©Copyright 2005 Dwyer Instruments, Inc. Printed in U.S.A. 8/05
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
OPERATION
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 (°C or °F) 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 desired
units.
Power the meter by pressing the ON/OFF/HOLD key momentari-
ly. 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.
Maximum 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 repre-
sent the highest readings measured since the meter was last pow-
ered.
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 num-
ber 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 repeat-
edly until all lower left-hand icons disappear.
Windchill Indicator:
Press and hold the UNITS/MODE key until the MAX icon appears.
Press the key repeatedly until the WCI icon appears. The temper-
ature display will now factor in the windchill. To return to normal
operation, press the UNITS/MODE key again and the WCI icon will
disappear.
Auto Power Off:
After approximately 20 minutes, if meter keys are not touched, the
meter automatically shuts down to preserve battery life.
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 com-
partment, 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 codes.
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.
To replace impeller, remove the set screw next to the impeller
assembly (on the rear or 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 screw.
MAINTENANCE
Upon final installation of the Model 45118 Mini Thermo-
Anemometer and the companion receiver, no routine maintenance
is required. A periodic check of the system calibration is recom-
mended. The Model 45118 is not field serviceable and should be
returned if repair is needed (field repair should not be attempted
and may void warranty). Be sure to include a brief description of
the problem plus any relevant application notes. Contact customer
service to receive a return goods authorization number before
shipping.
USEFUL EQUATIONS AND CONVERSIONS
Area Equations
Cubic Equations
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60
Units Conversion Table
Beaufort Conversion Table
1 m/s=
1 ft/min=
1 knot=
1 km/h=
1 MPH=
m/s
1
0.00508
0.5144
0.2778
0.4464
ft/min
196.87
1
101.27
54.69
87.89
knots
1.944
0.00987
1
0.54
0.8679
Km/h
3.6
0.01829
1.8519
1
1.6071
mph
2.24
0.01138
1.1523
0.6222
1
Beaufort
0
1
2
3
4
5
6
7
8
9
10
11
12 (-17)
Km/h
<1
1-5
6-11
12-19
20-28
29-38
39-49
50-61
62-74
75-88
89-102
103-117
above 117
mph
<1
1-3
4-7
8-12
13-18
19-24
25-31
32-38
39-46
47-54
55-63
64-72
above 72
Knots
<1
1-3
4-6
7-10
11-16
17-21
22-27
28-33
34-40
41-47
48-55
56-63
above 63
Meter/Sec
0-0.2
0.3-1.5
1.6-3.3
3.4-5.4
5.5-7.9
8.0-10.7
10.8-13.8
13.9-17.1
17.2-20.7
20.8-24.4
24.5-28.4
28.5-32.6
above 32.6
W
HR
Rectangular Duct Circular Duct
A = W x H A = pi x R2
Model 45118 8/5/05 11:19 AM Page 2
