System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector Main
System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector Main
ALLTEK ALR12.5 + 45 Run Capacitor Main ALLTEK ALR45 Run Capacitor 45 µF 370/440V – Round Motor Start/Run Capacitor
45X370 motor run capacitor, 35 MFD 370V AC, cylindrical design with dual terminals 35X370 Motor Run Capacitor – 35 MFD, 370V AC, UL Listed, Long Life, Non-PCB

System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector

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$206.88

The System Sensor D4120 is a 4-wire photoelectric duct smoke detector featuring integrated low-flow technology, a plug-in sensor head for enhanced false alarm immunity, and versatile mounting options. It operates in airflow speeds from 100 to 4,000 ft/min and is compatible with 24 VAC/DC or 120 VAC power sources.

Availability: 2 in stock SKU: D4120

Description

The System Sensor D4120 is a 4-wire photoelectric duct smoke detector designed for HVAC systems to detect smoke in air ducts. It features integrated low-flow technology, allowing it to operate effectively in airflow speeds ranging from 100 to 4,000 feet per minute. The detector is housed in a versatile, pivoting housing that fits both square and rectangular footprints, making it suitable for various duct configurations.

Equipped with a plug-in sensor head, the D4120 offers superb false alarm immunity and simplifies installation, testing, and maintenance. The improved cover design isolates the sensor head from the low-flow feature, facilitating easy maintenance. The detector also includes a ¾-inch conduit knockout, providing increased wiring space.

Additional features include a Test/Reset button, improved LED status indicators, a patented interconnect feature for multi-fan shutdown, and built-in short circuit protection to prevent wiring errors. The D4120 is compatible with 24 VAC/DC or 120 VAC power sources and is backward compatible with existing Innovair products, including remote accessories.

Additional information

Weight 3.6 lbs
Dimensions 14.5 × 5 × 2.5 in
Brand

System Sensor
Model

D4120
Type

Photoelectric Duct Smoke Detector
Wiring

4-wire
Airflow Range

100 to 4,000 ft/min
Sensor Head

Plug-in, serviceable design
Test/Reset Button

Yes
LED Indicators

Status LEDs for easy diagnostics
Voltage

24 VAC/DC or 120 VAC
Short Circuit Protection

Built-in
Relay Contacts

2 DPDT Form-C
Enclosure

Galvanized steel housing

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