English User's Manual

 USER GUIDE Large Vane CFM/CMM Anemometer / Psychrometer + CO2 Model AN320 Introduction Congratulations on your purchase of the Extech AN320 Vane Airflow Anemometer Psychrometer + CO2. This instrument measures Air Velocity, Air Flow (volume), Air Temperature, Relative Humidity, Wet Bulb Temperature, Dew Point Temperature, and CO2 (carbon dioxide). The large, easy‐to‐read backlit LCD includes primary and secondary displays plus numerous status indicators. The optional round and square airflow cone adaptors allow for quick air flow (volume) measurements. This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check for the latest version of this User Guide, Product Updates, and Customer Support. CAUTIONS 
Improper use of this meter can cause damage to the meter and personal injury. Read and understand this user manual before operating the meter. 
Inspect the condition of the probe and the meter for any damage before operating the meter. Repair or replace damage before use. 
If the equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired. 
This device should not be made available to children. It contains hazardous objects as well as small parts that can be accidentally swallowed. The meter’s batteries and packing material can also be dangerous to children. 
In the event that the meter is to be unused for an extended period of time, remove the batteries to protect against battery leakage. 
Expired or damaged batteries can be hazardous if allowed to come in contact with skin. Use suitable hand protection in such cases. 
Do not short circuit batteries or put batteries in fire. 2
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Meter Description Meter Description (front) 1.
Top line LCD display reading 2.
Bottom line LCD display reading 3.
U/mode AVG and up arrow button 4.
L/mode and down arrow button 5.
ON‐OFF (Power) and SET button 6.
HOLD, MAX‐MIN, and left arrow (Enter) button 7.
Unit of measure symbol for lower display row 8.
Unit of measure symbol for upper display row 9.
Air Velocity Vane Meter Description (rear) 10. Air temperature, humidity, and CO2 sensors 11. Battery compartment 3
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Brief Keypad Description Press momentarily to switch the meter ON or OFF. Press and hold this button for 2 seconds to enter or exit the Setup mode (refer to Setup mode section for details). SET
o Press momentarily to freeze the displayed reading (HOLD icon switches ON); press again momentarily to exit the HOLD mode (HOLD icon switches OFF) o Press and hold for 2 seconds to display the MIN (minimum) reading; press and hold again to display the MAX (maximum) reading; Press and hold a third time to exit o This button is also used in the AVERAGE mode (for recording readings one at a time or for a ‘timed’ recording session) and in the SETUP mode (for configuring the meter). Please review the AVERAGE and SETUP mode sections for details HOLD
Press momentarily to toggle between ppm (CO2), humidity, and air velocity readings. Press and hold for 2 seconds to access the Multi‐Point Average and Timed Average modes (the AVG icon switches ON). Detailed instructions for these modes are provided later in this guide. In the Setup mode press to select a category or to increase a value (refer to Setup mode later in this guide) ▲
Press to toggle the lower display between air temperature, air volume, wet bulb temperature, and dew point temperature readings; Also used in the Multi‐Point Average, Timed Average, and Setup modes; refer to the AVERAGE and SETUP modes sections later in this guide U/mode
With the meter switched OFF, press and hold these two buttons to disable Auto Power OFF. Detailed AUTO POWER OFF (Sleep mode) instructions are provided later in this guide + + U/mode
Press all 3 buttons simultaneously to enter the Calibration mode. Calibration instructions are provided in detail later in this guide 4
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Display Layout 1.
Lower Display digits (air volume, temperature, timer, or menu parameter displays) 2.
Upper Display digits (air velocity, humidity, CO2, or menu display parameters) 3.
Optional Cone or Funnel attachment icon 4.
Units of measure for duct area programming 5.
Vane indicator (flashes very briefly on power up) 6.
Display HOLD icon 7.
MAX mode icon 8.
MIN mode icon 9.
