EXTECH EA80 Indoor Air Quality Meter Datalogger User Manual
- June 13, 2024
- EXTECH
Table of Contents
EXTECH EA80 Indoor Air Quality Meter Datalogger User Manual
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
- Display
- Gas exhaust
- Gas inlet port (rear of meter)
- PC Interface jack
- AC adapter socket (9V, 300mA)
- Power Button
- Data Hold Button
- Backlight Button
- MX/MN Button
- SET Button
- ALARM button
- MEM (memory) button
- (Enter) button
- READ button
- TIME button
- °C/°F button
- DEW button
- WET button
- Temperature / Humidity sensor probe
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 CO2 will 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
- Press button to turn on the meter,
- The sensor requires a 30 second warm-up before displaying the CO2 measurement.
- 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.
- The primary display indicates the CO2 reading. The secondary display indicates temperature. The third display indicates %RH.
Humidity Measurement
- Press the ” Θ ” button to power the meter ON.
- The display will indicate the humidity reading (% RH) directly on the third display.
- Hold the probe in the air in the area to be tested. Do NOT immerse in liquid.
- Allow adequate time for readings to stabilize.
- Read the measurements on the LCD.
Temperature Measurement
- Press the ” ” button to power the meter ON.
- Press the °C/°F button momentarily to toggle the temperature units.
- The display will show the Temperature reading directly on the second display.
- Allow adequate time for readings to stabilize.
- Read the measurements on the LCD.
Dew Point Temperature Measurement
- Press the ” ” button to power the meter ON.
- Press the “DEW” button
- The display will show the Dew Point Reading on the second display.
- Allow adequate time for the readings to stabilize
- Read the measurements on the LCD.
- Press the “DEW” button again to exit the dew point temperature reading.
Wet Bulb Temperature Measurement
- Press the ” ” button to power the meter ON.
- Press the “WET” button
- The display will show the Wet Bulb Reading on the second display.
- Allow adequate time for the readings to stabilize
- Read the measurements on the LCD.
- Press the “WET” button again to exit the display.
CO2 Maximum and Minimum Recording Measurement
- 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.
- Press “TIME” button to enter time display mode. Displays 2 and 3 will indicate the time the maximum reading occurred.
- Press “MX/MN” button again. The “MIN” icon will appear with the minimum value and its stamp time.
- Press “MX/MN” button again. The “” icon will appear with the current value and current time.
- Press “MX/MN” button again cycle through the recorded MAX, MIN and current readings.
- Press “” button to exit this mode.
- Press “TIME” button exit the time display mode.
Data Hold
- Press the H button momentarily to freeze the displayed reading. The ‘H’ icon will appear on the upper left-hand side of the display.
- Press the H button again to return to normal operation (the ‘H’ hold icon will disappear).
Backlight
- Press the button to turn the backlight on or off.
- The backlight will turn off automatically after 30 seconds.
CO2 Alarm Operation
Setting the Alarm Limit Values
- Press “ALARM” button to turn on the alarm function, the “ALM” icon, and current value are displayed.
- 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.
- Press “▲” or “▼” button to set desired value.
- Press “▶” button to move the cursor to set the tens and ones digits.
- Press “▲” or “▼” button to enter the desired value.
- Press “▲” button to move the cursor to the hundred and thousand digits of the low limit value.
- Press “▲” or “▼” button to set desired value.
- Press “▶” button to move the cursor to move the cursor to set the tens and ones of the low limit value.
- Press “▲” or “▼” button to set desired value.
- To change any setting, press “▶” or “◀” button to move the cursor to desired high or low limit value position.
- 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 CO2 value is below the low limit value, the meter displays “▼” mark and beeps.
- When the CO2 value exceeds the high limit value, the meter displays “▲” and beeps.
- To exit the ALARM function, press “ALARM” button again.
Setting the Real Time Clock
-
Press “ALARM” button to turn on the alarm function, the “ALM” icon, and current value are displayed.
-
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.
-
Press “▲” or “▼” button to set desired value.
-
Press “▶” button to move the cursor to set the
tens and ones digits. -
Press “▲” or “▼” button to enter the desired value.
-
Press “▲” button to move the cursor to the hundred and thousand digits of the low limit value.
-
Press “▲” or “▼” button to set desired value.
-
Press “▶” button to move the cursor to move the cursor to set the tens and ones of the low limit value.
-
Press “▲” or “▼” button to set desired value.
-
To change any setting, press “▶” or “◀” button to move the cursor to desired high or low limit value position.
-
Press button to store these setting and exit this mode.
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.
Calibration
CO2 Calibration
- Press ” ” to turn the meter on.
- Place the meter in a known CO2 reference for 10 minutes.
- Press the “SET” button 5 times until “C-01” is displayed in the second display.
- Press “▶” or “◀” to select digits to adjust (flashing).
- Press “▼” or “▲” to adjust the display to the reference value.
- Press “” to store the value and exit the calibration mode.
Humidity Calibration
- Press ” ” to turn the meter on.
- Place the probe in a known humidity reference for 60 minutes.
- Press the “SET” button 6 times until “SET” and “CAL” are displayed on the LCD.
- Press”▼” or “▲” to adjust the display to the reference value.
- Press “” to store the value and exit the calibration mode.
Temperature Calibration
- Press ” ” to turn the meter on.
- Place the probe in a known temperature reference for 60 minutes.
- Press the “SET” button 7 times until “SET” and “CAL” are displayed on the LCD.
- Press “▼” or “▲” to adjust the display to the reference value.
- 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 www.extech.com for the latest version of the PC software and its operating system compatibility.
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
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.
- Turn the meter off
- Remove the meter’s rubber protective jacket
- Remove the flat-head screw at the rear of the meter
- Remove the meter’s battery cover
- Replace the batteries observing polarity
- Affix the battery cover, secure the rear screw, and re-attach the meter’s rubber protective jacket
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.
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