Duct Airflow Switch for Fan Linkage: The KY265AFS12V senses airflow in HVAC ducts. When airflow is detected, the relay closes and the 12V DC output powers the connected device, such as a duct UV lamp or air purifier module. When there is no airflow, the relay opens, the output is off and the controller stays in standby.
Engineering Highlights
01. Sensitive, Adjustable Sensing
Minimum sensed airflow 0.3 m/s, with adjustable airflow sensing to suit different ducts and fans.
02. Automatic Fan Linkage
Relay closes with airflow and opens without airflow, so connected devices run only while the fan runs.
03. LED Status Indication
Red LED: power. Green LED: airflow detected (off when no airflow).
04. Power-On Start Logic
For about 45 s after power-on, the controller defaults to "airflow present" (relay closed, green LED on), then switches to normal airflow sensing.
Technical Specifications
Model
KY265AFS12V
Power Input (J1)
12V DC
Power Output (J2)
12V DC, relay switched by airflow
Sensor Interface (P1)
XH connector for airflow sensor
Min. Sensed Airflow
0.3 m/s (adjustable)
Operating Temperature
-10℃ ~ 50℃
Indicators
Red LED: power / Green LED: airflow
Applications
HVAC duct UV lamps · Duct air purifiers & ionizers · Central AC fan linkage
OEM / ODM Projects
HVAC and air purifier manufacturers: contact us with your voltage, sensing and PCB requirements.
