English User's Manual

Select the desired units for air velocity and temperature by momentarily
pressing the UNITS/MODE key from a powered down condition. The LCD
will show temperature units (oC or oF) and Air Velocity units. Press the
UNITS/MODE key repeatedly until the desired units are displaying. When
finished, press the ON/OFF/HOLD key momentarily to restart the meter
with the desired units.
Power the meter by pressing the ON/OFF/HOLD key momentarily. The
Dual Display will illuminate. The top (larger) display indicates air speed and
the lower display indicates temperature.
Position the meter so that the measured airflow enters the meter vane
from the rear of the meter (opposite side from the front panel logo, part
number, etc.).
Activate Data Hold (to freeze the most recent display), by pressing and
holding the ON/OFF/HOLD key while taking measurements. To return to
normal operation, release the key and restart the meter.
Max operation: After a measurement session, press and hold the UNITS /
MODE key until the MAX icon appears on the lower left-hand side of the
LCD. Both the Air Velocity and Temperature indication will represent the
highest readings measured since the meter was last powered.
Average mode operation: Normally the meter averages readings every 2
seconds. To select 5, 10 or 13 second averaging, first press and hold the
UNITS/MODE key until the MAX icon appears. Next, press the key again
momentarily and the AVG icon will appear. The 13 second average mode
is selected. Now press the key again and the number 5 will appear. Leave
it there if an average of 5 seconds is desired. Press the key once more for
a 10 second average mode. To return to normal operation press the
UNITS/MODE key repeatedly until all lower left-hand icons disappear.
Wind chill indicator: Press and hold the UNITS/MODE key until the MAX
icon appears. Press the key repeatedly until the WCI icon appears. The
temperature display will now factor in the wind chill. To return to normal
operation, press the UNITS/MODE key again and the WCI icon will
AUTO POWER OFF: After approx. 15 mins, if meter keys are not touched,
the meter automatically shuts down to preserve battery life.
Congratulations on your purchase of Extech’s 45118 Mini ThermoAnemometer. This meter is shipped fully tested and calibrated and, with
proper use, will provide years of reliable service
UNITS and MODE key
Battery compartment (on
Swivel handle and storage
Lanyard holder
Impeller set screw (on rear
of meter)
-18 to 50oC
Beaufort force
1 BF
100 to 5500 ft/min
ft/min (feet per
0.01 m/s
0.50 to 28.00 m/s
m/sec (meters
per second)
0.3 knots
0.7 km/h
0 to 122oF
1.0 to 54.3 knots
Knots (nautical
miles per hour)
0.2 MPH
1 to 17 BF
1.8 to 100.6 km/h
km/hr (kilometers
per hour)
1.1 to 62.5 MPH
MPH (Miles per
2.2 Electrical Specifications
± (3%rdg +40ft/min)
± (3%rdg +0.2m/s)
± (3%rdg +0.6knots)
± (3%rdg +1.4km/h)
± (3%rdg +0.4MPH)
To replace the impeller, remove the set screw next to the impeller
assembly (on the rear of the meter). Twist the impeller assembly
counter-clockwise to the "O" (open) position and remove it.
Install the new impeller by inserting and twisting the new impeller
assembly clockwise then tighten the set screw.
Copyright © 2011 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.
45118-EU-EN-V4.3 3/11
CMM (m /min) = Air Velocity (m/sec) x Area (m ) x 60
CFM (ft /min) = Air Velocity (ft/min) x Area (ft )
Measure the area of the duct using the diagrams below for rectangular and circular ducts (If the
duct measurements are made in inches, divide the inches by 144 to get the area in square
feet). Plug the area value (in square feet) in the cubic equations below. Note that the air
velocity must be plugged into the cubic equations also.
CFM Measurements
Vane Impeller Replacement
NOTE: The anemometer is very accurate at low and mid-range air speeds.
Constant use at very high speeds may damage the impeller’s bearing and
reduce over-all accuracy.
Disposal: Follow the valid legal stipulations in respect of the
disposal of the device at the end of its lifecycle
You, as the end user, are legally bound (EU Battery ordinance)
to return all used batteries, disposal in the household garbage
is prohibited! You can hand over your used batteries /
accumulators at collection points in your community or wherever
batteries / accumulators are sold!
Battery Replacement
If the meter will not power up as usual or the display contrast becomes weak
and difficult to read, replace the lithium battery. To do so, turn the battery
compartment cover in a CLOCKWISE direction to remove it. The battery will
be visible in the battery compartment, observe the position of the battery and
replace the new one in the same position. Affix the battery compartment
cover by turning it in a COUNTER-CLOCKWISE direction. Dispose of the
lithium battery in accordance with local, state, or national waste disposal
Mini Thermo-Anemometer
Dual LCD with multifunction indicators
Knots, km/h, MPH, ft/min, m/sec, Beaufort force,
windchill, and temperature (C/F)
Moving 2 second average with 2 second gust detect
Sapphire bearing, non-corrosive vane for air velocity
and precision thermistor for temperature
Average Mode
Choice of 5, 10, or 13 second average readings
Max Display
Push button highest reading recall
Data hold
Freeze most recent display
Sample time
1 reading per second
To 1 meter (3’)
Min/Max wind-speed
1.1 to 62.5 MPH
Operating temperature -15 to 50oC (5 to 122oF)
Operating humidity
< 80% RH
Power supply
Lithium battery type CR-2032 or equivalent
Battery life
400 hours approx.
95 g (3 oz)
Instrument: 133 x 70 x 19mm (5.25 x 2.75 x 0.75”)
Vane: 24mm (1”) diameter
LCD display
POWER and HOLD key
Vane impeller
Precision thermister
Meter Description
User Manual Model 45118