Extech Instruments EA80 Manuale utente

User Guide

Indoor Air Quality Meter/Datalogger

Model EA80

EA80-en-GB_v3.3 09/15

2.5

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

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

AC Adaptor 2.5mm mono

Plug

EA80-en-GB_v3.3 09/15

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 and gas exhaust 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.

EA80-en-GB_v3.3 09/15

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.

EA80-en-GB_v3.3 09/15

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 “△” 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

EA80-en-GB_v3.3 09/15

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.

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

EA80-en-GB_v3.3 09/15

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

EA80-en-GB_v3.3 09/15

Calibration

CO2 Calibration

1. Press “ ” to turn the meter on.

2. Place the probe in a known CO2reference 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.

EA80-en-GB_v3.3 09/15

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 Temperature

Range 10% ~ 95% RH -20°C ~ +60°C (-4°C ~ +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 / 2sec

EA80-en-GB_v3.3 09/15

Maintenance

Cleaning

Periodically wipe the case with a dry cloth or a damp cloth with mild detergent.

Do not use abrasives or solvents to clean this instrument.

Battery Replacement

When the “ ” symbol appears on the LCD, the six 1.5V ‘AAA’ must be replaced.

1. Turn the meter off

2. Remove the meter’s rubber protective jacket

3. Remove the flat-head screw at the rear of the meter

4. Remove the meter’s battery cover

5. Replace the batteries observing polarity

6. Affix the battery cover, secure the rear screw, and re-attach the meter’s rubber protective

jacket

You, as the end user, are legally bound (Battery ordinance) to return all used batteries

and accumulators; disposal in the household garbage is prohibited!

Bring used batteries / accumulators to the collection points in your community or

wherever batteries / accumulators are sold!

PC Interface, Software Installation and Operation

Software operational instructions are located on the software disc. Install the software by inserting

the disc in the PC CD-ROM drive and following the on-screen prompts. Open the Software manual

(PDF) and read the Installation and Operation instructions.

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