Manual

The Model 471B Digital Thermo Anemometers are versatile dual function
instruments that quickly and easily measure air velocity or volumetric flow plus air
temperature in imperial or metric units. High contrast LCD display shows both
selected readings simultaneously. Convenient backlight provides perfect visibility in
l
ow light conditions. Light automatically shuts off after 2-1/2 minutes to prolong
b
attery life. Low battery warning is included. Stainless steel probe with comfortable
hand grip is etched with insertion depth marks from 0 to 8 inches and 0 to 20 cm.
Extruded aluminum housing fully protects electronics, yet is lightweight and
comfortable to hold even when taking multiple readings as part of duct traverses.
Up to 99 readings may be stored for later retrieval. An integral sliding cover protects
sensors when not in use. Items included with the 471B are 9 volt alkaline battery,
sensing probe, wrist strap and custom carrying case.
Battery Installation
The unit is shipped with a separate 9 volt alkaline battery which must be installed
before operation. Remove the two screws holding the bottom endcap in place and
remove it. Connect the battery to the enclosed battery clip, observing correct
polarity. Be careful not to trap the wires between the case or foam pad which
retains the battery. This could make it difficult to install the battery or remove it later
for replacement. Be sure the rubber gasket is properly seated in the gasket
channel and replace the endcap. Note that the endcap will only fit one way
because the holes are slightly off-center. Place the “Z” shaped wrist strap clip in
one of the screw recesses and replace the screws. Do not overtighten. Attach the
wrist strap to the clip.
When battery replacement becomes necessary, use only 9 volt alkaline type
batteries such as a Duracell
®
MN1604, or Eveready
®
522 or equivalent. Zinc-
carbon types, often labeled Heavy-Duty, are not recommended because of their
shorter life and an increased potential for leakage. Alkaline batteries are a better
value because they last typically up to three times longer in this device.
Low Battery Indicator
A weak battery may cause improper operation or inaccurate measurements. A low
battery indicator ( ) is provided on the display to show when the battery needs
to be replaced. Although the unit may appear to function and read properly, the
accuracy of the readings cannot be guaranteed when the ( ) indicator is empty
of power segments. Replace the battery with a fresh one. Do not leave an
exhausted battery in the unit due to potential battery leakage.
S
PECIFICATIONS
S
ervice: Air velocity and temperature of clean, dry air.
T
emperature Limits:
P
rocess Air Velocity: -20 to 212°F (-29 to 100°C);
Process Temperature: -40 to 212°F (-40 to 100°C);
Ambient: 5 to 125°F (-15 to 51°C).
Display: 4.5 digit LCD.
R
esolution: 0.1%, 0.1°F/°C.
R
ange Air Velocity: 0 to 6000 FPM (0 to 30 m/s).
A
ccuracy Air Velocity: ±3% FS within temperature range of 40 to 90°F (4 to
3
2°C).
Range Volumetric Air Flow: 19,999 in selected flow units.
Range Temperature: -40 to 212°F (-40 to 100°C).
Accuracy Temperature: ±0.5°F (±0.28°C) from 32 to 122°F (0 to 50 °C); ±1.5°F
(
±0.83°C) from -40°F to 32°F (-40 to 0°C) & 122 to 212°F (50 to 100°C).
P
robe Length: 8˝ (203 mm) insertion.
C
able Length: 28˝ (71 cm) retracted, 6 ft (183 cm) extended.
Power Requirements: 9V alkaline battery included.
Weight: 16 oz (454 g).
Agency Approvals: CE, RoHS.
Model 471B Digital Thermo Anemometer
Specifications and Operating Instructions
B
ulletin TE-471B
DWYER INSTRUMENTS, INC. Phone: [phone] www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: [phone] e-mail: [e-mail]
OPERATING INSTRUCTIONS
Duracell
®
is a registered trademark of The Gillette Company
Eveready
®
is a registered trademark of Eveready Battery Company, Inc.
The side of the probe with dot should face the flow.
NOTICE