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INTRODUCTION

The Air Flow and Velocity Transmitter series is 

intended for use in commercial environments. It is 

designed with a duct mount probe and adjustable 

collar suitable for round or rectangular ducts. 

The transmitter provides separate readings for 

air velocity and temperature. It comes with three 

measurement ranges in a single device (0–2 m/s, 

0–10 m/s, 0–20 m/s) and is available with optional 

display and relay.

BEFORE INSTALLATION

Read these instructions carefully before attempting to install, operate or service this device. 

Failure to 

observe safety information and comply with instructions can result in personal injury, death and/

or property damage.

 Disconnect power before installing or servicing device and only use wiring with 

insulation rated for full device operating voltage. 

Not for use in flammable or explosive environments.

MOUNTING

The transmitter should be mounted in an easily accessible location in a straight section of duct at least 

five feet from corners or other items that may cause disturbances in the air flow. Avoid areas where the 

detector is exposed to vibrations or rapid temperature changes.

Once a suitable location is selected, use the mounting flange as a template and mark the locations of the 

two screws needed to mount the transmitter. Pre-drill the holes in the duct and mount the flange with 

screws (not included). See Figure 1.

Adjust the probe to the desired depth. Ensure that the end of the probe reaches the middle of the duct. 

Tighten the screws on the flange to hold the probe in position. See Figure 2.

For proper mounting orientation in relation to air flow direction, see Figure 3.

WIRING

For CE compliance a properly grounded shielding cable is required. Unscrew the strain relief and route the 

cable(s). Use the strain relief on the left for power in and signal out. Connect the wires as shown in Figure 

4 and then tighten the strain relief.

Select the desired measurement range by 

installing the jumpers as shown in Figure 5.

To configure the temperature output (Tout) and 

velocity output (Vout) select the output mode, 

current (mA) or voltage (V), by installing the 

jumpers as shown in Figure 6. Both output types 

are configured separately.

To configure the switching point (display required) 

install a jumper to pins labeled sw.p. (switching 

point) as shown in Figure 7. Press down on the 

Figure 1

Figure 3

Figure 2

Tighten screws

Insert probe

IN-GE-AVDTXXX-01 03/20

Copyright © Greystone Energy Systems, Inc.   All Rights Reserved    Phone:  +1 506 853 3057  Web: www.greystoneenergy.com

Air Flow and Velocity  

Transmitter

AVDT Series - Installation Instructions

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