Extech Instruments AN200 User manual

User's Manual
CFM/CMM Thermo Anemometer +
InfraRed Thermometer
Model AN200
UNITS
AREA
RECALL
cf m / cmm
A nemometer
T hermometer
AN200
NEXT
PROBE
TEMPERATURE

AN200 V2.1 05/072
Introduction
Congratulations on your purchase of the Extech AN200 CFM/CMM Thermo Anemometer
with InfraRed Thermometer. This instrument measures Air Velocity, Air Flow (volume),
Air Temperature (with probe) and Surface Temperature (with the InfraRed function). The
large, easy-to-read backlit LCD includes primary and secondary displays plus numerous
status indicators. The InfraRed feature includes a laser pointer for convenient targeting.
In addition, the meter can store 16 area setting dimension for easy recall. This meter is
shipped fully tested and calibrated and with proper use will provide years of reliable
service.
Safety
•Use extreme caution when the laser pointer beam is on
•Do not point the beam toward anyone's eye or allow the beam
to strike the eye from a reflective surface
•Do not use the laser near explosive gases or in other
potentially explosive areas

AN200 V2.1 05/073
Specifications
Air Velocity Range Resolution Accuracy
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) 0-999999 m3/min .1 0 to 999.9m2
CFM (cubic ft/min) 0-999999 ft3/min .1 0 to 999.9ft2
Range Resolution AccuracyAir Temperature
14 - 140oF (-10 - 60oC) 0.1oF/C 4.0oF (2.0oC)
Range Resolution Accuracy
-58 to -4oF (-50 to -20oC) 0.1oF/C ±9.0oF (5.0oC)
InfraRed Temperature
-4 to 500oF (-20 to 260oC) 1oF/C ±2% reading or ±4oF
(2oC) whichever is
greater
Circuit Custom LSI microprocessor circuit
Display Dual function 0.5" (13 mm) 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 sensors: NTC-type precision thermistor and
InfraRed
IR Spectral response 6 to 14µm
IR Emissivity 0.95 fixed
IR distance ratio 8:1
IR sampling rate 2.5 readings per second approx.
Automatic Power off Auto shut off after 20 minutes to preserve battery life
Operating Temperature 32°F to 122°F (0°C to 50°C)
Storage Temperature 14 to 140oF (-10 to 60oC)
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 Backlight and Laser are used continuously
the battery life is reduced to 2 to 3 hours approx.)
Battery current 8.3 mA DC approx.
Weight 1.6 lbs. (725g) including battery & probe
Dimensions Main instrument: 7.0 x 2.9 x1.2" (178 x 74 x 33mm)
Sensor Head: 2.75” (70mm) Diameter

AN200 V2.1 05/074
Meter Description
1. Power ON/OFF button
2. Probe input jack
3. Laser pointer
4. IR Sensor
5. Rubber holster
6. LCD Display
7. IR thermometer
measurement button
8. Airflow buttons (4)
9. Air Temperature
function buttons (2)
10. Vane
11. Airflow Average button
12. Backlight button
Note: The battery
compartment, tilt stand and
tripod mount are located on
the rear of the instrument
Keypad
•Press to turn the meter ON or OFF
•IR + Laser Pointer Press and hold to measure.
•MAX/MIN Record and store the highest and lowest 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.
•HOLD Press to freeze the displayed reading. Press again to unlock display.
►(RIGHT) also serves as change digit button in AREA mode.
•AREA Press and hold to manually enter the area of a duct in CFM or CMM mode.
Press and hold to scroll thru memory locations.
This button also clears memory in the Averaging mode.
•Press to turn the backlight on/off. Hold to disable Auto Power Off.
•MAX/MIN (Temperature) Press to record and store the highest, lowest readings for air
temperature.
•HOLD (Temperature) Press to freeze the displayed temperature reading. Press again to
unlock the display.
•AVG Press and hold to enter averaging mode. Averages up to 20 readings.

AN200 V2.1 05/075
Display Layout
•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
•PROBE TEMP: Reminder that the top LCD digits represent Air (Vane) Temperature
•: Indicates that the laser pointer is on.
•IR TEMP: Indicates that the larger LCD digits represent IR temperature measurement
•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

AN200 V2.1 05/076
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 dashed lines in place of an air velocity reading.
Air Velocity Measurements
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. Refer to
the diagram.
4. View the air velocity and temperature 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 Measurements (Up to 20 Point averaging)
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 all desired 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

AN200 V2.1 05/077
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 AREA 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 AREA to scroll thru the 8 memory locations. Press and hold the AREA button until it
beeps twice to return to the CFM or CMM.measuring mode.
Air Flow Measurements (Up to 20 Point averaging)
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. (IMPORTANT: Please note that the average readings are only held for
5 seconds and cannot be recalled.)
4. Repeat steps 2 - 3 until all desired points have been measured.
5. Press the AREA button to clear the multipoint averaging memory.
6. To return to standard airflow measuring mode press and hold AVG button until meter
beeps twice.
airflow
Arrow
Side view of Vane

AN200 V2.1 05/078
Data Hold (Air Velocity/Air Flow)
1. While taking measurements, press the HOLD button to freeze the air velocity/air flow
reading for later viewing.
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 button MAX/MIN button. The AVG indicator and RECORD indicator along
with the average 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. The MAX indicator will appear on the display and
display the Max reading.
3. 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 and display the Min
reading.
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 the
AREA button once when displaying the current reading.