Recording icon 10. Elapsed Timer icon 11. AVG mode icon 12. Battery status icon 13. Unit of measure icons* *Full list shown. Available units of measure icons vary by model. 5
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Operation Air Velocity and Air Volume Measurements 1. Switch the meter ON by pressing the POWER button momentarily. The meter will countdown from 30 to 0 as it performs a self‐test. Press the POWER button again to switch the meter OFF. 2. Note that the meter will automatically enter the sleep mode after 20 minutes of inactivity. To disable this feature: with the meter OFF, press and hold the POWER and the U/mode buttons for 2 seconds. The LCD will display 'n' as it switches ON. Now the sleep mode is disabled and the user must press the POWER button momentarily to switch the meter OFF. 3. When the meter is ON, the upper display can indicate air velocity, relative humidity, or CO2 (use the U/mode button to scroll). The lower display digits can indicate air flow, dew point temperature, wet bulb temperature, or air temperature (use the L/mode button to scroll). 4. Place the sensor in the air stream. The air must enter the vane from the rear of the meter. The Air Temperature, Relative humidity, and CO2 sensors are located at the center of the vane on the rear of the meter. 5. Read the measurement data on the LCD. Air velocity readings are indicated in meters per second (m/s) or feet per minute (fpm). Temperature readings (air, dew point DP, or wet bulb WBT) are indicated in °C/°F. Air flow (volume) is indicated in CFM (cubic feet per minute) or CMM (cubic meters per minute). Use the L/mode button (for lower display) and the U/mode button (for upper display) to scroll through the displayed reading options. 6. To change between Imperial and Metric units of measure refer to the SETUP Mode section. 7. To measure the Air Volume of a duct, first measure the duct’s area (see the Appendix for 2
area calculations) and then enter the area value in the meter’s SETUP mode in in or cm . After the area value has been entered, use the L/mode button to scroll to the air volume display (CMM/CFM) on the lower digits. Place the meter in air stream to measure volume. 8. Optional: measure Air Volume with an airflow Cone or Square adaptor by first attaching one of the adaptors to the meter (the optional cone adaptor kit includes a round and a square cone; kit part number AN300‐C). The meter will automatically recognize that the adaptor is attached to the meter and a cone icon will appear on the display. Note: regardless of the AREA setting in the SETUP mode, the meter will default to the dimensions of the vane opening. Ensure that the airflow adaptor is well mounted and locked before taking measurements. LCD backlight Press the U/mode button to switch ON the LCD backlight. The backlight will automatically switch OFF after approximately 10 seconds to conserve battery power. Note that the backlighting switches ON automatically when the meter is switched ON by the user. 6
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Relative Humidity, Wet Bulb/Dew Point Temperature, and CO2 Readings Sensors are built in to the center of the vane (rear of meter) and are used to measure relative humidity, air temperature, and CO2. Wet Bulb and Dew Point temperatures are calculated based on temperature and humidity readings. 1. Press U/mode to scroll to RH (%) or CO2 (ppm) modes. The measured relative humidity or carbon dioxide readings will be displayed on the upper LCD digits as selected. 2. Use the L/mode button to scroll through air temperature, dew point temperature, wet bulb temperature, and air flow (volume) readings. 3. To measure the humidity using an offset reference value, please access the Setup mode and input the offset value as described in the Setup mode section. The LCD will display the measured value minus the offset value once the offset is programmed in the Setup mode. Data Hold Mode 1. Press the HOLD button from the normal operating mode to freeze the current measurement. 2. The ‘HOLD’ icon will appear at the top of the LCD display. 3. Press HOLD again to return to normal operation. The ‘HOLD’ icon will switch OFF and the meter will return to displaying readings in real time. MAX/MIN Mode The MAX‐MIN feature records the highest (MAX) and lowest (MIN) readings captured since the MAX‐MIN mode was accessed. 1. Press and hold the MAX/MIN button for 2 seconds to begin displaying the lowest (minimum) readings encountered since this mode was accessed. The ‘MIN’ icon will appear at the top of the LCD display indicating that the readings shown are the lowest measured. 2. Press and hold the MAX/MIN button again for 2 seconds to display the maximum readings encountered. The ‘MAX’ icon will appear on the LCD. 3. Press and hold this button again for 2 seconds to return to the normal mode of operation (the ‘MIN’ and ‘MAX’ icons should switch OFF). 4. While viewing the MAX or MIN data, use the L/mode button to switch the display so that the Air Volume MIN and MAX readings can be viewed also. 5. Press and hold MAX/MIN for 2 seconds to return to the normal operation mode. Multi‐Point Average Mode 1. From the normal operating mode press the U/mode button for 2 seconds to enter Multi‐
