You are here:
Dwyer 641 Air Velocity Transmitter
Dwyer 641 Air Velocity Transmitter is a high-performance air velocity measurement device designed for accurate monitoring of airflow in HVAC systems, cleanrooms, and industrial ventilation applications. It uses a heated mass flow sensing principle to deliver stable and precise velocity readings across a wide range of airflow conditions.
Looking for a Quote? Contact Us Now
Categories: Air Velocity Meters
Description
The Dwyer 641 Air Velocity Transmitter is engineered to measure air velocity using a thermal dispersion (heated mass flow) sensor that ensures high accuracy and fast response even at low airflow conditions. It supports multiple field-selectable velocity ranges from approximately 250 FPM to 15,000 FPM, making it suitable for diverse applications such as duct airflow monitoring, exhaust systems, and cleanroom ventilation. The transmitter provides a standard 4–20 mA output signal for easy integration with building management systems (BMS), PLCs, and HVAC controllers. Its digital filtering capability helps stabilize readings by reducing signal noise and fluctuations in variable airflow environments.
In addition, the device features a rugged industrial-grade construction with a compact housing designed for easy duct mounting. It supports optional local LED display for real-time airflow indication and allows simple push-button configuration for setup and calibration. With a fast response time of approximately 1.5 seconds and accuracy up to ±3% of full scale, the 641 Series ensures reliable performance in critical airflow monitoring systems. Its compatibility with clean air and non-combustible gases makes it widely used in HVAC, laboratory, and industrial ventilation control applications.
QTech Safety is a leading supplier of Dwyer 641 Air Velocity Transmitter in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Dwyer Instruments Air Velocity Meters from one of Ireland’s most trusted industrial safety equipment suppliers.
Features of Dwyer 641 Air Velocity Transmitter
- Measures air velocity using heated mass flow technology
- Wide range: 250 to 15,000 FPM selectable ranges
- High accuracy up to ±3% of full scale
- Fast response time (~1.5 seconds)
- Standard 4–20 mA output for control systems
- Optional LED display for local indication
- Easy push-button configuration and setup
- Digital filtering for stable signal output
- Compact and industrial-grade rugged design
Technical Specifications of Dwyer 641
- Type: Heated mass flow air velocity transmitter
- Measurement range: 250 to 15,000 FPM (1.25 to 75 m/s)
- Accuracy: ±3% of full scale (typical)
- Output signal: 4–20 mA
- Response time: ~1.5 seconds to 95% of final value
- Operating temperature: 0 to 50 °C (32 to 122 °F) standard operation
- Extended temperature range: -40 to 212 °F (model dependent)
- Media compatibility: Clean air and non-combustible gases (nitrogen, helium, etc.)
- Power supply: 12–35 VDC or 10–16 VAC
- Process connection: 1/2″ NPT male
- Enclosure rating: NEMA 4X / IP66 (model dependent)
- Mounting: Duct-mounted probe design
- Housing material: Industrial-grade aluminum/polymer enclosure
Air Velocity Meters Part Number & Configuration Guide
Standard (Example) Part Number
641-6
This is a reference configuration for the Dwyer Instruments Air Velocity Meters. It represents one commonly supplied setup and helps customers understand how the part number is structured.
Configurable Part Number Format
641-X
Each X / XX in the part number indicates a selectable option that can be customized based on your application requirements such as Accuracy, Output & Display.
✅ Important: Final part number depends on the exact configuration needed for your machinery, environment, and monitoring system.
Applications
The Dwyer 641 Air Velocity Transmitter is commonly used in industrial calibration and testing applications, including:
- HVAC duct airflow monitoring
- VAV (Variable Air Volume) system control
- Building automation systems (BMS)
- Cleanroom ventilation control
- Industrial air handling and exhaust systems
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
