--- title: Smoke Detector Sensitivity Testing Frequency description: See the smoke detector sensitivity testing schedule, when a five-year interval may be allowed, and which records help determine when testing is due. image: https://blog.centuryfp.com/hubfs/2H2B4967-1.jpg --- - [SHOP OUR PARTS STORE](https://www.store.centuryfp.com/?utm_source=cfp_corp&utm_medium=referral&utm_campaign=corp) - [EMERGENCY SERVICE: 866 530 3473](https://www.centuryfp.com/tel:8665303473) - [REQUEST SERVICE](https://info.centuryfp.com/request-for-service) - [EMPLOYEE LOGIN](https://www.centuryfp.com/employee-login/) - [CLIENT LOGIN](https://www.centuryfp.com/client-login/) - [PAY INVOICE](https://pay.supplierpayments.com/payment/e8f8cad4-4f64-448b-8fa1-73ad4b080e77) [![Century_Logo](https://blog.centuryfp.com/hs-fs/hubfs/Imported%20images/logo.png?width=231&height=137&name=logo.png "Century_Logo")](https://www.centuryfp.com) - [ABOUT](https://www.centuryfp.com/about/) - [ABOUT](https://www.centuryfp.com/about/) - [LEADERSHIP](https://www.centuryfp.com/leadership/) - [SOCIAL PURPOSE](https://www.centuryfp.com/social-purpose/) - [PARTNERING & ACQUISITIONS](https://www.centuryfp.com/partner-with-us/) - [SYSTEMS](https://www.centuryfp.com/systems/) - [SYSTEMS](https://www.centuryfp.com/systems/) - [SPRINKLER](https://www.centuryfp.com/systems/#sprinklers) - [ALARM](https://www.centuryfp.com/systems/#alarm) - [SPECIAL HAZARDS](https://www.centuryfp.com/systems/#hazards) - [EXTINGUISHERS](https://www.centuryfp.com/systems/#extinguishers) - [SERVICES](https://www.centuryfp.com/services/) - [SERVICES](https://www.centuryfp.com/services/) - [NATIONAL ACCOUNTS](https://www.centuryfp.com/services/#national-accounts) - [VERTICAL MARKETS](https://www.centuryfp.com/vertical-markets/) - [PARTS STORE](https://www.store.centuryfp.com/) - [PARTS STORE](https://www.store.centuryfp.com/) - [CAREERS](https://www.centuryfp.com/careers/) - [CAREERS](https://www.centuryfp.com/careers/) - [CULTURE](https://www.centuryfp.com/culture/) - [EDUCATION & TRAINING](https://www.centuryfp.com/education-training/) - [EDUCATION & TRAINING](https://www.centuryfp.com/education-training/) - [RESOURCE LIBRARY](https://info.centuryfp.com/resources) - [BLOG](https://blog.centuryfp.com) - [CONTACT](https://www.centuryfp.com/contact/) - [CONTACT](https://www.centuryfp.com/contact/) - [LOCATIONS](https://www.centuryfp.com/contact/#Locations) - [SUBMIT A REQUEST](https://info.centuryfp.com/request-for-service) ![Smoke Detectors](https://blog.centuryfp.com/hubfs/2H2B4967-1-1.jpg) # Smoke Detector Sensitivity Testing Frequency - [Home](https://www.centuryfp.com/) - [Century Fire Protection Blog](https://blog.centuryfp.com) - Smoke Detector Sensitivity Testing Frequency Posted May 18, 2018 [Tiffany](https://blog.centuryfp.com/author/tiffany) [Fire Alarm](https://blog.centuryfp.com/topic/fire-alarm), [Fire Protection](https://blog.centuryfp.com/topic/fire-protection), [Smoke Detectors](https://blog.centuryfp.com/topic/smoke-detectors) [0 Comments](https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements-1#postComment) 3 Minutes Last updated August 18, 2026 ## How Often Is Smoke Detector Sensitivity Testing Required? The general NFPA 72 schedule calls for a smoke detector sensitivity check within one year after installation and every alternate year after that. After the second required check, the interval may be extended to a maximum of five years when the detector has remained within its listed range and the applicable conditions are met. *Code note: The five-year interval is not automatic, and it does not replace the other inspections and tests required for the fire alarm system (NFPA 72 14.4.4.3.1-3).* *This article references the 2013, 2016, 2019, 2022 & 2025 editions of NFPA 72 National Fire Alarm and Signaling Code®. The NFPA 72 edition adopted by your jurisdiction, local amendments, the detector listing, manufacturer instructions and AHJ direction can affect the schedule.