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System Sensor 4WTA-B Photoelectric i3 Series Smoke Detector
D (including lens and speaker)
Siemens HTRI-S (500-033370) Single Input Module
spray a small amount of CO into the detector per the installation instructions
Siemens TRI-D (500-896226) Intelligent Interface Dual Input Module
System Sensor D4120W Duct Smoke Detector 4-Wire Silent Knight System Sensor 4WTA-B Photoelectric i3System Sensor D4120W Watertight 4 Wire Photoelectric Duct Smoke Detector, 24VDC 120VAC Key Features NEMA Type 4 UL listed for non hazardous indoor and outdoor applications 4 Wire Photoelectric, integrated low flow technology UV Resistant, UL listed housing and cover materia
US$ 208.16
US$ 158.28
US$ 1792.36
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US$ 292.01
US$ 354.42