Dwyer Instruments 45158 Specifications-installation And Operating Instructions

Model 45158 Pocket Weather Meter

Specifications - Installation and Operating Instructions

Bulletin 45158

THIS COMPONENT IS

ON VENDOR MODEL

Measure wind speed, temperature, windchill, humidity, dew
point, and % RH with the Model 45158 Pocket Weather Meter.

Measuring modes and display units can be changed at any time. All
functions are controlled with two buttons. The 45158 displays maxi­mum, average, and current wind speed in knots, meters per minute,
and Beaufort scales. Quickly select temperature measurement in °F or
°C. The compact, rugged weather meter is water resistant, and the unit
also features automatic shut-off. Similar to the standard wind meter,
the 45158 also offers 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.

METER DESCRIPTION

1
2

3

4

5

6

7

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/Wind-chill Ranges: 0 to 122°F (0.1°)/-18 to

50°C (0.1°).

Relative Humidity: 10% to 95% (model 45158 only).
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.

10

1. Vane impeller

2. Impeller set screw (on rear
of meter)

3. Relative Humidity sensor

4. Temperature sensor

5. LCD display

6. ON/OFF/HOLD key

7. UNITS/MODE key

8. Battery compartment (on
rear)

9. Tripod mounting hole

10. Lanyard (neckstrap)

DWYER INSTRUMENTS, INC.

8

9

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
Relative Humidity
Dew Point

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)

10 to 95%

32 to 122°F (0 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/C
1%

0.1°F/C

±(3%rdg+0.4 mph)
±(3%rdg+1.4km/h)
±(3%rdg+0.6knots)
±(3%rdg+0.2m/s)
±(3%rdg+40ft/min)
±1
±1.8°F (±1°C)
±5% RH
±3.6°F (±2°C)

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

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

Accuracy

OPERATION
Turning the meter ON and OFF

•Press the ON/OFF/HOLD button to turn the meter ON.

•Press and hold the ON/OFF/HOLD buttons for approx. 3 sec­onds to turn it OFF.

• The meter’s Auto Power OFF feature turns the meter OFF after
10 minutes of inactivity.

Change the lower display parameter

•With the meter ON, press and hold down the ON/OFF/HOLD
button.

•While continuing to hold the ON/OFF/HOLD button, press the
UNITS/MODE button repeatedly to step through Temperature
(°F/°C), Humidity (RH%), Dew Point (TD) & Temperature with
windchill factor (WCI). Note that the center display is Air
Velocity.

Change the Air Velocity unit of measure

•Turn the meter OFF. Press and hold down both buttons until the
display turns on and begins blinking then release both buttons.

•Press the UNITS/MODE button repeatedly to step through the
units (see specs for list).

• After 5 seconds the meter switches back to normal operation
mode automatically.

Select temperature units (°C or °F)

•Turn the meter OFF first. Press and hold down both buttons until
the display turns on and begins blinking then release the but­tons.

•Press both buttons momentarily to change temperature units.

• After 5 seconds the meter switches back to normal operation
mode automatically.

Taking Measurements

• Position the meter so that the airflow enters the meter vane from
the rear of the meter (opposite side of front panel logo). A tripod
mount is located on the bottom of the meter.

Max Hold

•Max Hold represents the highest measurement taken since the
meter was turned on.

•Press the UNITS/MODE button to display the Max reading (MAX
icon appears).

•Press the UNITS/MODE button repeatedly to step through to
the normal operating mode.

Average mode

•5 or 10 reading averages can be displayed in the Average
Mode.

•Press UNITS/MODE 3 times for 5 reading averages or 4 times
for 10 readings.

•To exit this mode, press the UNITS/MODE button until the icons
on the left disappear.

Data Hold

• Data Hold freezes the most recent displayed reading.

•Press and hold the ON/OFF/HOLD button to activate Data Hold.

• As long as the ON/OFF/HOLD button is held the reading will
remain on the LCD.

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 r eplace 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 45158 Mini Thermo­Anemometer and the companion receiver, no routine maintenance
is required. A periodic check of the system calibration is recom­mended. The Model 45158 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.

CFM MEASUREMENTS

Measure the duct area using the diagrams that follow (use inches
rather than feet when calculating the area). Plug the area value, in
inches, into the cubic equations below. Note that the air velocity
must be plugged into the cubic equations also.

Rectangular Duct Circular Duct

H

R

W

A = W x H

A = pi x R

2

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

mph

2.24

0.01138

1.1523

0.6222
1

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

0-0.2

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

©Copyright 2005 Dwyer Instruments, Inc. Printed in U.S.A.7/05

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]