EXTECH CO2 Monitor and Datalogger CO220 User Manual
- June 6, 2024
- EXTECH
Table of Contents
- Introduction
- FEATURES
- Descriptions
- PUSH-BUTTON DESCRIPTION
- Operation
- CO2 MEASUREMENT CONSIDERATIONS
- CHANGE THE TEMPERATURE UNITS ( oo C/ F)
- CO2 DISPLAY PAGES
- TIME-WEIGHTED AVERAGE (TWA)
- VENT.R (CO2-based demand-controlled ventilation)
- CHANGING THE 2ND TIER DISPLAY COMBINATION
- DATALOGGER MEMORY 99 READINGS
- Setup Mode
- High CO2 Alarm
- Automatic Baseline (ABC) Calibration
- Maintenance
- Specifications
- Troubleshooting
- CO2 Levels and Guidelines
- Two-year Warranty
- Calibration and Repair Services
- Contact Customer Support
- Read User Manual Online (PDF format)
- Download This Manual (PDF format)
USER MANUAL
CO2 Monitor and Datalogger
Model CO220
Additional User Manual Translations available
at www.extech.com
Introduction
Congratulations on your purchase of the Model CO220 Carbon Dioxide Meter. This
meter measures CO2 concentration, air temperature, and relative humidity. The
CO200 includes a 99 Memory Datalogger for storing and retrieving readings with
date and time-stamping.
The audible alarms make this is an ideal instrument for indoor air quality
(IAQ) diagnostics. Carbon dioxide (CO2) is a gaseous component of the earth’s
atmosphere.
The concentration of CO2 in natural ambient air is approximately 0.04% or
400ppm. 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.
FEATURES
- Extra Large LCD simultaneously displays CO2 Level, Air Temperature, & Relative Humidity
- Displayed Calendar Clock.
- Six (6) icons indicate indoor air quality levels (350 / 450 / 700 / 1000 / 1250 / 5000ppm)
- Stable NDIR sensor for CO2 detection
- Automatic Baseline Calibration (ABC) function
- Audible high CO2 concentration alarm with a selectable high alarm threshold
- Dew Point and Wet Bulb temperature measurements
Descriptions
METER
- CO2 reading
- Relative Humidity Reading
- Air Temperature Reading
- Time/Date Display
- SET button
- ESC – MEM button
- SELECT – RECALL button
- C/F – %RH button
- CO2 button
- AC adaptor jack
NOTE: CO2, Temperature, and RH sensors on the rear of the instrument
DISPLAY SYMBOL DESCRIPTIONS
ppm CO2 concentration unit of measure
350ppm to 450ppm
450ppm to 700ppm
700ppm to 1000ppm
1000ppm to 2500 ppm
2500ppm to 5000ppm
5000ppm and above
Air Temp Air Temperature
TWA Time Weighted Average (8 hrs)
STEL Short-Term Exposure Limit (15-minute weighted average)
IPS% Liters per second per person cfm/p Cubic feet per minute per person
WB Wet Bulb temperature
DP Dew Point temperature
MAX/MIN Maximum or Minimum reading
PUSH-BUTTON DESCRIPTION
SET Enter setup mode Save and confirm settings
ESC – MEM Exit setup and programming pages End a calibration session Memory
Datalogger (99 points)
SELECT/RECALL Select/Recall and Clear Datalogger Memory Readings
oo C/ F – %RH Temperature/Relative Humidity Modes/Temperature Unit changing
CO2 CO2 mode page stepping
Operation
POWERING THE INSTRUMENT
Power the unit by plugging the AC adaptor into the meter and into an AC
source. The meter will switch ON with a short beep.
Please use an appropriate power source: 100 to 240VAC (50-60Hz). The AC
adaptor’s output voltage is 7.5 to 9.0V and its output current is 0.5A. Use of
3 rd
party AC adaptor can damage the meter.
The LCD will display the current CO2 concentration, air temperature, relative
humidity, date, and time (date and time toggle every 10 seconds). Six facial
icons indicate the indoor air quality level and appear on the top-tier display
area (see figure at right and the section titled Display Symbols earlier in
this guide for additional details).
CO2 MEASUREMENT CONSIDERATIONS
The meter starts measuring when powered ON and updates readings every 6
seconds.
Response time is 10 seconds for CO2 and 2 seconds for Relative Humidity.
If the environmental conditions change (for example, a low to high-temperature
swing) please allow 30 seconds for CO2 readings and 30 minutes for Relative
Humidity readings to stabilize.
NOTE: Do not hold the meter close to the mouth or any other source of
CO2.
CHANGE THE TEMPERATURE UNITS ( oo C/ F)
The change the displayed temperature units of measure:
- Press and hold the SET button
- While holding the SET button, press the F button o o C/
- Repeat these steps to change the units again
CO2 DISPLAY PAGES
Press the CO2 button to change the CO2 display page on the top-tier LCD area. The pages are shown below for CO2, Max-Min, TWA, STEL, IPS%, and cfm/p.
TIME-WEIGHTED AVERAGE (TWA)
TWA is Time Weighted Average (8 hours); the meter updates the reading every 60 seconds. If the meter has been powered on for less than 8 hours, the TWA value will be the weighted average of readings taken since the unit was powered ON.
SHORT-TERM EXPOSURE LIMIT (STEL)
STEL is the Short-Term Exposure Limit (15 minutes weighted average); the meter
updates readings every 60 seconds. If the meter has been powered on for less
than 15 minutes, the STEL value shows the weighted average of readings taken
since the unit was powered ON.
