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Series-AVU
HVAC Air Velocity Transmitter – Accurate, Drift Resistant, Zone Control
- 4 to 20 mA or 0 to 10 V output versions
- NEMA 6 (IP67) enclosure rating
- AC or DC powered (loop version DC only)
- 5% or 8% accuracy
Product Overview
- Accuracy ± 5 %
- Air Velocity, Min 0 FPM
- Applications Building and Maintenance, HVAC
- Baud Rate N/A
- Data Interface N/A
- Display Type N/A
- Electrical Connection Cable Gland for 4 to 8 mm Wire with Screw Terminal block
- Enclosure Ratings IP67, NEMA Type 6
- Enclosure Ratings Note NEMA 6 (IP67) Except Sensing Point
- Inrush Current 85 mA; 10 V
- Load Resistance 700 Ω
- Media Compatibility Clean dry air / inert gas, Inert / non-reactive gases, Clean Dry Air, Helium, Nitrogen, Non-Corrosive Dry Gases
- Mounting Orientation None
- Number of Digits N/A
- Operating Temperature, Max 122 °F
- Operating Temperature, Min 32 °F
- Output Detail 4 to 20 mA
- Power Consumption 60 mA + Output Current
- Probe Diameter 0.75 in
- Probe Length 9.45 in
- Relative Humidity 0 to 90% RH Non-Condensing
- Response Time 5 s @ 90%
- Series ID Series-AVU
- Supply Power Type DC
- Supply Voltage 20 to 26 Vdc
- Weight 8.8 oz
- Wire Gauge 16 AWG
Supported Applications
The Dwyer Series AVU and AVUB Air Velocity Transmitters are designed for measuring air velocity within ducts. A typical application is in VAV (Variable Air Volume) air conditioning systems, where the transmitters provide linear outputs suitable for HVAC management and control applications, including complete building control and energy management systems.
Operating Conditions & Performance
The series operates by measuring heat loss from sensing elements clad in metal to calculate air velocity. This design provides excellent immunity to drift across the measurement range. The transmitters are suitable for service with clean air and compatible, non-combustible gases.
- Measurement Ranges: 0 to 785 fpm (0 to 4 m/s), 0 to 1575 fpm (0 to 8 m/s), or 0 to 3150 fpm (0 to 16 m/s).
- Accuracy: ±5% of full-scale for Series AVU models; ±8% of full-scale for Series AVUB models.
- Response Time: 5 sec (typical) at 90% for Series AVU; 10 sec (typical) for Series AVUB.
- Temperature Limits: 32 to 122°F (0 to 50°C).
- Humidity Limit: 0-90% RH, non-condensing.
Configuration Options
The series offers configurable output signals and power requirements depending on the model suffix. The probe dimensions are listed as 9.45 x .75" (240 x 19 mm). Electrical connections utilize a screw terminal with a cable gland for 4-8 mm wire (16 gauge wire).
Output and Power Configurations
- -A Models: Provide a 4 to 20 mA current loop output. These models require 24 VDC +10% -15%. The maximum load resistance is 700 Ω.
- -V Models (Series AVU): Provide a 0 to 10 VDC output. Power requirements are 24 VDC or 24 VAC +10% -15%.
- Series AVUB: Provides a 0 to 10 VDC output with power requirements of 24 VDC or 24 VAC +10% to 15%.
Housing and Approvals
- Enclosure Rating: NEMA 6 (IP67) except sensing point for Series AVU; IP67 except sensing point for Series AVUB. The body is dustproof.
- Agency Approvals: CE certification applies to the series.
Key Product Differences
The primary distinction between product families lies in accuracy and output options. The Series AVU models (AVU-1, AVU-2, AVU-3) offer ±5% of full-scale accuracy with either 4 to 20 mA or 0 to 10 VDC outputs depending on the model suffix (-A or -V). The Series AVUB models (AVUB-1-V, AVUB-2-V, AVUB-3-V) are configured for a 0 to 10 VDC output with ±8% of full-scale accuracy. All units weigh 8.8 oz (250 g) and require the probe to be aligned with airflow during mounting.