* ## Smoke detector sensitivity testing schedule | **Point in the cycle** | **General timing** | **What system owners and operators should know** | | --- | --- | --- | | First check | Within one year after installation | Use the installation date and detector records to establish the due date. | | Second check | Every alternate year after the first check | In plain language, 'every alternate year' generally means every other year. | | Possible extended interval | Up to five years after the second required check | Only when the required results and records support the extension. The interval cannot exceed five years. | | Additional checks | When conditions, records, or the AHJ indicate it is needed | An increase in detector-caused nuisance alarms can trigger sensitivity testing in the affected zone or area. |   ### When can the interval extend to five years? After the second required sensitivity check, NFPA 72 permits a longer interval when the results show that the detector has remained within its listed and marked sensitivity range. The maximum interval is five years *(NFPA 72 14.4.4.3.1-3)*. Before using the longer interval, confirm all of the following: 1. 1. 1. The detector has the required test history and has remained within its listed range. 2. The building has complete records that support the installation and test dates. 3. Detector-caused nuisance alarms and trends are being tracked when the interval is extended. 4. The detector listing, manufacturer instructions, adopted code and local amendments do not require a shorter interval. 5. The AHJ accepts the schedule for the installed system. If nuisance alarm records show an increase in a zone or area, sensitivity testing must be performed for the affected area rather than waiting for the end of the extended interval *(NFPA 72 14.4.4.3.3.1)*.   ### What records determine the next due date? The next due date is difficult to defend without a clear device history. Keep the following information together with the fire alarm inspection records: 1. 1. 1. Detector installation or replacement date. 2. Previous sensitivity check dates and results. 3. The method used, including panel-generated reports when applicable. 4. The detector location, address or zone and the relevant make and model. 5. Any cleaning, adjustment, recalibration, replacement and follow-up verification. 6. Records of detector-caused nuisance alarms and year-over-year trends when using an extended interval. ### What if the last sensitivity test date is unknown? Do not guess. Start by collecting prior inspection reports, panel exports, deficiency reports, invoices and detector replacement records. A qualified fire alarm contractor can inventory the installed devices, review the system's sensitivity capabilities and help establish a documented baseline. If the records cannot establish compliance, coordinate the next step with the AHJ.   ### What if a detector is replaced? Track the replacement date for the individual detector. A new detector has its own installation history, even when the rest of the devices in the building are on a different cycle. Good device-level records prevent a single system-wide date from masking newer or older detectors.   ### What happens after an out-of-range result? A detector outside its listed sensitivity range needs corrective action. Depending on the detector and manufacturer instructions, that can mean cleaning and recalibration, a permitted field adjustment or replacement. The detector should then be verified before the deficiency is closed *(NFPA 72 14.4.4.3.4-5).*   For a deeper explanation of the approved methods and failed-result process, read [Smoke Detector Sensitivity Testing Requirements](https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements).   ## Make the schedule easier to manage Download Century Fire's [Smoke Detector Sensitivity Testing Cheat Sheet](https://info.centuryfp.com/cheat-sheet-for-smoke-detector-sensitivity-testing) for a quick reference. [Request service](https://info.centuryfp.com/request-for-service) to schedule testing or if you need help reviewing detector records, panel capabilities or an open deficiency. [GET IN TOUCH](https://info.centuryfp.com/request-for-service)   **Need a replacement smoke detector?