Home / S-Series Air Velocity & Temperature Switches
Airflow switch for air velocity and temperature.

S-Series Switches

Robust Air Velocity & Temperature Switch

The S-Series is a specialized platform of air velocity and temperature switches optimized for demanding applications including laboratory, HVAC, high-performance electronics, and more. With both relay and open drain outputs available and configurable alarm behaviors, the S-Series is the most customizable, high-performance airflow switch platform on the market.
Non-directional airflow switch.

Non-Directional Option

Non-directional switches will sense flow from either direction. Non-directional enjoy a performance advantage and are the most popular.
Directional airflow switch.

Directional Option

Directional switches only sense flow from one direction, and are immune to flow reversals.
Airflow switch installation is easy and requires no screws or hands inside the duct.

Innovative “Outside the Duct” Installation

Single hole for mounting sensor assembly, without the need for screws or hands inside the duct
Available Outputs
Open Drain or Relay (N.O./N.C. Polarities)
Air Velocity or Temperature Switching
Trip points may be configured for both air velocity and/or air temperature
Universal Voltage Supply
Suitable for applications where an AC or DC supply voltage is encountered
Alarm Behaviors
Configurable Trip Point, Alarm Delay, & Recovery Point

Specs & Details

  • Velocity Range: 0.15m/s to 20m/s (30 fpm to 4,000 fpm)
  • Operating Temperature: -10°C to 60°C (14°F to 140°F)
  • Supply Power Requirements: 4.5 - 29 VDC, 35mA; 24 VAC/VDC (S500)
  • Digital Output: UART or I²C available for airflow & temperature
  • Alarm Output: Open drain, configurable trip point
S300 (4.5 - 12 VDC)
S400 (19 - 29 VDC)
S500 (24 VAC/VDC)
Normal lead-time is 2-3 business days. For larger orders, approximately 2-3 weeks.


Datasheet (S300)
Datasheet (S400)
Datasheet (S500)
Manual (S-Series Switches)


Related Products

F200 - Digital Air Velocity
& Air Temperature Sensor
F-Series Probe - Air Velocity & Temperature Sensor
F-Series Remote Head -
Air Velocity & Temperature
B-Series - Bi-Directional
Air Velocity & Temperature
FH400 - Air Velocity, Temperature, & Humidity