AN200 V2.1 05/079
Temperature Units
1. Remove the meter’s rubber protective jacket and select the desired temperature units
using the °F/°C slide switch located in the battery compartment.
2. Replace the protective jacket and connect the sensor to the sensor input jack on top of
the meter.
Data Hold (Air Temperature)
1. While taking measurements, press the PROBE TEMPERATURE HOLD button to
freeze the air temperature reading.
2. The HOLD indicator will appear in the bottom of the LCD display.
3. Press PROBE TEMPERATURE HOLD again to return to normal operation.
Max/Min Record (Air Temperature)
This allows the user to record and view the highest (MAX), lowest (MIN) air temperature
readings.
1. Press the TEMPERATURE MAX/MIN button once. The MAX indicator will appear on
the display and the meter will begin keeping track of the MAX/MIN air temperature
values.
2. Press the button again to view the minimum reading. The MIN indicator along with the
minimum air temperature reading will appear on the LCD display.
3. Press the button again to return to normal operation.
Automatic Power OFF
To conserve battery life, the meter automatically turns off after 20 minutes. To override 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 mode.

AN200 V2.1 05/0710
InfraRed (Non-Contact) Temperature Measurements
1. The IR sensor is located at the top of the meter.
2. Point the sensor toward the surface to be measured.
3. Press and hold the red IR button to begin measuring the surface
temperature of a desired target. IR TEMP and will appear on
the display. The laser pointer will switch on to help aim the meter.
4. The measured IR surface temperature will appear at the center of
the LCD (larger digits). The temperature displayed is the
temperature of the area within the spot.
5. When the red IR button is released, the laser pointer will switch
off and the reading will freeze (data hold) on the display for
approximately 3 seconds.
6. Note that the vane (Air Temperature) continues to monitor
temperature during IR tests and its temperature is displayed on
the top of the LCD (smaller digits).
7. After approximately 3 seconds the meter defaults to the Air Flow
and Air Temperature display.
WARNING: Do not directly view or direct the laser pointer at an eye. Low power
visible lasers do not normally present a hazard, but may present some potential for
hazard if viewed directly for extended periods of time.
Battery Replacement
When appears on the LCD, the 9V battery must be replaced.
1. Disconnect the vane.
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

AN200 V2.1 05/0711
InfraRed Measurement Considerations
•When taking IR measurements the meter automatically compensates for ambient
temperature changes. Note that it may take up to 30 minutes to adjust to extremely
wide ambient changes.
•Low temperature measurements quickly followed by high temperature measurements
may require several minutes to stabilize as a result of the IR sensor cooling process.
•If the surface of the object under test is covered with frost, oil, grime, etc., clean before
taking measurements.
•If an object's surface is highly reflective apply masking tape or flat black paint before
measuring.
•Steam, dust, smoke, etc. can obstruct measurements.
•To find a hot spot, aim the meter outside the area of interest then scan across (in an up
and down motion) until the hot spot is located.
IR Theory
IR thermometers measure the surface temperature of an object. The meter’s optics sense
emitted, reflected, & transmitted energy that is collected and focused onto the meter’s
detector. The meter’s circuitry translates this information into an LCD reading.
IR Field of View
Ensure that the desired target is larger than the spot size as shown in the diagram below.
As the distance from an object increases, the spot size of the area measured by the meter
becomes larger. The meter’s field of view ratio is 8:1, meaning that if the meter is 8 inches
from the target, the diameter (spot) of the object under test must be at least 1 inch. Other
distances are shown below in the field of view diagram.
Emissivity
Most organic materials and painted or oxidized surfaces have an emissivity of 0.95.
Inaccurate readings will result when measuring shiny or polished surfaces. To
compensate, cover the surface under test with masking tape or flat black paint. Allow time
for the tape to reach the same temperature as the material underneath then measure the
temperature of the tape or the painted surface.

AN200 V2.1 05/0712
Thermal Emissivity Table for Common Materials
Material Emissivity Material Emissivity
Asphalt 0.90 to 0.98 Cloth (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Leather 0.75 to 0.80
Sand 0.90 Charcoal (powder) 0.96
Earth 0.92 to 0.96 Lacquer 0.80 to 0.95
Water 0.67 Lacquer (matt) 0.97
Ice 0.96 to 0.98 Rubber (black) 0.94
Snow 0.83 Plastic 0.85 to 0.95
Glass 0.85 to 1.00 Timber 0.90
Ceramic 0.90 to 0.94 Paper 0.70 to 0.94
Marble 0.94 Chromium oxides 0.81
Plaster 0.80 to 0.90 Copper Oxides 0.78
Mortar 0.89 to 0.91 Iron Oxides 0.78 to 0.82
Brick 0.93 to 0.96 Textiles 0.90

AN200 V2.1 05/0713
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 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
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) = x r2
Where  = 3.14 and r2= radius x radius

AN200 V2.1 05/0714

Support line [phone]
Technical support: Extension 200; E-mail: [e-mail]
Repair & Returns: Extension 210; E-mail: [email protected]
Product specifications subject to change without notice
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
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 to 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
[phone] ext. 210 for authorization or visit our website www.extech.com for contact
information. 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.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also
provides NIST certification for most products. Call the Customer Service Department for
information on calibration services available for this product. Extech recommends that
annual calibrations be performed to verify meter performance and accuracy.
Copyright ©2006 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.