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
/
2
minutes
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: [email protected]
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 2
1
/
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: 6
9
⁄
16
″
H x 2
13
⁄
16
″
W x
29
⁄
32
″
D (166 x 71 x 23 mm).
Weight, Battery Included: 12 ounces (340 grams).
Carrying Case: 2
3
⁄
8
″
H x 13
1
⁄
2
″
W x 10
1
⁄
2
″
D
(60 x 343 x 267 mm).
Velocity,
FPM
Range
Number
1
2
3
4
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.
*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
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