Extech Instruments 45158 User manual

User's Manual

Model 45158

Mini Hygro Thermo-Anemometer

Introduction

Congratulations on your purchase of Extech’s

Model 45158 Anemometer. The dual display

indicates Air Velocity and Humidity, Dew Point,

Ambient Temperature, or Temperature with

wind-chill factor. With careful use, this meter

will provide years of reliable service.

Specifications

Range Specifications

Measurement Range Resolution Accuracy (% of reading)

MPH (Miles per hour) 1.1 to 62.5 MPH 0.2 MPH ± (3% + 0.4 mph)

km/hr (kilometers per hour) 1.8 to 100.6 km/h 0.7 km/h ± (3% + 1.4 km/hr)

Knots (nautical miles per hour) 1.0 to 54.3 knots 0.3 knots ± (3% + 0.6 knots)

m/sec (meters per second) 0.50 to 28.00 m/s 0.01 m/s ± (3% + 0.2 m/s)

ft/min (feet per minute) 100 to 5500 ft/min 20ft/min ± (3% + 40 ft/min)

Beaufort force 1 to 17 BF 1 BF ± 1

Temperature 0 to 122oF (-18 to 50oC) 0.1oF/C ± 1.8oF (± 1oC)

Relative Humidity 10 to 95% 1% ± 5% RH

Dew Point 32 to 122oF (0 to 50oC) 0.1oF/C ± 3.6oF (2oC)

General Specifications

Display Dual LCD with low battery and multifunction indicators

Sensors Sapphire bearing, non-corrosive vane for air velocity; Precision

thermistor for temperature measurements

Average Mode Choice of 5 or 10 reading averaging (2 second factory default)

Max and Data Hold Displays Max recalls the highest reading; Data Hold freezes the display

Sample time 1 reading per second for air velocity and temperature

(1 reading per 15 seconds for humidity with 2 second updates)

Water-resistant To 3’ (1m)

Operating conditions 5 to 122oF (-15 to 50oC) / < 80% RH

Power supply Lithium battery (CR-2032 or equivalent) / 400 hour battery life

Dimensions / Weight Instrument: 5.25 x 2.75 x 0.75” (133 x 70 x 19mm)

Vane: 1” ( 24mm ) diameter / 3 oz. ( 95 g )

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

99 Washington Street

Melrose, MA 02176

Phone 781-665-1400

Toll Free 1-800-517-8431

Visit us at www.TestEquipmentDepot.com

Back to the 45158 Product Info Page

Model 45158 - Version 1.8 - May 2003

Meter Description

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)

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 (oF/oC), Humidity (RH%), Dew Point (TD), &

Temperature with wind-chill 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 (oC or oF)

•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 averaging 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



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: [email protected]

Website: www.extech.com

CFM Measurements

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.

Height r

Width

Cubic Equations: CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)

CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60

Maintenance

Battery Replacement

The 45158 has a low battery indicator (battery symbol). Important: Turn the meter off

before opening the battery compartment. Using a coin, turn the battery compartment cover

CLOCKWISE to remove it. Once opened, observe the position of the battery, placing the

new one in the same position. Secure the battery compartment cover and dispose of the

lithium battery in accordance with local, state, or national disposal codes.

Impeller Replacement

•Remove the set screw next to the impeller assembly (on the rear of the meter).

•Twist the impeller assembly counter-clockwise to the OPEN position and remove it.

•Install impeller by inserting & twisting the new impeller assembly clockwise

•Tighten the set screw.

Calibration and Repair Services

Extech offers complete repair and calibration services for all of the products we sell. For

periodic calibration, NIST certification or repair of any Extech product, call customer

service for details on services available. Extech recommends that calibration be performed

on an annual basis to insure calibration integrity.

For rectangular

ducts, multiply the

Height x Width

For circular ducts measure

the radius (r), square the

radius and multiply the

radius by π(3.14)

A = πr2(or A = 3.14 x r x r)

Model 45158 - Version 1.8 - May 2003

Unit of Measure Conversion Tables

Units Conversion Table

m/s ft/min Knots km/h MPH

1 m/s = 1196.87 1.944 3.6 2.24

1 ft/min = 0.00508 10.00987 0.01829 0.01138

1 knot = 0.5144 101.27 11.8519 1.1523

1 km/h = 0.2778 54.69 0.54 10.6222

1 MPH = 0.4464 87.89 0.8679 1.6071 1

Beaufort Conversion Table

Beaufort Km / Hour MPH Knots Meter/Sec

0 <1 <1 <1 0-0.2

1 1-5 1-3 1-3 0.3-1.5

2 6-11 4-7 4-6 1.6-3.3

3 12-19 8-12 7-10 3.4-5.4

4 20-28 13-18 11-16 5.5-7.9

5 29-38 19-24 17-21 8.0-10.7

6 39-49 25-31 22-27 10.8-13.8

7 50-61 32-38 28-33 13.9-17.1

8 62-74 39-46 34-40 17.2-20.7

9 75-88 47-54 41-47 20.8-24.4

10 89-102 55-63 48-55 24.5-28.4

11 103-117 64-72 56-63 28.5-32.6

12 to 17 above 117 above 72 above 63 above 32.6

Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176

FAX 781.665.0780 - TestEquipmentDepot.com

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