Series AVFS Air Flow Switch

Monitors Flow in Ducts with Contact Output and Local LED Indication

The Series AVFS Adjustable Air Flow Switch is specifically designed to monitor air flow in ducts and provides a 3 A contact output to indicate a change or loss of flow. The AVFS provides a ±5% set-point repeatability across a full scale range of 1-10 m/s (197-1969 fpm) and includes a mounting bracket for quick duct mounting.

Product Applications

  • Fan monitoring
  • Filter monitoring
  • Damper feedback
  • Air handlers

Models & Ordering

Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

Model Description Usually Ships* Price Code Order
Ships: Same Day
Price: $264.00
Thermo air flow switch, 80-250 AC/DC. Same Day* $264.00 B Order
Ships: Same Day
Price: $264.00
Thermo air flow switch, 24 VDC. Same Day* $264.00 B Order


Air Velocity Range:
197-1969 FPM (1-10 m/s).
Temperature Limits:
5 to 122°F (-10 to 50°C).
Humidity Limits:
0-90% RH.
Wetted Materials:
PBT body, titanium sensor.
Pressure Limit:
14.7 psig (1 bar).
±5% FS.
Switch Type:
Electrical Rating:
3 A @ 30 VDC/250 VAC.
Response Time:
3-60 seconds. Varies with flow and set point.
Power Requirement:
AVFS-1: 80 to 250 AC/DC (47 to 63 Hz AC). AVFS-2: 24 VDC ±25%.
Power Consumption:
3 VA.
Electrical Connection:
6.5' (2 m) cable.
Enclosure Rating:
1 Red LED/1 Green LED.
7.2 oz (203 g).
Agency Approvals:


  • Integral red/green air flow status LED’s
  • Flush sensor design limits issues due to dust or particulate in the air flow
  • IP65 construction

Product Literature


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