Dwyer Instruments 471-2, 471-3, 471-1 Installation And Operating Instructions Manual

Series 471 Digital Thermo Anemometer

Specifications - Installation and Operating Instructions

Introduction

The Series 471 Digital Thermo Anemometers are versatile
dual function hand-held battery operated instruments
that quickly and easily measure air velocity in four field
selectable ranges – feet per minute (FPM) or meters per
second (MPS) – plus air temperature in °F or °C. High
contrast LCD display shows both range selected and
present velocity.
The stainless steel probe (5/16″ dia.) with comfortable hand
grip is etched with insertion depth marks from 0-8 inches
and 0-20 cm on the Model 471-1.
The Model 471-2 and 471-3 probes extend to 33 inches
(83cm). The probe tip on the Model 471-3 is bendable up
to 90 degrees in any direction for easy access in hard-to­reach locations. A 7/16″ (111 mm) hole is required for full
probe insertion. When extending or collapsing the tip, be
sure the connecting cable moves freely through the
opening at the base of the handle. For optimum accura­cy, be sure to extend the tip a minimum of 2
for all measurements.
Also note that with all models the two openings in the tip
must be parallel to air flow for best accuracy. A conve­nient way to assure proper alignment when tip is out of
view (such as inside a duct) is to note the orientation rel­ative to the handle before insertion.

Battery Installation

To install the 9 volt alkaline battery, first remove the two
screws and end cap at the bottom of unit. Attach the bat­tery clip to the battery and place it inside the case. Be
careful not to pinch wires when putting battery in place.
Replace cover and sealing gasket. If wrist strap will be
used, install “Z” shaped clip under one of the screw
heads before securing. Do not overtighten screws. Snap
wrist strap to the clip.

1

/2″ (6.36 cm)

Bulletin H-17-A

PHYSICAL DATA

Specified Accuracy Temperature Limits:

59 to 86°F (15-30°C). Outside this range add 0.11% per °F
(0.2% per °C).

Flow Temperature Range: 32-200°F, 0-100°C.

TEMPERATURE MEASUREMENT: 0 to 200°F, -17 to 100°C

Temperature Accuracy: ±2°F, 1°C.
Resolution: 0.1°
Ambient Temperature Limits: 32 to 104°F, 0-40°C.
Storage Temperature Limits: -40 to 176°F, -40 to 80°C.
Probe:

and 6 ft. [15.2 cm] coiled cord.
Length of probe: Model 471-1=10″ [25.4 cm]; Models 471-2
and 471-3= 33″ [83 cm].

Power Source: 9 volt alkaline battery, included.
Housing Size: 6
Weight, Battery Included: 12 ounces (340 grams).
Carrying Case: 2

(60 x 343 x 267 mm).

5

⁄16″ [8.13 mm] diameter probe with integral hand grip

9

⁄16″H x 213⁄16″W x 29⁄32″D (166 x 71 x 23 mm).

3

⁄8″H x 131⁄2″W x 101⁄2″D

Air Velocity Ranges

Range

Number

1
2
3
4

*Temperature Range for velocity accuracy specified is 59 to 86°F (15 to
30°C). Outside this range add 0.11% per °F (0.2% per °C).

On-Off Operation

The on-off control is a toggle function. Press the
ON/OFF key once to turn unit on and again to turn it off.
If the Series 471 is left on for approximately 2 1/2minutes
with no activity, the device will turn off automatically to
conserve battery life.

Display Backlight

The Series 471 includes a standard backlight display to
improve visibility under poor lighting conditions. The
instrument must first be switched off before this feature
can be activated. Next, press and hold the ON/OFF key
down. After about 1 second, the backlight will switch on
and remain lighted for approximately 2 minutes. It will
then automatically shut off to conserve battery life.

Selecting Velocity or Temperature Measurement

To switch between velocity and temperature measure­ment, press the VELOCITY/TEMP key.

Velocity,

FPM

0-500
0-1500
0-5000

0-15000

Velocity,

MPS

0-3.0
0-7.0

0-30
0-70

Accuracy*

±3% F.S.
±3% F.S.
±4% F.S.
±5% F.S.

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

Series 471 Digital Thermo Anemometer

Specifications - Installation and Operating Instructions

Bulletin H-17-A

Page 2

Selecting Units of Measurement

The Series 471 will display velocity or temperature in
either English or metric units. Velocity can be expressed
in your choice of feet per minute (FPM) or meters per
second (MPS). Temperature can be indicated in either °F
or °C. Currently selected units will be indicated on the
display. To change units press the UNITS key. Units
selected will remain in memory even when power is shut
off.

Selecting Velocity Range

Four velocity ranges can be selected in either English or
metric units. Choose a range where typical readings fall
within the center to upper portion of the span. The range
selected will be shown in smaller characters in the lower
left corner of the display. To change ranges, press the
RANGE key until the required one is shown. Each time
the range is changed, the display velocity will momentar­ily read zero until the sensor stabilizes with the new
range.

Low Battery Indicator

A weak battery can cause improper operation and/or
inaccurate measurements. A low battery indicator is
included on the display to warn when the battery needs

to be replaced. Although the unit might appear to operate
and indicate properly, accuracy of readings cannot be
assured when the LO BAT indicator is displayed. Replace
the exhausted battery with a fresh alkaline type such as
Duracell

®

MN1604, Eveready®522 or equivalent. Zinc car­bon types are not recommended because of their signifi­cantly shorter life and increased potential for leakage. Do
not leave exhausted batteries in the unit due to possible
leakage and resulting damage.

Probe Care and Cleaning

Always cover the tip when not in use by fully collapsing
the telescoping sections or sliding up the cover attached
to the 471-1. Use only clean, dry particulate free air.
Although probe requires little maintenance, occasional
cleaning may be necessary for best accuracy.
Caution: Tip is fragile and must not be touched. Do not
use brushes, cotton swabs, etc. to clean. Remove battery
before cleaning. Provide adequate ventilation and gently
bathe the probe tip in a small container of denatured alco­hol. Wash briefly, avoiding extended soaking. Remove
from bath and gently shake off excess. Allow to com­pletely air dry before replacing battery and returning to
service. Do not use pressurized cleaners or compressed
air, both of which could cause permanent damage.

Duracell® is a registered trademark of The Gillette Company.
Eveready® is a registered trademark of the Eveready Battery Company,
Inc.

©Copyright 2009 Dwyer Instruments, Inc. Printed in U.S.A. 7/09 FR#440918-01 Rev. 1

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]