Extech 45158 Operating Manual

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V3.0 03/08

Website: www.extech.com

Support Hotline (781) 890-7440

/min) = Air Velocity (m/sec) x Area (m

/min) = Air Veloci ty (ft/min) x Area (f t

CMM (m

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

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

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

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

• 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

Impeller Replacement

• Tighten the set screw.

CFM Measur e m en t s

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

Maintenance

Battery Replacement

be plugged into the cubic equations also.

CFM (ft

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

Calibration and Repair Services

F (± 1

F (2

F/C ± 1.8

F/C ± 3.6

customer service for details on services available. Extech recommends that

calibration be performed on an annual basis to insure calibration integrity.

Tech support: Ext. 200; Email: support@extech.com

Repair/Returns: Ext. 210; Email: repair@extech.com

C) / < 80% RH

C) 0.1

F (0 to 50

F (-18 to 50

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

1.0 to 54.3 knots 0.3 knots ± (3% + 0.6 knots)

0.50 to 28.00 m/s 0.01 m/s ± (3% + 0.2 m/s)

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)

Meter Descript ion

Measurement Range Resolution Accuracy (% of reading)

Specifications

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

km/hr (kilometers per

hour)

Knots (nautical miles

per hour)

m/sec (meters per

second)

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 122

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

Dew Point 32 to 122

General Specifications

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

Display Dual LCD with low battery and multifunction indicators

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

F (-15 to 50

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

Water-resistant To 3’ (1m)

Operating conditions 5 to 122

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

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

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

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.

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

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

Introduction

wind-chill factor. With careful use, this meter will provide years of reliable service.

Operation

User Manual Model 45158 Mini Hygro Thermo-Anemometer

Turning the meter ON and OFF

• 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

• 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

Change the lower display parameter

blinking then release both buttons

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

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

Change the Air Velocity unit of measure

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

Select temperature units (oC or oF)

begins blinking then release the buttons

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

• Press both buttons momentarily to change temperature units

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

Taking Measurements

(opposite side of front panel logo). A tripod mount is located on the bottom of the meter.

• Position the meter so that the airflow enters the meter vane from the rear of the meter

• 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

• 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 freezes the most recent displayed reading

Max Hold

Average mode

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

Data Hold

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

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in

parts and workmanship for one year from date of shipment (a six month limited warranty

applies on sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website at ww w.extech.com (click on

Contact Extech and go to Service Department to request an RA number). A Return

Authorization (RA) number must be issued before any product is returned to Extech. The

sender is responsible for shipping charges, freight, insurance and proper packaging to prevent

damage in transit. This warranty does not apply to defects resulting from action of the user

such as misuse, improper wiring, operation outside of specification, improper maintenance or

repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect,

incidental or consequential damages. Extech's total liability is limited to repair or replacement

of the product. The warranty set forth above is inclusive and no other warranty, whether written

or oral, is expressed or implied.