Extech Instruments AN100 Manuel utilisateur

USER MANUAL

CFM/CMM Thermo Anemometer

Model AN100

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Introduction

Congratulations on your purchase of the Extech AN100 CFM/CMM Thermo Anemometer. This

instrument measures Air Velocity, Air Flow (volume) and Temperature. The large, easy-to-read

backlit LCD includes primary and secondary displays plus numerous status indicators. The

meter is shipped fully tested and calibrated and with proper use will provide years of reliable

service.

Descriptions

1. LCD Display

2. Vane Probe

3. Rubber Meter Jacket

4. Meter

5. Power On/Off Button

6. Area Button

7. AVG (Average) Button

8. Backlight Button

9. Temperature Buttons (see 11 & 12)

10. Airflow/Velocity Buttons (see 13 - 16)

11. MAX-MIN button for TEMPERATURE mode

12. °C °F units and HOLD for TEMPERTAURE functions

13. MAX-MIN button for AIR VELOCITY/AIR FLOW (also used as left arrow button)

14. UNITS for AIR VELOCITY/AIR FLOW mode (also used as up arrow button)

15. HOLD for AIR VELOCITY/AIR FLOW mode (also used as right arrow button)

16. NEXT button for AIR VELOCITY/AIR FLOW mode

 See next section for additional keypad description information.

 Battery compartment is located on rear of instrument, rubber meter jacket must be removed to

access battery compartment

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Keypad

• AUTO POWER OFF Press to turn the meter ON or OFF

• MAX/MIN (for Airflow/Air Velocity) Used to record and store the highest, lowest and average

airflow or velocity readings.

◄(LEFT) also serves as change decimal point button in AREA mode

• UNITS Press to select the mode of operation. In FLOW mode, the meter displays air volume. In

VELOCITY mode, the meter displays air speed.

▲(UP) also serves as increase number button in AREA mode.

• AVG Used to Average multiple readings in FLOW or VELOCITY mode. Up to 20 readings can be

averaged.

• HOLD Press to freeze the displayed reading. Press again to unlock display. This button also

functions as the ►RIGHT scroll button in AREA mode and RECALL mode.

• AREA Press and hold to manually enter the area of a duct in CFM or CMM mode

• NEXT In AREA mode, used to select memory locations 1-8.

• Press to turn the backlight on/off

• MAX/MIN (Temperature) Used to record and store the highest, lowest readings for air

temperature.

• °C °F HOLD (Temperature) Press to freeze the displayed temperature reading. Press again to

unlock the display. Press and hold for 3 seconds to switch between °C and °F. Meter will beep

twice to indicate change.

The Battery compartment is located on the back of the instrument. The rubber protective jacket

must be removed from the meter to access the compartment.

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Display

 MAX (top of LCD): Max Hold function engaged for the Air Temperature function

 HOLD (top of LCD): Data Hold function engaged for the Air Temperature function

 VEL: indicates that meter is in air velocity mode

 FLOW: indicates that meter is in air flow mode

 MAX (bottom of LCD): Max Hold for the IR Temperature and RH function

 HOLD (bottom of LCD): Data Hold for the IR Temperature function and RH function

 oC / oF: Temperature units of measure

 CFM/CMM: airflow units of measure

 Ft2, m2: units for area dimensions

 m/s, ft/min, km/h, MPH, knots: air velocity units of measure

 X10, X100: multipliers for air flow readings

 AVG: air averaging mode

 RECORD: indicates that min/max function is running (top for temp, bottom for air)

 Large LCD digits at center of display for Relative Humidity and IR Temperature

 Smaller LCD digits at top, right of display for Probe Temperature

 : Low battery indicator

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Operation

Connecting the Vane

1. The vane plug is inserted in the meter’s sensor jack at the top of the meter. The plug and jack

are keyed so that the plug can only fit in the jack one way.

2. Turn the plug carefully until it lines up with the jack and then firmly push the plug in place.

Do not apply undue force or try to twist the plug side-to-side.

3. If the vane is not connected to the meter or if the sensor is defective, the LCD display will

indicate OL in place of a Temperature reading.

Air Velocity Measurements (Single Point)

1. Turn on the meter using the ON/OFF button.

2. Press UNITS button to select the desired unit of measure.

NOTE: At power up the meter will display the last unit of

measure previously entered.

3. Place the sensor in the air stream. Ensure that the air enters

the vane as indicated by the arrow sticker placed inside the

vane.

