{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"E3FB-TN21","brand":"Omron","brandSlug":"omron","productSlug":"E3FB-TN21","canonicalUrl":"https://aoctrl.com/omron/E3FB-TN21","factsUrl":"https://aoctrl.com/api/mcp/products/E3FB-TN21","rawCanonicalId":null},"summary":{"shortDescription":"Omron E3FB-TN21, M18 threaded through-beam photoelectric sensor set with built-in M12 connector, NPN output, 20 m range, IP67/IP69K.","salesMarkdown":"## Through-beam set with 20 m reach The Omron E3FB-TN21 is a complete through-beam photoelectric sensor set – transmitter and receiver in one order code – with a 20 m sensing distance through opaque objects as small as 7 mm diameter. The M18 threaded brass body and right-angle face orientation suit tight panel layouts and washdown zones. Power it from 10–30 V DC; the NPN sinking output switches up to 100 mA with a 0.5 ms response. ## Connector vs prewired cable Compared to the sibling E3FB-TN112M (same through-beam, NPN, 20 m), the E3FB-TN21 trades a 2 m prewired cable for an M12 4-pin connector. Both carry identical electrical ratings and IP protection. The connector version simplifies replacement – unplug the old sensor instead of cutting and re-terminating cable – and standardizes on the same M12 breakout your panel may already use for other sensors. ## Output circuit: NPN vs PNP If your PLC input module is sinking (NPN), the E3FB-TN21 fits directly. For sourcing (PNP), order the E3FB-TP21 instead – same M12 connector, same 20 m range, same IP67/IP69K, but PNP output. Confirm your input circuit before specifying. ## Mounting and wiring in the panel The M18 threaded body mounts through an 18 mm hole with a right-angle face. The M12 4-pin connector and selectable Light On/Dark On switch simplify installation; rated IP67 and IP69K.","metaTitle":"Omron E3FB-TN21 Thru-Beam Sensor, 20m, IP69K","metaDescription":"Omron E3FB-TN21 M18 threaded through-beam photoelectric sensor set, NPN, 20m range, 10-30V DC, IP67/IP69K, M12 connector. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Photoelectric Sensors"],"specifications":{"title":"E3FB-TN21","Series":"E3FB","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 Set: M18 Threaded, Built-in Connector, 4 - Pin M12 Connector, 10-30V DC","Body Material":"Brass","Response Time":"0.5 msec","Number of Pins":"4","Output Circuit":"NPN","Overall Height":"48 mm","Sensing Method":"Through-Beam","Supply Voltage":"10-30V DC","Sensor Diameter":"18 mm","lifecycle_stage":"current","Display Sell UOM":"EA","Overall Diameter":"18 mm","Sensor Body Style":"Cylindrical","Minimum Object Size":"7mm 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","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":"20 m","Electrical Installation Type":"Direct Connector","Through Beam Sensor Component":"Photoelectric Sensor Transmitter and Receiver Set","Operating Temperature - Maximum":"131 °F","Operating Temperature - Minimum":"-13 °F"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$46.99","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a3f9846f73a7e5091e288c0871f0cd10.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest functional second-source for the E3FB-TN21?","answer":"The E3FB-TN112M is the same through-beam NPN 20m sensor but with a 2m prewired cable instead of an M12 connector. Electrical ratings, range, and IP grade are identical."},{"question":"Will the E3FB-TN21 drop into a panel specified for the E3FB-TN112M without rewiring?","answer":"The mounting dimensions are identical (M18, 48 mm height), but the E3FB-TN21 requires an M12 cable assembly. If the panel was wired for bare wires from the TN112M, you would need to add an M12 mating cable or change the termination."},{"question":"What compliance documentation does Omron provide for the E3FB-TN21?","answer":"CE marked per the specification listing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/E3FB-TN21","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/E3FB-TN21 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}}