System Sensor D4120 Photoelectric Smoke Detector

Description:

The System Sensor D4120 photoelectric smoke detector is used in HVAC fire detection and life safety systems. Commonly installed in air handling units, ventilation ducts, commercial buildings, and industrial facilities. Maintenance teams and system integrators use this part for repair, retrofit, expansion, and replacement.

Applications:

The System Sensor D4120 photoelectric smoke detector is designed to detect smoke within HVAC ductwork and initiate alarm or shutdown functions to prevent smoke circulation throughout a building. It is commonly used in ventilation systems, air handling equipment, manufacturing facilities, and fire protection networks where reliable smoke detection and fire response are required.

Technical Specifications:

• Brand: System Sensor
• Part number: D4120
• Product type: Photoelectric smoke detector
• Series: InnovairFlex
• Detection technology: Photoelectric sensing
• Configuration: Four-wire duct-mounted detector
• Air velocity range: 100 to 4,000 ft/min (0.5 to 20.32 m/s)
• Operating temperature: -4°F to 158°F (-20°C to 70°C)
• Humidity range: 0% to 95% non-condensing
• Mounting type: Round or rectangular duct mounting
• Relay configuration: DPDT alarm relay and SPST trouble relay
• Housing design: Pivoting enclosure for multiple duct configurations
• Application: HVAC smoke detection and fire protection systems

Common Replacements:

• System Sensor D4120W
• System Sensor DNR
• System Sensor DH100ACDC