Dwyer instruments, inc – Dwyer AVUB User Manual

Page 2

Duct Details
The Series AVUB Air Velocity Transmitter will achieve its stated accuracy
when mounted in a long straight circular duct with the sensing elements
0.242 radius in from the duct wall and the view through the large holes
parallel to the flow direction (the flow at a point 0.242 radius in from the wall
is close to the average flow through the whole duct section for a wide range
of flows).

It is recommended that the unit be mounted at least 6.6 feet (2 meters)
downstream of any heating or cooling devices and at least 6 duct-
diameters downstream of any bends or other flow disturbances. Deviation
from ideal mounting is likely to reduce stability and accuracy but should not
affect repeatability. In many HVAC applications, simply screwing directly to
the duct and sealing with the gasket supplied will suffice.

MOUNTING HOLE DETAILS

CONNECTION DIAGRAM

MAINTENANCE
The transmitter may read low if the sensing elements are very dirty. To
clean the sensing elements, disconnect the transmitter from power and dip
the end of the probe in water and swirl around. If necessary, use detergent
but do not apply force to the elements. Rinse and allow to dry thoroughly
before reconnecting power.

The body is dustproof and should not need cleaning. If cosmetic cleaning
is required, use a damp cloth with water or isopropyl alcohol.

The Series AVUB Air Velocity Transmitters are not field repairable and
should be returned if repair is needed (field repair should not be attempted
and may void warranty). Be sure to include a brief description of the
problem plus any relevant application notes. Contact customer service to
receive a return goods authorization number before shipping.

Output 0 to 10V

0 V

24 VAC or DC

For 0 to 10 VDC output versions

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000

www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.

Fax: 219/872-9057

e-mail: [email protected]

Printed in U.S.A. 4/14

FR# R8-443850-00 Rev. 1