Dwyer Instruments 471-2 Manuale utente

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 measure-

ment, press the VELOCITY/TEMP key.

Series 471 Digital Thermo Anemometer

Specifications - Installation and Operating Instructions

Bulletin H-17-A

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

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-to-

reach 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 accura-

cy, be sure to extend the tip a minimum of 21/2″(6.36 cm)

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 conve-

nient way to assure proper alignment when tip is out of

view (such as inside a duct) is to note the orientation rel-

ative 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 bat-

tery 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.

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: 5⁄16″[8.13 mm] diameter probe with integral hand grip

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: 69⁄16″H x 213⁄16″W x 29⁄32″D (166 x 71 x 23 mm).

Weight, Battery Included: 12 ounces (340 grams).

Carrying Case: 23⁄8″H x 131⁄2″W x 101⁄2″D

(60 x 343 x 267 mm).

Velocity,

FPM

Range

Number

0-500

0-1500

0-5000

0-15000

Velocity,

MPS

0-3.0

0-7.0

0-30

0-70

Accuracy*

±3% F.S.

±4% F.S.

±5% F.S.

*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).

Air Velocity Ranges

H-17:H-17 7/24/09 10:52 AM Page 1

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 momentar-

ily 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

DWYER INSTRUMENTS, INC.

Phone: 219/879-8000 www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: 219/872-9057 e-mail: info@dwyer-inst.com

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 car-

bon types are not recommended because of their signifi-

cantly 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 alco-

hol. Wash briefly, avoiding extended soaking. Remove

from bath and gently shake off excess. Allow to com-

pletely 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.

H-17:H-17 7/24/09 10:52 AM Page 2

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