{"product_id":"edwards-est-siga-ddos-optica-intelligent-addressable-hvac-duct-smoke-detector","title":"Edwards EST SIGA-DDOS Optica Intelligent Addressable HVAC Duct Smoke Detector","description":"\u003ch4 class=\"PDq2pG_selectionAnchorContainer\"\u003eDescription\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp dir=\"auto\" data-start=\"16\" data-end=\"396\"\u003e\u003cmeta charset=\"UTF-8\"\u003eThe Edwards EST SIGA-DDOS is an Optica intelligent addressable duct smoke detector designed to detect smoke in HVAC ductwork before it can circulate throughout a building. Edwards EST part number SIGA-DDOS combines photoelectric light-scattering detection, Signature Series intelligence, environmental compensation, and an onboard Form C relay for reliable smoke detection and auxiliary HVAC control.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEdwards EST\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFire Alarm \u0026amp; Life Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSIGA-DDOS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDuct Smoke Detectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOptica \/ Signature Series\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eIntelligent Addressable Duct Smoke Detector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePhotoelectric Light Scattering\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15.2–19.95 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50 μA Standby; 60 μA Alarm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSmoke Sensitivity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1.5%–4.5% Obscuration\/ft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAir Velocity Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e100–4,000 ft\/min\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAir Pressure Differential\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.01–0.83 in. of Water\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAlarm Test Response Time\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 Seconds\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAuxiliary Relay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eOne Form C, Unsupervised, Power-Limited\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelay Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 A @ 30 VDC; 3 A @ 120 VAC (0.35 PF); 1.5 A @ 240 VAC (0.35 PF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLED Indicators\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAlarm – Red; Test – Amber; Normal – Green\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-20°F to 158°F (-29°C to 70°C)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRelative Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–93% RH, Noncondensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWire Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14–22 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 7.75 × 6.1 × 2.5 in. (197 × 155 × 65 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAgency Listings\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUL, ULC, CSFM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 1.5 lb (0.68 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About \u003cspan data-sheets-root=\"1\"\u003eSIGA-DDOS\u003c\/span\u003e\n\u003c\/h4\u003e\n\u003cp\u003e\u003cspan\u003eThe SIGA-DDOS is an Edwards Optica and Signature Series intelligent duct detector designed for connection to compatible Edwards Signature loop controllers. Its photoelectric sensing system uses digital signal processing, environmental compensation, and differential sensing to evaluate smoke conditions while compensating for environmental changes and detector contamination. The low-profile housing is less than 2.5 inches deep and accommodates adjustable sampling-tube positioning, allowing installation in restricted HVAC spaces and ducts with air velocities from 100 to 4,000 ft\/min. Integrated diagnostics, dirty or defective detector identification, LED status indication, a magnet-activated test function, and a Form C auxiliary relay simplify commissioning, maintenance, and HVAC equipment control.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eKey Features:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eOptica photoelectric detection: Uses the light-scattering principle to detect smoke particles in air moving through HVAC ductwork.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSignature Series intelligence: Provides intelligent addressable operation with compatible Edwards Signature loop controllers.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWide airflow range: Rated for duct air velocities from 100 to 4,000 ft\/min for diverse HVAC applications.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBroad sensitivity range: Supports smoke sensitivity from 1.5% to 4.5% obscuration per foot.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEnvironmental compensation: Adjusts for changing environmental conditions to maintain stable detection performance over time.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDifferential sensing: Analyzes changing conditions to improve detection reliability and reduce unwanted alarm activity.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLow-profile housing: Less than 2.5 inches deep for installations where available duct or ceiling space is limited.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFlexible sampling tube: Sampling tube can be rotated in 45-degree increments for alignment with duct airflow.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eIntegrated auxiliary relay: One Form C alarm relay provides switching capability for HVAC shutdown and other ancillary equipment.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStatus indication: Red alarm, amber test, and green normal LEDs provide clear local operating information.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMagnet-activated testing: Allows convenient functional testing during commissioning and scheduled fire alarm maintenance.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDetector diagnostics: Identifies dirty or defective detector conditions to simplify troubleshooting and preventive maintenance.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThe SIGA-DDOS delivers the reliability and precision required for intelligent duct smoke detection, HVAC shutdown control, and addressable fire alarm monitoring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp id=\"p-rc_c7b8f4fae39e183e-25\"\u003e\u003c\/p\u003e\n\u003cul\u003e\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e","brand":"Edwards EST","offers":[{"title":"Default Title","offer_id":52794621526314,"sku":"SIGA-DDOS","price":389.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/s-l960_063e039d-0c66-45e9-a4e7-cc2e28f7a68d.webp?v=1790712396","url":"https:\/\/iqelectro.com\/products\/edwards-est-siga-ddos-optica-intelligent-addressable-hvac-duct-smoke-detector","provider":"IQElectro","version":"1.0","type":"link"}