Extech Instruments EA80 Manuale utente

User Manual

Indoor Air Quality Meter/Datalogger

Model EA80

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EA80-en-GB_V3.6 11/16

Introduction

Congratulations on your purchase of the Extech EA80 Indoor Air Quality Meter. This meter

measures Carbon Dioxide (CO2, ppm) levels, ambient Temperature and Relative Humidity

(%RH). 16,200 readings can be logged by the meter and later transferred to a PC. This

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

reliable service.

Description

1. Display

2. Gas exhaust

3. Gas inlet port (rear of meter)

4. PC Interface jack

5. AC adapter socket (9V, 300mA)

6. Power Button

7. Data Hold Button

8. Backlight Button

9. MX/MN Button

10. SET Button

11. ALARM button

12. MEM (memory) button

13. (Enter) button

14. READ button

15. TIME button

16. °C/°F button

17. DEW button

18. WET button

19. Temperature / Humidity sensor probe

Three Tier LCD Display

15 16

SET

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Preparation for Use

Power Supply

The meter is powered by six (6) 1.5V ‘AAA’ alkaline batteries or by an AC adapter.

Installing the Batteries

Insert six (6) AAA batteries as indicated by the diagram located on the inside of the

battery compartment.

When the battery voltage drops below the operating voltage, the “ +” indicator will

be displayed indicating that the batteries need to be changed.

AC Adapter

The AC adapter allows the meter to be powered from a common AC wall outlet. When

using the AC adapter, the batteries (if installed) will be bypassed. The AC adapter is

not a battery charger.

Gas Inlet

Always ensure that the meter’s gas inlet port (3), the vented opening located on the

rear of the meter, and gas exhaust port (2), which is located at the top of the meter,

are not blocked.

Operation

Note: Exhaled CO2will affect the accuracy of the reading; do not hold meter

near the face.

Taking Measurements

The sensor for Temperature, Humidity, Dew Point, and Wet Bulb measurements is

located in the remote probe. Hold the probe in the air in the area to be tested. DO NOT

immerse in liquid. The sensor for CO2 measurements is located at the top of the meter.

Selecting temperature units of measure (C/F)

Press the °C/°F button momentarily to toggle the temperature units.

CO2 Measurement

1. Press button to turn on the meter,

2. The sensor requires a 30 second warm-up

before displaying the CO2 measurement.

3. The meter sensor requires approximately10

minutes to stabilize in still air before the

readings can be considered accurate. Moving

the meter may decrease this stabilization time.

4. The primary display indicates the CO2 reading.

The secondary display indicates temperature. The third display indicates %RH.

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Humidity Measurement

1. Press the “ ” button to power the meter ON.

2. The display will indicate the humidity reading (% RH) directly on the third display.

3. Hold the probe in the air in the area to be tested. Do NOT immerse in liquid.

4. Allow adequate time for readings to stabilize.

5. Read the measurements on the LCD.

Temperature Measurement

1. Press the “ ” button to power the meter ON.

2. Press the °C/°F button momentarily to toggle the temperature units.

3. The display will show the Temperature reading directly on the second display.

4. Allow adequate time for readings to stabilize.

5. Read the measurements on the LCD.

Dew Point Temperature Measurement

1. Press the “ ” button to power the meter ON.

2. Press the “DEW” button

3. The display will show the Dew Point Reading on the second display.

4. Allow adequate time for the readings to stabilize

5. Read the measurements on the LCD.

6. Press the “DEW” button again to exit the dew point temperature reading.

Wet Bulb Temperature Measurement

1. Press the “ ” button to power the meter ON.

2. Press the “WET” button

3. The display will show the Wet Bulb Reading on the second display.

4. Allow adequate time for the readings to stabilize

5. Read the measurements on the LCD.

6. Press the “WET” button again to exit the display.

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EA80-en-GB_V3.6 11/16

MAX

ppm

d-h

m:s

MIN

ppm

d-h

m:s

ppm

d-h

m:s

CO2Maximum and Minimum Recording Measurement

1. Press “MX/MN” button to enter the maximum /

minimum recording mode, the “MAX” icon

appears on the display. The maximum CO2

reading will be displayed and will be updated

only when a higher reading occurs.