** Shop our**[Century Fire Parts Store](https://www.store.centuryfp.com/?utm_source=cfp_corp&utm_medium=referral&utm_campaign=corp)** for quick replacements.  [![CTA Smoke Detector Sensitivity Resource-1](https://blog.centuryfp.com/hs-fs/hubfs/CTA%20Smoke%20Detector%20Sensitivity%20Resource-1.png?width=823&height=343&name=CTA%20Smoke%20Detector%20Sensitivity%20Resource-1.png)](https://info.centuryfp.com/cheat-sheet-for-smoke-detector-sensitivity-testing)   The information provided is for general informational purposes only. Every fire protection system is unique, with specific inspection, testing, and maintenance requirements determined by system type, manufacturer specifications, building use, and local regulations. Consult a qualified fire protection professional or your local Authority Having Jurisdiction (AHJ) to ensure compliance with applicable standards. Century Fire Protection assumes no liability for actions taken based on this content. --- #### Tag: [Fire Alarm](https://blog.centuryfp.com/topic/fire-alarm) [Fire Protection](https://blog.centuryfp.com/topic/fire-protection) [Smoke Detectors](https://blog.centuryfp.com/topic/smoke-detectors) --- #### [Smoke Detector Sensitivity Testing Requirements Previous Post](https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements) #### [Build a Career that Burns Bright at Century Fire Protection Next Post](https://blog.centuryfp.com/build-a-career-that-burns-bright-at-century-fire-protection) --- ## Related Posts [Fire Alarm](https://blog.centuryfp.com/topic/fire-alarm), [Fire Protection](https://blog.centuryfp.com/topic/fire-protection), [Smoke Detectors](https://blog.centuryfp.com/topic/smoke-detectors) [Tiffany](https://blog.centuryfp.com/author/tiffany) 27 April, 2018 #### [Smoke Detector Sensitivity Testing Requirements](https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements) Guide to Smoke Detector Sensitivity Testing Requirements for Building Owners and Operators Smoke… [Read More](https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements) ### CONTACT 2450 Satellite Boulevard Duluth, GA 30096 p:[770 945 2330](tel:+17709452330) f:[770 945 2651](tel:+17709452651) - [US Privacy Policy](https://info.centuryfp.com/general_privacy_policy) - [California Privacy Policy](https://info.centuryfp.com/ca_privacy_policy) - [Terms of Use](https://info.centuryfp.com/terms_of_use) - Your Privacy Choices ![Great Place to Work GPTW Badge 25-26 Footer (1)](https://blog.centuryfp.com/hubfs/Great%20Place%20to%20Work%20GPTW%20Badge%2025-26%20Footer%20(1).png) - - - Copyright 2026 Century Fire Protection | All Rights Reserved ```json { "@context" : "https://schema.org", "@id" : "https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements-1", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Tiffany" }, "dateModified" : "2026-08-18", "datePublished" : "2018-05-18", "headline" : "Smoke Detector Sensitivity Testing Frequency", "image" : [ "https://cdn2.hubspot.net/hubfs/2067630/2H2B4967-1.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements-1", "@type" : "WebPage" }, "url" : "https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements-1" } ``` ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Tiffany", "url" : "https://blog.centuryfp.com/author/tiffany" }, "dateModified" : "2026-08-24T15:58:03.892Z", "datePublished" : "2018-05-18T19:14:59.000Z", "headline" : "Smoke Detector Sensitivity Testing Frequency", "image" : [ "https://blog.centuryfp.com/hubfs/2H2B4967-1.jpg" ], "mainEntityOfPage" : { "@id" : "https://blog.centuryfp.com/smoke-detector-sensitivity-testing-requirements-1", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://blog.centuryfp.com/hubfs/Imported%20images/logo.png" }, "name" : "Century Fire Protection, LLC" } } ```