Point Average mode (the AVG display icon and the associated black dot • will switch ON). 2. Press the HOLD button momentarily to record one reading. The upper display digits will show the reading’s memory location number and the lower display will show the measured value. Press the HOLD button again to take and store another reading; the memory location number will increment by one and the current reading will be stored in this new memory location. The meter can store up to 19,999 points in memory. 3. Press U/mode momentarily to see the multi‐point mean (average) for all of the readings recorded during the session (the '•AVG' display icon will flash during this process). 4. Press L/mode to view the average reading for the other available parameters. 5. Press U/mode momentarily to return to the normal operating mode. 7
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Timed Average Mode 1. From the normal operating mode, press and hold the U/mode button for 2 seconds to enter the Multi‐Point Average mode first and then press U/mode one more time momentarily to enter the Timed Average Mode (the AVG and the elapsed timer icons will switch ON). 2. Press HOLD to begin recording. The elapsed timer starts (as shown on the upper display digits) and the clock icon flashes on and off. The longest amount of time the meter can operate in Timed Average Mode is 19,999 seconds. 3. Press U/mode to stop the clock and to calculate the timed average. The upper LCD will display the elapsed time and the lower LCD will show the averaged readings. The LCD will flash the 'AVG' and the elapsed timer icons. 4. Press L/mode to view the average for other available measurements. 5. Press U/mode to return to the normal operating mode. Setup Mode Entering Setup Mode Press and hold the POWER SET button for 2 seconds to enter Setup mode. Two options are available: P1.0: Unit and P2.0: AREA. Use the up/down buttons to toggle between P1.0 UNIT and P2.0 AREA options. P1.0: Unit Selection 1. Once in setup mode, at the P1.0 UNIT display, momentarily press the HOLD button to enter the P1.0 UNIT menu. 2. Use either arrow button to switch between metric and imperial units. The available units are: air velocity (m/s, fpm), temperature (C, F), air volume (CMM, CFM), and area size (cm², inch²). 3. Press HOLD momentarily to return to the P1.0 display. 4. Press either arrow button to move to the P2.0 AREA option and follow the steps below. P2.0: Area Size Selection (enter square inches or square centimeters) 1. In setup mode, from the P2.0 AREA display, press HOLD to enter the AREA setting menu. The LCD will show ‘99999’ in the lower display with the first digit flashing. 2. Use the up arrow button change the flashing digit (from 0 through 9). 3. Use the down arrow button to move to the next digit. Use the up arrow button again to change the flashing digit. Continue in this way until the desired AREA value is displayed. 4. Press the Hold button again momentarily to store the value and to return to the P2.0 display. 5. Press either arrow button to move to the P3.0 RH OFFSET option and follow the steps below. P3.0: Relative Humidity (RH) Offset Selection 1. When in setup mode P3.0 press HOLD to enter the RH offset setting. The LCD will show 0.0 RH in the upper display. 2. Press U/mode to increase offset value and L/mode to decrease offset. 3. Pres HOLD once more to return to P3.0. 4. Press and hold the POWER SET button for 2 seconds to return to the normal operating mode. 8
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P4.0: Altitude Pressure Compensation 5. When in setup mode P4.0, press HOLD to enter the pressure compensation parameter. The LCD will show hPA (unit of measure: hector‐Pascal or millibar) on the lower line and a flashing 4‐digit number (from 700 to 1990; the default is 1013 hPA which is standard pressure) on the upper line. 6. Press U/mode to increase the pressure value and L/mode to decrease it. 7. Press HOLD once more to return to P4.0. 8. Press and hold the POWER SET button for 2 seconds to return to the normal operating mode. Calibration CAUTION: Do not calibrate the meter in air with an unknown CO2 concentration. Doing so will result in the meter being calibrated to the standard 400 ppm and could lead to inaccurate results. 1. Place the meter in a calibrated environment. 2. With the meter OFF, press SET, HOLD and L/mode simultaneously to enter CO2 calibration mode. 3. The meter will run a 30 second countdown and 'CAL' will show in the lower display. 4. During calibration a CO2 reading between 380‐420ppm will flash in the upper display. 5. Wait for approx. 10 minutes for the reading to stop flashing. 6. The calibration is now complete and the meter will return to the normal operating mode. 7. To abort the calibration at any time, turn OFF the meter. 8. If the calibration fails for any reason please return the meter to Extech Instruments for an evaluation and possible repair. 9
