Dwyer Instruments AVFS-1 | Thermo air flow switch | 80-250 AC/DC.
A mains-powered thermal air flow switch for duct monitoring, accepting 80–250 V AC/DC and covering air velocities from 197–1969 FPM (1–10 m/s), with red and green LED status indicators.
Request a quote in under a minute — call +971 6 5436933.
Part No.: AVFS-1
Product Description
The Dwyer AVFS-1 Thermo Air Flow Switch is designed for duct air flow monitoring in HVAC and other air-handling applications where a mains-range power supply is required. It accepts 80–250 V AC or DC power, eliminating the need for a separate 24 VDC supply.
The AVFS-1 uses a thermal sensing element with a titanium sensor housed in a durable PBT body. It measures air velocities from 197 to 1969 FPM (1–10 m/s) and provides ±5% set-point repeatability for reliable flow monitoring.
Red and green LED indicators provide convenient visual status information, allowing technicians to check the unit's operating and flow status at a glance without opening the control panel.
The switch provides a 3 A N.O. SPST contact output and responds to flow loss within approximately 3–60 seconds. Its IP65-rated enclosure, PBT housing, and titanium sensor make it suitable for typical duct environments.
The AVFS-1 is supplied with a mounting bracket and 2 m cable to simplify installation. CE approval further supports its use in standard commercial HVAC applications.
If your system uses a dedicated 24 VDC supply, the Dwyer AVFS-2 may be a suitable alternative. Contact GeneralTech Shop if you need help selecting the appropriate model for your application.
Ready to order the AVFS-1? Speak to our team. Call +971 6 5436933.
Key Benefits
- Operates directly from 80–250 V AC or DC power
- Air velocity range of 197–1969 FPM (1–10 m/s)
- ±5% set-point repeatability
- Red and green LED status indicators for quick visual checks
- 3 A N.O. SPST contact output
- 3–60 second response time to flow changes
- IP65-rated enclosure for protection in typical duct environments
- Titanium sensor with durable PBT housing
- Supplied with mounting bracket and 2 m cable
- CE approved
Who This Product Is Best For
- HVAC controls contractors
- HVAC installation and maintenance teams
- Building management and facility maintenance teams
- Technicians working with duct air flow monitoring systems
- Applications requiring a thermal air flow switch with 80–250 V AC/DC power
How to Use
- Mount the AVFS-1 in the duct using the supplied mounting bracket.
- Connect the 80–250 V AC/DC power supply according to the installation requirements.
- Check the red and green LED indicators to verify the unit's operating and flow status.
- Test the 3 A N.O. SPST contact to confirm that it switches correctly when the monitored air flow changes.
- Verify the response time during commissioning to ensure the switch operates as required for the application.
Frequently Asked Questions
What power supply does the Dwyer AVFS-1 accept?
The AVFS-1 accepts 80–250 V AC or DC power. For AC operation, the specified frequency range is 47–63 Hz.
What is the air velocity range of the AVFS-1?
The AVFS-1 covers an air velocity range of 197–1969 FPM (1–10 m/s).
What do the LED indicators show?
The AVFS-1 has red and green LED indicators that provide at-a-glance information about the unit's operating and flow status.
What is the response time of the AVFS-1?
The contact switches in approximately 3–60 seconds following a flow change.
What type of output does the AVFS-1 provide?
The unit provides a 3 A normally open (N.O.) SPST contact output.
Is the Dwyer AVFS-1 suitable for duct applications?
Yes. The AVFS-1 is designed for thermal air flow monitoring in duct and HVAC applications.
Is the AVFS-1 CE approved?
Yes. The AVFS-1 has CE approval.
What is the difference between the AVFS-1 and AVFS-2?
The AVFS-1 is designed for systems using 80–250 V AC/DC power, while the AVFS-2 is designed for systems using a dedicated 24 VDC supply.
Does GeneralTech Shop deliver the AVFS-1 across the UAE?
Call +971 6 5436933 and our team will confirm delivery availability and timelines for your emirate.
How can I get pricing for the Dwyer AVFS-1?
Pricing is quote-based. Call +971 6 5436933 and our team will confirm the current price and availability.
For pricing or to place an order, contact GeneralTech Shop. Call +971 6 5436933.
