SIEMENS FDBZ492-HR Two-Wire Addressable Duct Detector with Relays Condition: New Brand: Siemens Status: Active SKU: 4596 Manufacturer Part #: FDBZ492-HR Secondary Part #: S54319-B23-A1 NOTE: The box is a little rough from storage in our warehouse, but the unit looks to be in new condition. Please look closely at the photos. When the Models FDBZ492, FDBZ492-R and FDBZ492-HR operating, a sample of air drawn from the duct and passed through the sampling chamber by means of the input sampling tube. The air sample passes through the smoke detector mounted in the duct housing; exhausted back into the duct through the outlet tube. This detector equipped with cover removal switches (SW1, SW2) that instantly provides a trouble condition upon removal of the clear cover. For all testing and inspection with the cover removed, the cover removal switches (designated as SW1, SW2 on PCB) must be manually depressed to simulate normal operation. This detector has a cover tamper (removal) switches. Care should be taken when installing the cover. Squarely place the cover on the unit to avoid possible damage to the switches. To prevent false alarms, do not mount in areas of extreme high or low temperatures, in areas where high humidity exists, or in areas where the duct may contain gases or excessive dust. The FDBZ492, FDBZ492-R and FDBZ492-HR contain an LED indicator capable of flashing either one of three distinct colors; green, yellow, or red. During each flash interval, the microprocessor based detector checks the following: For smoke in its sensing chamber That its critical smoke sensing electronics are operating All fire alarm parts should be installed and tested by a certified fire alarm professional as required by local codes and NFPA. Disclaimer: We are not affiliated with any fire alarm manufacturers or dealers. We offer high quality new and seller reconditioned reliable fire alarm parts to help you maintain your existing fire systems. We buy, sell, and liquidate excess fire alarm parts. *** PLEASE NOTE! Our store buys and sells a variety of new and used electronics, instruments, tools, antiques and many other items. We do our absolute best to thoroughly test all our merchandise and accurately describe and depict any flaw or defect we find. If you come across an issue that we have overlooked, please contact us - we will be happy to work with you to resolve the issue. *** We take our reputation seriously, we buy and sell online, so we understand the value of trust! If you are unsatisfied with your order, please contact us and we will work with you to resolve it to your satisfaction! Thanks for looking at our listing and supporting our small family business! SHELF: A