA Series, Diffuse, M18 Threaded, NPN, M12 4-Pin, 10-30V DC, 100 mm Sensing Distance, IP67/IP69K.","salesMarkdown":"E3FA-DN21 is an M18 cylindrical diffuse NPN sensor from the E3FA family with 100 mA max output. It has a 100 mm sensing range and 0.5 msec response for small-part presence detection. Supply is 10-30 VDC with an M12 4-pin connector. ## Protections and washdown rating Three built-in protections—output reverse polarity, output short circuit, and power supply reverse polarity—cover the common failure modes during installation or wiring errors. The IP67/IP69K enclosure means this sensor survives high-temperature, high-pressure washdown cycles, making it a fit for food, beverage, and pharmaceutical lines where moisture ingress is the primary failure driver. Operating temperature spans -13 °F to 131 °F; stay within that range to avoid false readings from thermal drift on the photodiode. ## Connection variant comparison If replacing a pre-wired E3FA-DN112M, the -DN21 changes the termination: the -DN21 uses a 4-pin M12 connector instead of a 2-meter bare-wire cable. The sensing performance—100 mm diffuse range, red LED, light-on/dark-on selectable, 0.5 msec response—is identical. On a swap, you'll need an M12 cordset or a field-attachable connector to match the existing wiring; no change to the mounting or bracket. Versus the PNP variant E3FA-DP21, the output type is the only difference: -DN21 is NPN, -DP21 is PNP. All other specs—range, connection, protection, ratings—are shared. Swapping requires verifying the PLC input sink/source compatibility; supply and wiring are otherwise identical.","metaTitle":"OMRON E3FA-DN21 Photoelectric Sensor, Diffuse NPN, IP67/IP69","metaDescription":"OMRON E3FA-DN21 M18 threaded diffuse sensor with M12 connector, 100mm range, 0.5ms response, NPN output, IP67/69K. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"title":"E3FA-DN21","Series":"E3FA","Features":"Output Reverse Polarity Protection; Output Short Circuit Protection; Power Supply Reverse Polarity Protection","IP Rating":"IP67; IP69K","Standards":"CE","Display Qty":"1","description":"OMRON Photoelectric Sensor: M18 Threaded, Built-in Connector, 4 - Pin M12, 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":"45 mm","Sensing Method":"Diffuse","Supply Voltage":"10-30V DC","Sensor Diameter":"17 mm","lifecycle_stage":"current","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 Switching Mode":"Selectable Light On/Dark On","Load Current - Maximum":"100 mA","Sensor Face Orientation":"Right Angle","DC Supply Voltage Rating":"10-30V DC","Includes Indicator Lights":"Indicator Lights Included","Sensing Distance - Maximum":"100 mm","Electrical Installation Type":"Direct Connector","Operating Temperature - Maximum":"131 °F","Operating Temperature - Minimum":"-13 °F"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$29.97","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/301b2ce2534008631db0078eadb62d53.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What's the closest functional second-source to the E3FA-DN112M?","answer":"E3FA-DN21 is functionally identical except for the connection: -DN21 has an M12 connector, while -DN112M has a 2 m pre-wired cable. Sensing range, response time, output type, and protection features are the same."},{"question":"What protection features does E3FA-DN21 include?","answer":"It includes output reverse polarity protection, output short circuit protection, and power supply reverse polarity protection."},{"question":"Will E3FA-DN21 drop into a panel wired for E3FA-DN112M?","answer":"Mechanical mounting and sensing performance are identical. The only change is the connection termination: you will need an M12 cordset or field-attachable connector to adapt to the existing wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3FA-DN21","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/E3FA-DN21 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}}