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Compact Fan and Filter Fan Air Flow Switch

Compact Fan and Filter Fan Air Flow Monitor


Item# FSW802B

Volume discounts available
Volume Discount Schedule
Quantity Price each
1-4 $51.80
5-9 $49.21
10-24 $48.17
25-49 $46.10
50-99 $45.07
100+ $44.03

In stock

Lead Time (If not in stock): 2 weeks
Compact Fan and Filter Fan Air Flow Monitor FSW802B FSW802B
  • Reliable Mechanical Switch Contact
  • Small Size
  • Economical
  • Easily Installs Via Clip or Clamp
  • Versatile Fields of Application

FSW802B Model Options

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Switch Rating and Type
Media Type
Velocity Range
Max Process Temperature
Wetted Materials
Wire Length

The FSW800B Series air-flow monitor provides a simple but reliable alternative to indicate positive or negative air flow of fans. When properly installed and connected in series with an optical (i.e. LED) or audible signaling device, a bi-directional switch will activate an electrical contact if the air flow of the fan falls below 8.2 ft/s, thus either turning the signaling device on or off.

Contact Type: Reed/magnet contact
NC (Normally Closed): Contact open with air flow
NO (Normally Open): Contact closed with air flow
Switching Threshold of Air Flow Speed: >8.2 ft/s (2.5 m/s)
Hysteresis: 3.3 ft/s (1 m/s)—fixed
Contact Resistance Includes Wire: 370 mΩ
Service Life: >100,000 cycles
Max. Switching Capacity: 10 W (resistive load)
Max. Switching Voltage: NC (AC/DC 240 V); NO (DC 60 V)
Max. Switching Current: NC (DC 500 mA); NO (DC 170 mA)
Connection: 2 x single strand AWG 26, length 500 mm (20'), tip of stranded wire stripped/tinned 5 mm (0.20')
Mounting: Attachment clamp and/or clip, or integrated in protective grill
Housing: Plastic, black
Dimensions: 34 x 17.5 x 7.5 mm (1.3 x 0.7 x 0.3')
Mounting Position: Air-flow monitor opening perpendicular to air flow
Operating Temperature: -20 to 50°C (-4 to 122°F)
Storage Temperature: -20 to 80°C (-4 to 176°F)
Protection Type: NEMA 1 (IP 20)
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Does this switch operate when airflow exceeds the set value in either direction? Or is the van movement dependent on the direction of the airflow?

Asked by: sini
Thank you for your inquiry. This switch is bi-directional and will work in either direction.
Answered by: AS Engineer
Date published: 2020-11-24
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