2. Press “TIME” button to enter time display mode.

Displays 2 and 3 will indicate the time the

maximum reading occurred.

3. Press “MX/MN” button again. The “MIN” icon

will appear with the minimum value and its

stamp time.

4. Press “MX/MN” button again. The “ᇞ” icon will

appear with the current value and current time.

5. Press “MX/MN” button again cycle through the

recorded MAX, MIN and current readings.

6. Press “” button to exit this mode.

7. Press “TIME” button exit the time display

mode.

Data Hold

1. Press the Hbutton momentarily to freeze the

displayed reading. The 'H' icon will appear on

the upper left-hand side of the display.

2. Press the Hbutton again to return to normal

operation (the 'H' hold icon will disappear).

Backlight

1. Press the button to turn the backlight on or off.

2. The backlight will turn off automatically after 30 seconds.

SET

MAX

MIN

ALM

Err

INTV

Err

ppm

%RH

d-h

DEW

WET

°C°F

ppm

m:s

8888

8888 8888

CAL

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EA80-en-GB_V3.6 11/16

SET

ALM

ppm

CO2Alarm Operation

Setting the Alarm Limit Values

1. Press “ALARM” button to turn on the alarm function, the “ALM” icon, and current

value are displayed.

2. Press “SET” button to enter High/Low limit

value setting mode, the “SET” icon is displayed

and hundred and thousand digits of the high

limit value will flash.

3. Press “” or “” button to set desired value.

4. Press “” button to move the cursor to set the

tens and ones digits.

5. Press “” or “” button to enter the desired value.

6. Press “” button to move the cursor to the hundred and thousand digits of the low

limit value.

7. Press “” or “” button to set desired value.

8. Press “” button to move the cursor to move the cursor to set the tens and ones

of the low limit value.

9. Press “” or “” button to set desired value.

10. To change any setting, press “” or “” button to move the cursor to desired high

or low limit value position.

11. Press “” button to store these setting and exit this mode.

Turning Alarm On / Off

1. Press “ALARM” button to turn on the alarm function, “ALM” is displayed.

2. When the CO2value is below the low limit value, the meter displays “” mark and

beeps.

3. When the CO2value exceeds the high limit value, the meter displays “” and

beeps.

4. To exit the ALARM function, press “ALARM” button again.

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Setting the Real Time Clock

1. Press “SET” button to enter the real-time clock

setting mode, “SET” is displayed and the

minutes are flashing.

2. Press “” or “” button to set the minutes.

3. Press “” button to move the cursor to

seconds.

4. Press “” or “” button to set the seconds.

5. Press “” button to move the cursor to days.

6. Press “” or “” button to set the day of the real time date. (Please note that this

is not a calendar. Days are elapsed days up to 99 total)

7. Press “” button to move the cursor to the hours. (Please note that this is a 24

hour clock)

8. Press “” or “” button to set the hours.

9. To change any setting, press “” or “” button to move the cursor to desired

position.

10. Press “” button to store the settings and exit this mode.

SET

MAX

MIN

ALM

Err

INTV

Err

ppm

%RH

d-h

DEW

WET

°C°F

ppm

m:s

8888

8888 8888

CAL

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EA80-en-GB_V3.6 11/16

Manual Datalogging

Storing readings

Press the "MEM" button. The LCD will display "M" and the

memory address number. The total memory size is 99

readings.

Viewing readings

Press the "READ" button to enter READ mode. The LCD

will display "R" and the memory address number.

Press " " or " " to scroll through the stored readings.

Press " " enter to exit this mode.

Deleting stored data

Press the “SET” button three times. The LCD will display “CLr” and the meter will enter

the Clear Memory mode.

Press “” to clear the all manually stored readings.

To abort, press the “SET” button twice and then press the “” button to exit the Clear

Memory mode.

Auto Datalogging

Setting interval time

Press “SET” two times. The “INTV” mark will appear and the meter will enter the

Interval Time setting mode.

Use the “” or “” button to select the desired interval time from 1 to 255 seconds.

Press the “” button to store the value and to exit the mode.

Auto Datalogging mode

Press and hold “MEM” for two seconds (3 beeps), the LCD will display the “ ” icon

and the memory location.