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Battery Replacement When appears on the LCD, the AAA batteries must be replaced. The battery cover is located on the back of the meter. 1. Open the rear battery compartment by carefully pulling down on the compartment’s latch. 2. The battery compartment cover should be completely removed before proceeding. 3. Replace the four (4) 1.5V ‘AAA’ batteries ensuring proper polarity. 4. Close the battery compartment before attempting to use the meter. 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. Other Battery Safety Reminders o Never dispose of batteries in a fire. Batteries may explode or leak. o Never mix battery types. Always install new batteries of the same type. 10
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Specifications Air Velocity Ranges Resolution Accuracy m/s (meters per sec) 0.2 – 30 m/s 0.01 m/s ± (1.5%rdg + 0.3 m/s) fpm (feet per minute) 40 – 5900 fpm 1 fpm ± (1.5% rdg + 59 fpm) Range Resolution Accuracy 0.1%‐99.9%RH 0.1 RH ±3%RH (10‐90%RH) Relative Humidity RH ±5%RH (<10% or >90%) Air Flow Ranges Resolution CMM (cubic meters/min) 0‐99999 m3/min CFM (cubic ft/min) 0‐99999 ft3/min Temperature Ranges 0.1 up to 9999.9
then 1.0 0.1 up to 9999.9
then 1.0 Resolution Air and Wet Bulb: o
F/oC Dew Point: o o
0.1 C( F) o
‐5 to 60 C (23 to 140 F) CO2
0 to 99999in Accuracy Range (readings over 5000 are not specified) 11
±1.2°C (51 to 60°C) ± 1.1°F (‐5 to 122°F) ± 2.2°F (123 to 140°F) Resolution Accuracy 1 ppm ± (30ppm + 5% of rdg) from 0 to 5000ppm 0 – 9999 ppm PPM (parts per million) 2
0 to 99999cm ±0.6°C (‐20 to 50°C) o
‐20 to 60 C (‐4 to 140 F) o
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Circuit Custom LSI microprocessor Display Dual function 13 mm (0.5") 4‐digit LCD Sampling rate 1 reading per second approx. Air velocity/flow sensor Conventional angled vane arms with low‐friction ball bearing Temperature Sensor NTC‐type precision thermistors CO2 Sensor NDIR CO2 sensor Automatic Power off Auto shut off after 20 minutes to preserve battery life (sleep mode) Operating Temperature 0°C to 50°C (32°F to 122°F) Storage Temperature ‐10°C to 50°C (14 to 122oF) Operating Humidity <80% RH Storage Humidity <90% RH Operating Altitude 2000m (7000 ft.) maximum Battery Power Four (4) ‘AAA’ 1.5V batteries Battery Life > 40 hours Battery consumption 8.3 mA DC (approx.) Weight 725g (1.6 lbs.) including battery and probe Dimensions Main instrument: 269 x 106 x 51mm (10.6 x 4.2 x 2”) Vane inner diameter: 100mm / 3.94 inches Optional Air Flow Adaptors: Round: 210mm (8.3”) Diameter Square: 346 x 346mm (13.6 x 13.6”) 12
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Error Messages Error codes and solutions Air Temperature E02: Temperature reading is lower than the low range limit. Place the meter in room temperature for 30 minutes. If E02 continues, send the unit to Extech for repair. E03: Temperature exceeds the high range limit. Place the meter in room temperature for 30 minutes. If E03 continues to appear, send the unit to Extech for repair. E31: The A‐to‐D converter requires replacing. Send the meter to Extech Instruments for repair. Relative Humidity (RH) E04: Temperature error corrupted the humidity reading. Check the temperature error solution section. E11: RH calibration error. Send to Extech Instruments for repair. E33: RH measurement circuit error. Send to Extech Instruments for repair. Dew Point (DP) and Wet Bulb (WBT) Temperature E04: Temperature or RH error. Check temperature or RH error solutions. Air velocity E03: Velocity exceeds the high range limit. Test the meter using an air velocity that is known to be within the specified range limits. Send the unit to Extech for repair if the E03 error message persists. Air volume E03: Reading exceeds the meter’s display limit. Check that the AREA setting is correct in the Setup Mode. E04: Air velocity error. Return meter to Extech for repair. CO2 E01/E33: Voltage too low or CO2 module error. Check if the low battery icon is displayed on the LCD, if yes, replace with new batteries. Try a recalibration, or send the unit to Extech for repair if the problem persists. Other Errors E32: Memory IC error. Reboot the meter and check it again; send it to Extech Instruments for repair if the error message persists. No display 1. Check that the batteries are making good contact and are aligned for correct polarity. 2. Replace batteries. Display switches OFF automatically This symptom could be the normal ‘Sleep Mode’ which switches the meter OFF after 20 minutes of in‐activity. If this is not the ‘Sleep Mode’, check whether the low battery indicator appears before the LCD attempts to switch ON; if yes, replace the batteries. 13
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Appendix: Useful Equations and Conversions Area equation for rectangular or square ducts Height (H) Area (A) = Width (W) x Height (H) Width (W) Area equation for circular ducts 2
Area (A) = pi x r
Where pi = 3.14 and r = radius x radius Radius Cubic equations 3
CFM (ft /min) = Air Velocity (ft/min) x Area (ft ) 3
CMM (m /min) = Air Velocity (m/sec) x Area (m ) x 60 NOTE: Measurements made in inches or centimeters must be converted to feet or meters before using these formulae. Unit of Measure Conversion Table m/s ft/min knots km/h MPH 1 196.87 1.944 3.6 2.24 1 ft/min 0.00508 1 0.00987 0.01829 0.01138 1 knot 0.5144 101.27 1 1.8519 1.1523 1 km/h 0.2778 54.69 0.54 1 0.6222 1 MPH 0.4464 87.89 0.8679 1.6071 1 1 m/s Copyright © 2014‐2015 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form www.extech.com 14
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