Dwyer A-151 Air Velocity Transmitters Owner’s Manual

: June 10, 2024
: Dwyer

Table of Contents

Dwyer A-151 Air Velocity Transmitters
Product Information
- Product Specifications
Product Usage Instructions
BENEFITS/FEATURES
APPLICATIONS
MODEL CHART
SPECIFICATIONS
Dimension
ACCESSORIES
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Dwyer A-151 Air Velocity Transmitters

Dwyer-A-151-Air-Velocity-Transmitters-product

Product Information

Air Quality Series AVUL
The Air Quality Series AVUL is a range of air velocity transmitters that measure air velocity and provide accurate readings. The product comes with a limited warranty of one year.

Product Specifications

Accuracy: 5 conditions
Mounting: Duct mount
Output: Analog universal (0-5 VDC, 0-10 VDC, 4-20mA) or Analog + BACnet MS/TP

Model Chart
The model chart provides information on the different configurations available for the AVUL series:

Model	Description
AVUL-3DA1-LCD	Air velocity transmitter with LCD display, analog universal

output, and factory calibration certificate

Accessories

The AVUL series comes with several accessories:

A-151 Cable gland for 5 to 10 mm diameter cable
A-435-A Remote display tool
A-AVUL-LCD Field upgradeable display
A-AVUL-MTG Replacement mounting flange
SCD-PS 100-240 VAC/VDC to 24 VDC power supply

Product Usage Instructions

To use the AVUL air velocity transmitter:

Choose the appropriate AVUL model based on your requirements.
Mount the transmitter in the duct using the A-AVUL-MTG replacement mounting flange.
Connect the transmitter to power using the SCD-PS power supply.
Connect the transmitter to a display or monitoring system using the appropriate output option.
Calibrate the transmitter if required using the factory calibration certificate.

The Series AVUL Air Velocity Transmitters quickly and accurately measure air velocity or volumetric flow in imperial or metric units. Simultaneous current and voltage outputs on all models provide universal inputs to monitoring equipment while the output range, units, and 0 to 5/10 VDC, 4-20 mA output can be configured via local DIP switches. The optional integral display, or the portable remote display tool, provides a convenient way to locally monitor process values and configure the unit.

Models are available in 3% and 5% of reading accuracy models to suit a variety of needs, and the optional BACnet MS/TP or Modbus® RTU/ASCII communication protocol allows units to be daisy-chained while providing access to all of the velocity and flow data, as well as additional information such as air temperature.

BENEFITS/FEATURES

Minimal preventative maintenance as the sensing element is covered with an engineered protective coating
Easy field setup via the onboard dip switches for range and units

APPLICATIONS

VAV systems
Building ducts
HVAC systems

MODEL CHART

Example| AVUL| -3| D| A1| -LCD| AVUL-3DA1- LCD
Model| AVUL| | | | | Air velocity transmitter
Accuracy| | 5| | | | ±(0.2 m/s + 5% of reading) @ standard
| | conditions
| 3| ±(0.2 m/s + 3% of reading) @ standard
| | conditions
Mounting| | | D| | | Duct mount
Output| | | | A1| | Analog universal (0-5 VDC, 0-10 VDC, 4-20
| | mA)
| B1| Analog + BACnet MS/TP
| M1| Analog + Modbus® RTU/ASCII
Options| | | | | FC| Factory calibration certificate
| GLD| Electrical cable gland
| LCD| LCD display
| NIST| NIST certificate
| SF| Silicone free

SPECIFICATIONS

Service: Clean air and non-combustible, compatible gases.
Wetted Materials: Consult factory.
Range: 1000, 2000, 3000, 4000 FPM (5, 10, 15, 20 m/s); Field selectable.
Accuracy: ±(5% of reading + 0.2 m/s) or ±(3% of reading + 0.2 m/s) @ standard conditions, depending on model.
Temperature Limits: 32 to 122°F (0 to 50°C).
Power Requirements: 24 VDC ±20% or 24 VAC ±20%.
Humidity Limits: 5 to 95% RH, non-condensing.
Output Signals: 4-20 mA, 0-5 VDC, 0-10 VDC.
Response Time (90%): 10 s, typical.
Zero and Span Adjustments: Digital push-buttons.
Output Load Resistance:
- Current output: 0 to 1100 Ω max.;
- Voltage output: Minimum load resistance 1 k Ω.
Current Consumption: 60 mA max.
Display (optional): 5-digit LCD.
Electrical Connections (Analog): Power and output: 4-wire removable European style terminal block for 16 to 26 AWG.
Communication (optional): Connections: BACnet MS/TP or Modbus® RTU/ASCII: 3-wire removable European style terminal block for 16 to 26 AWG; Supported baud rates: 9600, 19200, 38400, 57600, 76800, 115200.
Device Load: 1/8th unit load.
Electrical Entry: 1/2˝ NPS thread. Accessory (A-151): Cable gland for 5 to 10 mm diameter cable.
Enclosure Rating: NEMA 4X (IP66).
Mounting Orientation: Flow direction must be parallel to the sensor tip.
Weight: 6.0 oz (160 g).
Compliance: BTL, CE.