Extech Instruments EA80 User manual

User's Guide
Indoor Air Quality Meter/Datalogger
Model EA80

EA80 V2.1H 11/06
2
Ø 2.5

EA80 V2.1H 11/06
3
Preparation for Use
Power Supply
The meter is powered by six AAA-size alkaline batteries or an AC adapter.
Installing the Batteries
Insert six AAA-size batteries as indicated by the diagram located on the inside of the
battery compartment.
When the battery voltage drop below the operating voltage, the “ +” indicator will
be displayed indicating that the batteries need to be changed.
AC Adapter
The AC adapter allows you to power the meter from a 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 gas inlet port and gas exhaust are not blocked.
Operation
Note: Do not hold the instrument close to your face. Exhaled CO2will affect
the accuracy of the reading.
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 on the top of the meter itself.
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 needs about 10 minutes to
stabilize in still air, after that the readings can be
considered accurate. Moving the meter may
decrease this stabilization time.
4. Primary display shows the CO2 reading. Secondary
display shows temperature reading. Third display shows %RH.

EA80 V2.1H 11/06
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Humidity Measurement
1. Press the “ ” button to power on the meter.
2. The display will show the humidity reading value (% 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 on the meter.
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 on the meter.
2. Press “ 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 “ DEW ” button again to exit dew point temperature reading.
Wet Bulb Temperature Measurement
1. Press the “ ” button to power on the meter.
2. Press “ 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 “WET” button again to exit the display.

EA80 V2.1H 11/06
5
MAX
CO 2
ppm
d-h
m:s
8
MIN
CO 2
ppm
d-h
m:s
CO 2
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 CO2reading 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 second.
SET MAX
MIN
ALM
R
M
Err
INTV
Err
CO 2
ppm
ppm
%RH
d-h
CO 2
DEW
WET
°C°F
ppm
CO 2
m:s
8888
8888 8888
88
CAL

EA80 V2.1H 11/06
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SET
ALM
CO 2
ppm
ppm
CO 2
ppm
CO 2
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.
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
Press “ALARM” button to turn on the alarm function, “ALM” is displayed.
When the CO2value is below the low limit value, the meter displays “” mark and
beeps.
When the CO2value exceeds the high limit value, the meter displays “” and beeps.
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 the 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
R
M
Err
INTV
Err
CO 2
ppm
ppm
%RH
d-h
CO 2
DEW
WET
°C°F
ppm
CO 2
m:s
8888
8888 8888
88
CAL

EA80 V2.1H 11/06
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Manual Dataogging
Storing readings
Press " MEM " button. LCD will display " M" and the
memory address number. Total
memory size is 99 readings.
Viewing readings.
Press " READ " button to enter READ mode. The LCD
will display " R" and the memory address number.
Press " " or " " button to scroll through stored readings
Press " ↵" enter button to exit this mode.
Deleting stored data
Press “ SET ” button three times, the LCD will display “ CLr ” and enter the clear
memory mode.
Press “↵” button to clear the all manually stored readings.
If you wish not to clear the memory press “ SET ” button two times then press “↵” button
to exit the clear memory mode.
Auto Datalogging
Setting interval time
Press “SET” button two times, the “INTV” mark is displayed and enter to the setting
interval time mode.
Press “” or “” button to select desired interval time from 1 second to 255 seconds.
Press “↵” button to store the setting value and exit this mode.
Auto Datalogging mode
Press and hold “MEM” button for two seconds (3 beeps), the LCD will display “ ¯”and
the memory location.
“M” will flash each time a recording is made
The maximum memory capacity is 20,000 recordings and that can be divided into 99
sets.
Press “↵” button to exit this mode and stop recording.
Deleting Logged Data
Press “SET” button four times, the “CLr” and “ ¯” mark will be displayed
Press “↵” button to clear the auto datalogged memorized data and exit this mode.
If you choose not to clear the memory, press “SET” button again then press “↵” button to
exit the clear memory mode.
SET MAX
MIN
ALM
R
M
Err
INTV
Err
CO2
ppm
ppm
%RH
d-h
CO 2
DEW
WET
°C°F
ppm
CO 2
m:s
8888
8888 8888
88
CAL

EA80 V2.1H 11/06
8
Calibration
CO2 Calibration
1. Press “ ” button 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 “◄” button to select digits to adjust (flashing).
5. Press “▼” or “▲”button to adjust the display to the reference value.
6. Press “↵” to store the value and exit the calibration mode.
Humidity Calibration
1. Press “ ” button 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 “▲”button to adjust the display to the reference value.
5. Press “↵” to store the value and exit the calibration mode.
Temperature Calibration
1. Press “ ” button 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 “▲”button to adjust the display to the reference value.
5. Press “↵” to store the value and exit the calibration mode.

EA80 V2.1H 11/06
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Specifications
Display : LCD triple display.
Display Rate : One time per second.
Low Battery Indication : The “ +” is displayed when the battery voltage drops below
the operating voltage.
Power Supply : Six (6) AAA-size alkaline batteries.
or Regulated AC adapter.
Battery Life : Approx. 8 hours by using alkaline batteries (without
backlight or Alarm function). If datalogging over a long
period of time, use an AC adapter.
Manual Data Memory Capacity : 99 sets.
Auto Datalogging Capacity ; 20,000 sets (maximum 99 blocks)
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)x72(W)x35(H)mm, (6.22”x2.83”x1.38”)
Weight : approx. 255g (including batteries)
Accessories : Instruction Manual, Battery, AC Adaptor, Software CD
ROM & RS232 Cable.
CO2 Specifications :
Sensing Range : 0 to 6000ppm
Sensing Resolution : 1ppm
Accuracy : @ 101.4 kPa (29.92 inHg) and @ 25°C(77°F)
±3% of reading or ±50ppm, whichever is greater.
Sensing Method : Dual wavelength detector with non- dispersive infrared
(NDIR) sensor.
Gas Sampling Mode : Diffusion.
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)
away from calibration temperature.
Temperature & Humidity Specifications :
Relative Humidity Temperature
Range 10% ~ 95%RH. -20℃~+60°C/-4℉~+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 V2.1H 11/06
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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 battery cover
3. Replace the batteries observing polarity
4. Affix the battery cover and secure the rear screws.
RS-232 Interface, Software Installation and Operation
Software operational instructions are located on the software disc.