The “M” will flash each time a recording is made.

The maximum memory capacity is 16,200 recordings that can be divided into 99 sets.

Press the “” button to exit this mode and to stop recording.

Deleting Logged Data

Press “SET” four times, the “CLr” and “ ” mark will be displayed.

Press the “” button to clear the automatically stored data and to exit this mode.

To abort, press the “SET” button again then press the “” button to exit.

SET

MAX

MIN

ALM

Err

INTV

Err

CO2

ppm

%RH

d-h

DEW

WET

°C°F

ppm

m:s

8888

8888 8888

CAL

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EA80-en-GB_V3.6 11/16

Calibration

CO2 Calibration

1. Press “ ” to turn the meter on.

2. Place the meter in a known CO2 reference for 10 minutes.

3. Press the “SET” button 5 times until “C-01” is displayed in the second display.

4. Press “►” or “◄” to select digits to adjust (flashing).

5. Press “▼” or “▲”to adjust the display to the reference value.

6. Press “” to store the value and exit the calibration mode.

Humidity Calibration

1. Press “ ” to turn the meter on.

2. Place the probe in a known humidity reference for 60 minutes.

3. Press the “SET” button 6 times until “SET” and “CAL” are displayed on the LCD.

4. Press “▼” or “▲” to adjust the display to the reference value.

5. Press “” to store the value and exit the calibration mode.

Temperature Calibration

1. Press “ ” to turn the meter on.

2. Place the probe in a known temperature reference for 60 minutes.

3. Press the “SET” button 7 times until “SET” and “CAL” are displayed on the LCD.

4. Press “▼” or “▲” to adjust the display to the reference value.

5. Press “” to store the value and exit the calibration mode.

PC Interface, Software Installation and Operation

This meter has the capability to connect to and communicate with a PC. To install and use

the software, please refer to the instructions provided on the supplied CD-ROM and/or the

instructions provided in the HELP Utility within the software program.

Check the software download page of the website

the PC software and its operating system compatibility.

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Specifications

Display Three Tier LCD

Display Rate One reading per second

Low Battery Indication The “ +” icon is displayed when the battery voltage

drops below the operating voltage

Power Supply Six (6) AAA-size alkaline batteries or AC adapter (120V)

Battery Life Approx. 8 hours using alkaline batteries (with backlight

and Alarm functions OFF)

Manual Data Memory Capacity 99 records

Auto Datalogging Capacity 16,200 records in up to 99 data sets

Operating Temperature Range 5°C to 50°C (41°F to 122°F)

Storage Temperature Range -10°C to 60°C (-14°F to 140°F)

Operating Humidity Range 10%RH to 90%RH, non-condensing

Storage Humidity Range 10%RH to 90%RH, non-condensing

Dimensions 158 (L) x 72(W) x 35(H) mm (6.22” x 2.83” x 1.38”)

Weight 255g (0.56 lbs) approx. (including batteries)

Accessories Instruction Manual, Batteries, AC Adaptor, Software CD

ROM, and PC Interface Cable

CO2 Specifications

Sensing Range 0 to 6000ppm

Sensing Resolution 1ppm

Accuracy 3% of reading or 50ppm, whichever is greater

@ 101.4 kPa (29.92 inHg) and @ 25°C (77°F)

Sensing Method Dual wavelength detector with non- dispersive infrared

(NDIR) sensor

Gas Sampling Mode Diffusion type

Warm up time 10 seconds

Response time < 10 minutes in still air

Temperature Coefficient Add 0.36% of reading per °C (0.2% of reading per °F)

when deviating from calibration temperature

Temperature & Humidity Specifications

Relative Humidity Air Temperature

Dew Point and Wet Bulb are calculations

Range 10% ~ 95% RH -20°C ~ +60°C (-4°F ~ +140°F)

Resolution 0.1% RH 0.1°C (0.1°F)

Accuracy 3%RH @ 25°C (77°F), 30~95%RH)

5%RH @ at 25°C (77°F), 10~30%RH) 0.5°C (0.9°F)

Sensor type Precision capacitance sensor Thermistor

Response time 45%RH95%RH≦1min

95%RH45%RH≦3min 10°C (18°F) / 2sec

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