4. View the readings on the LCD Display. The large main LCD

display shows the Air Velocity reading. The upper right LCD

sub-display shows the temperature reading.

Air Velocity Averaging Mode

1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice. The

AVG icon will be displayed.

2. Take a measurement and press the AVG button. A single beep will sound and the HOLD icon

will appear in the display.

3. The average reading will be displayed and number of readings measured will appear in the

upper right hand corner of the display. After 5 seconds, the display will return to the current

reading.

4. Repeat steps 2 - 3 until the desired number of points have been measured.

5. To return to standard velocity measuring mode press and hold AVG button until meter beeps

twice.

Note: In the standard velocity measuring mode, press the AVG button once to recall the

previous average. The average will be cleared when you enter the Averaging Mode again.

airflow

Arrow

Side view of Vane

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Air Flow Measurements (CMM / CFM)

1. Turn on the meter using the ON/OFF button

2. Press the UNITS button to select the desired air flow units: CMM

(cubic meters per minute) or CFM (cubic feet per minute).

NOTE: At power up the meter will display the last unit of

measure previously entered.

3. To begin entering the area in m2or ft2, press and hold the AREA

button until it beeps twice. The leftmost digit of the bottom

display will begin to flash.

4. Use the ▲(UP) button to change the flashing digit

Use the ◄(LEFT) button to move the decimal

Use ►(RIGHT) button to select the other digits.

After all of the digits are entered, press and hold the AREA button (until meter beeps twice)

to save the area into memory and return to CFM or CMM measuring mode.

5. Place the sensor in the air stream. Ensure that the air enters the vane as indicated by the

arrow sticker placed inside the vane. Refer to the diagram. The large main LCD display

shows the Air Velocity reading. The upper right LCD sub-display shows the temperature

reading.

The meter has 16 memory locations (8 for CFM and 8 for CMM) that can be used to store

commonly used area sizes that you can recall at anytime.

1. Press the AREA button until meter beeps twice. A memory location number will appear in

the top right of the display indicating the memory location.

2. Push the NEXT button to scroll thru and select the desired location. Once you have selected

the desired memory location enter your dimension

Use the ▲(UP) button to change the flashing digit

Use the ◄(LEFT) button to move the decimal

Use ►(RIGHT) button to select the other digits. After all of the digits are entered, press

and hold the AREA button (until it beeps twice) to save the area into memory and return to

CFM or CMM measuring mode.

To select and use a previously stored dimension, press and hold the AREA button until it beeps

twice.

Press NEXT to scroll thru the 8 memory locations. Press and hold the AREA button until it beeps

twice to return to CFM or CMM measuring mode.

airflow

Arrow

Side view of Vane

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Air Flow Averaging Mode

1. To enter 20 Point Averaging Mode, press and hold the AVG button until it beeps twice. The

AVG icon will be displayed.

2. Take a measurement and press the AVG button. A single beep will sound and the HOLD icon

will appear in the display.

3. The average reading will be displayed and number of readings measured will appear in the

upper right hand corner of the display. After 5 seconds, the display will return to the current

reading.

4. Repeat steps 2 - 3 until the desired number of points have been measured.

5. To return to standard airflow measuring mode press and hold AVG button until meter beeps

twice.

Note: In the standard velocity measuring mode, press the AVG button once to recall the

previous average. The average will be cleared when you enter the Averaging Mode again.

Data Hold (Air Velocity/Air Flow)

1. While taking measurements, press the HOLD button to freeze the air velocity/air flow

reading.

2. The HOLD indicator will appear in the bottom of the LCD display.

3. Press HOLD again to return to normal operation.

MAX/MIN/AVG Record (Air Velocity/Air Flow)

This allows the user to record and view the highest (MAX), lowest (MIN) and average (AVG)

readings.

1. Press the Airflow/Velocity MAX/MIN button. The MAX indicator and RECORD

indicator along with the Max reading will appear on the LCD display and the meter will begin

keeping track of the MAX, MIN and Average values.

2. Press the MAX/MIN button again to view the minimum reading. The MIN indicator along

with the minimum reading will appear on the LCD display.

3. Press the MAX/MIN button again to view the average reading. The AVG indicator along with

the average reading will appear on the LCD display.

4. Press the MAX/MIN button again to display current readings. NOTE: the meter will keep

recording MAX/MIN/AVG readings.

