Dwyer Instruments 45118 Specifications-installation And Operating Instructions

Model 45118 Pocket Wind Meter

Specifications - Installation and Operating Instructions

Bulletin 45118

THIS COMPONENT IS

ON VENDOR MODEL

Measure wind speed, temperature, and windchill accurately
with the Model 45118 Pocket Wind Meter. The rotating vane anemome­ter is constructed with a light weight, sturdy plastic impeller which
spins on high precision jewel bearings. The impeller assembly is easi­ly replaceable in the event of damage or wear. Wind speed, average
wind speed, maximum wind speed, temperature, and windchill can
quickly be viewed on the 4 digit LCD display in user selectable mea­suring units. The 45118 also features automatic shut-off, data hold,
detailed instruction manual, protective plastic housing, tripod-mount­ing connection, and a water resistant housing that floats. Accessories
include a spare battery and a 43˝ lanyard.

FRONT PANEL DESCRIPTION

9

1

6

2

3

4

5

6

8

7

1. Vane impeller

2. Precision thermistor

3. LCD display

4. POWER and HOLD key

5. UNITS and MODE key

7. Swivel handle and storage
case

8. Lanyard holder

9. Impeller set screw (on rear of
meter)

6. Battery compartment (on
rear)

1-45/64

(43.2)

45158 ONLY

9-3/16

(233.4)

1-55/64

(47)

21/32
(24.6)

THIS COMPONENT IS
ON VENDOR MODEL
45158 ONLY

SPECIFICATIONS

Air Velocity Range: 100 to 5500 ft/min, 0.5 to 28 m/s, 2 to 100

km/h, 1 to 62 mph, 1 to 54.3 knots, 1 to 17 Beaufort.
Temperature/Windchill Ranges: 0 to 122°F (0.1°)/-18 to 50°C

(0.1°).

Accuracy:

Wind speed: ±3% of reading.
Temperature: ±1.8°F/±1°C.
Relative Humidity: ±5% RH.

Air Velocity Units: m/s; mph; knots; km/hr; ft/min; Beaufort.
Resolution: 0.2 mph.

Sample Time: 1 reading per second.
Averaging: 5, 10, or 13 second intervals.

Water-resistant: to 3 ft (1 meter).
Wind Speed: Limits: 0.5 to 89 mph.
Power: Lithium battery (CR-2032 or equivalent) 400 hour life

expectancy, replaceable.

Auto-off: 30 minutes after last key is pressed.
Impeller: Plastic, replaceable.
Case: Plastic.
Weight: 3 oz (95 g).
Agency Approval: CE.

Range Specifications:

Measurement

mph (miles/hour)
Km/hr (kilometers/hour)
Knots (nautical miles/hour)
m/sec (meters/second)
ft/min (feet/minute)
Beaufort force
Temperature

Range

1.1 to 62.5 mph

1.8 to 100.6 km/h

1.0 to 54.3 knots

0.5 to 28 m/s
100 to 5500 ft/min
1 to 17
0 to 122°F

-18 to 50°C

Resolution

0.2 mph

0.7 km/h

0.3 knots

0.1 m/s
20 ft/min
1 BF

0.1°F

0.1°C

±(3%rdg+0.4mph)
±(3%rdg+1.4km/h)
±(3%rdg+0.6knots)
±(3%rdg+0.2m/s)
±(3%rdg+40ft/min)
±1
±1.8°F
±1°C

Accuracy

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]

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 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 r eturn to normal operation, release the key and restart the
meter.

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 Thermo­Anemometer and the companion receiver, no routine maintenance
is required. A periodic check of the system calibration is recom­mended. 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

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 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 r eturn to normal operation press the UNITS/MODE key repeat­edly 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 temper­ature 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 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 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.

Rectangular Duct Circular Duct

H

R

W

A = W x H

A = pi x R

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

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

Beaufort Conversion Table

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

0.3-1.5

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

2

mph

2.24

0.01138

1.1523

0.6222
1

0-0.2

©Copyright 2005 Dwyer Instruments, Inc. Printed in U.S.A. 8/05

DWYER INSTRUMENTS, INC.

Phone: [phone] www.dwyer-inst.com

P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A. Fax: [phone] e-mail: [e-mail]