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Airflow-Actuated HVAC Switches
Use this switch to sense changes in airflow velocity in duct. The paddle extends into the duct and actuates the switch when airflow reaches the setpoint. Switch is rated NEMA 3R for protection from dirt, falling liquids, and light splashing.
Paddle | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Setpoint, fpm | Temperature Range, °F | Current | Electrical Connection Type | Switch Type | For Conduit Trade Size  | Knockout Dia. | Material | Ht. | Wd. | For Use Outdoors | Environmental Rating | Specifications Met | Each | |
Paddle Sensor | ||||||||||||||
| 350-500 | 32° to 104° | 10 A @ 240 V AC 16 A @ 120 V AC | Screw Terminal | SPDT | 1/2 | 7/8" | Stainless Steel | 6 7/8" | 3 1/8" | Yes | IP43, NEMA 3R | UL Listed, C-UL Listed, CE Marked | 0000000 | 0000000 |
Air-Pressure-Actuated HVAC Switches
Often used to detect clogged air filters and iced air conditioner coils, these switches sense small changes in pressure between two points in your duct.
| Setpoint, in. of H2O | Accuracy, in. of H2O | Temperature Range, °F | Current | Electrical Connection Type | Switch Type | Max. Pressure, psi | Low Pressure Side Connection | High Pressure Side Inside Connection | High Pressure Side Outside Connection | Each | |
Diaphragm Sensor | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0.05-5 | 0.025 | -40° to 165° | 2.9 A @ 240 V AC 5.8 A @ 120 V AC | Hardwire | SPDT | 1 | 1/8 NPT Female | 1/8 NPT Female | 1/2 NPSM | 000000 | 0000000 |
| 0.05-5 | 0.04 | -40° to 165° | 4.9 A @ 240 V AC 9.8 A @ 120 V AC | Hardwire | SPDT | 1 | 1/8 NPT Female | 1/8 NPT Female | 1/2 NPSM | 000000 | 000000 |
Airflow Modules for Development Boards
Position these modules in vents or near sensitive electronics to monitor airflow. Unlike handheld meters, these modules continuously monitor airflow and alert you to changes. Connect them to development boards with Qwiic cords or by soldering.
Output Data | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Airflow, mph | Airflow Tolerance, mph | Resolution, bit | Frequency, Hz | Input Voltage | I2C Address | No. of Qwiic Connections | Lg. | Wd. | Each | |
I2C Communication Protocol—Qwiic Connection | ||||||||||
| 0-33.6 | -1.68 to 1.68 | 12 | 8 | 2.7-3.3V DC | 0x28 | 2 | 1" | 1" | 0000000 | 000000 |