5. To clear and stop MAX/MIN/AVG recording and return to normal operation, press and hold

the MAX/MIN button until the meter beeps twice.

Automatic Power OFF

The meter automatically turns off after 20 minutes. To defeat this feature:

1. Turn the meter OFF.

2. Press and hold the (Backlight) key while turning the meter ON.

3. “dis APO” will appear in the display. The AUTO POWER OFF feature will now be disabled.

4. Note that AUTO POWER OFF is re-enabled each time the meter is turned on.

5. Also note that AUTO POWER OFF is disabled in CFM/CMM or Average mode.

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Battery Replacement

When appears on the LCD, the 9V battery must be replaced.

1. Disconnect the sensor.

2. Remove the meter’s rubber protective jacket

3. Use a Phillips screwdriver to open the rear battery compartment

4. Replace the 9V battery

5. Close the battery compartment and replace the meter’s protective jacket

Safety: Please dispose of batteries responsibly and never dispose of batteries in a fire, batteries

may explode or leak. When storing the meter for 60 days or more, remove the battery and store

separately.

Never dispose of used batteries or rechargeable batteries in household waste.

As consumers, users are legally required to take used batteries to appropriate collection

sites, the retail store where the batteries were purchased, or wherever batteries are

sold.

Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-

of-life devices to a designated collection point for the disposal of electrical and electronic

equipment.

WARNING: To avoid electric shock, do not operate the meter until the battery cover is in place

and fastened securely.

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Specifications

Air Velocity

Range

Resolution

Accuracy (% of reading)

m/s (meters per sec)

0.40 - 30.00 m/s

0.01 m/s

± (3%rdg + 0.20 m/s)

km/h (kilometers/hour)

1.4 - 108.0 km/h

0.1 km/h

± (3%rdg + 0.8 km/hr)

ft/min (feet per minute)

80 –5900 ft/min

1 ft/min

± (3%rdg + 40 ft/m)

mph (miles per hour)

0.9 –67.0 mph

0.1 mph

± (3%rdg + 0.4 MPH)

knots (nautical MPH)

0.8 to 58.0 knots

0.1 knots

± (3%rdg + 0.4 knots)

Air Flow

Range

Resolution

Area

CMM (cubic meters/min)

0-9999 m3/min

0 to 9.999m2

CFM (cubic ft/min)

0-9999 ft3/min

0 to 9.999ft2

Air Temperature

Range

Resolution

Accuracy

-10 - 60oC (14 - 140oF)

0.1oC/F

±2.0oC (4.0oF)

Circuit Custom LSI microprocessor circuit

Display Dual function 13 mm (0.5") 4-digit LCD

Sampling rate 1 reading per second approx.

Sensors Air velocity/flow sensor: Conventional angled vane arms with low-

friction ball bearing

Temperature sensor: NTC-type precision thermistor

Automatic Power off Auto shut off after 20 minutes to preserve battery life

Operating Temperature 0°C to 50°C (32°F to 122°F)

Storage Temperature -10 to 60oC (14 to 140oF)

Operating Humidity <80% RH

Storage Humidity <80% RH

Operating Altitude 2000 meters (7000ft) maximum

Battery One 9 volt (NEDA 1604) battery

Battery life 80 hours approx. (if the Backlight is used continuously, battery life

will be reduced significantly)

Power Consumption 8.3 mA DC approx.

Weight 725g (1.6 lbs) including battery & probe

Dimensions Main instrument: 178 x 74 x 33mm (7.0 x 2.9 x1.2")

Sensor Head: 70mm (2.75”) Inside Diameter

Sensor Head: 76.2mm (3.0”) Outside Diameter

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Useful Equations and Conversions

Area equation for rectangular or square ducts

Area equation for circular ducts

Cubic equations

NOTE: Measurements made in inches

must be converted to feet or meters before using the above formulae.

Unit of Measure Conversion Table

m/s

ft/min

knots

km/h

MPH

1 m/s

196.87

1.944

3.6

2.24

1 ft/min

0.00508

0.00987

0.01829

0.01138

1 knot

0.5144

101.27

1.8519

1.1523

1 km/h

0.2778

54.69

0.54

0.6222

1 MPH

0.4464

87.89

0.8679

1.6071

Width (W)

Height (H)

Area (A) = Width (W) x Height (H)

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

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

Radius

Area (A) = πx r2

Where π= 3.14 and r2= radius x radius

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