LPS%
LPS% represents Liters per second per person.
CFM/P
CFM/P represents Cubic Feet per Minute per person.
VENT.R (CO2-based demand-controlled ventilation)
CO2 -based demand-controlled ventilation refers to the practice of using carbon dioxide concentrations as an indicator for a per-person ventilation rate. In this context, CO2 is monitored as a byproduct of respiration rather than as an indoor contaminant. The rate at which people produce CO2 varies with diet and health, as well as with the duration and intensity of physical activity. The more exertion an activity entails, the more carbon dioxide is produced.
CHANGING THE 2ND TIER DISPLAY COMBINATION
Repeated presses of the C/F-RH% button step through the following combinations of parameters:
- Humidity + Air Temperature
- Humidity + Web Bulb Temperature
- Humidity + Dew Point Temperature
MAX/MIN MEMORY
The meter automatically records Maximum and Minimum readings when the meter is
switched ON. In the normal mode, press the CO2 button to see the maximum and
minimum levels of CO2. While viewing the Max or Min reading, press and hold
the SELECT/RECALL button to reset the MAX or MIN memory. The “Clr” icon will
appear for 2 seconds and the display will begin tracking new MAX and MIN
readings.
DATALOGGER MEMORY 99 READINGS
The user can store up to 99 CO2 readings in memory for later recall. Press the
ESC-MEM button momentarily to save the current CO2 reading with a date/time
stamp. The meter will emit a short beep and the memory location number will
replace the RH reading for 2 seconds before returning to the RH reading.
Once the memory is full, the meter will overwrite the first data point stored
and continue to overwrite existing readings as new readings are stored.
To recall the data use the SELECT/RECALL button. The middle tier display will
show the memory location number and the top tier display will show the stored
reading in ppm. The bottom tier display shows the date/time stamp for the
displayed reading.
Press the c/F-RH% button momentarily to return to the normal operating mode.
Press and hold the SELECT/RECALL button to reset the 99 point memory bank, the
“Clr” icon will appear for 2 seconds before returning to the normal display
mode.
Setup Mode
Press and hold the SET button for 2 seconds from the normal mode of operation
to access the SETUP mode.
Setting Year
When the two-digit year number appears, use the SELECT button to increase the
year value. Press SET to move to the next setting
Setting Month
When the two-digit month appears on the LCD press SELECT to increase the
month. Press SET to save and move to the next setting.
Setting Date
When the two-digit date appears on LCD press SELECT to increase the date.
Press the SET button to save and move to the next setting.
Setting Hours
When the two-digit hour appears on the LCD press SELECT to increase the hour.
Press SET to move to the next setting.
Setting Minutes
When the two-digit minute’s value appears on the LCD press SELECT to increase
the minutes. Press SET to move to the next setting.
High CO2 Alarm
In the SETUP mode, after the date and time are set (as detailed above) the A-on icon will be displayed in the upper display. Press the SELECT button to switch the alarm ON or OFF. See diagram below.
When the alarm is ON, press the SET button to save the setting and move to the
CO2 alarm setting.
The meter shows CO2 1000 ppm as the default alarm. To change the High Alarm,
press the SELECT button to increase the value (press and hold the SELECT
button to scroll faster). Press SET to save and press ESC to return to the
normal operating mode.
Now when the reading exceeds the programmed limit the meter will beat once per
second. The meter will sound the alarm until the reading does not exceed the
alarm limit, the user changes the alarm limit value, the alarm is switched off
as described above, or the meter power is removed.
Automatic Baseline (ABC) Calibration
ABC (Automatic Baseline Calibration) establishes a baseline calibration to
eliminate the zero drift of the infrared sensor. The ABC function is always ON
when the meter is ON. ABC is designed to calibrate the meter at the minimum
CO2 reading detected during 7.5 days of continuous monitoring (with power on).
It assumes that the area being tested receives fresh air with a CO2 level of
approximately 400ppm at some period of time during the seven days. It is not
suitable to use desktop CO2 in closed areas with consistently high CO2 levels
24 hours a day.
NOTE: After the meter has been powered for one day, press the CO2 button to
determine if the environment is suitable for the automatic baseline
calibration.
Maintenance
Cleaning and storage
- The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use solvents or abrasives.
- Store the meter in an area with moderate temperature and humidity.
Specifications
Function
| Range| Resolution|
Accuracy
---|---|---|---
CO2| 0 to 9999ppm| 1PPrn| ± (5%rdg +50ppm) from 0 to 2000ppm
Temperature| 14 to 140°F
(-10 to 60°C)
| 0.1°| 1.0°F (±0.6°C)
Relative Humidity| 0.1 to
99.9%
| 0.1 %| ± 3% (10 to 90%) ± 5% (< 10% or > 90%)
@25°C
Display
3-tier Multi-function LCD
Sensor Type
CO2: NDIR (non-dispersive infrared) technology Humidity: Capacitance sensor;
Temperature (air): Thermistor
Datalogging
99 points
Operating Conditions
32 to 122°F (0 to 50°C); 5 to 80% RH
Storage Conditions
-4 to 122°F (-20 to 50°C); 5 to 90% RH
Power Supply
9VDC universal plug adapter
Dimensions
6.1 x 3.4 x 3.2” (155 x 87 x 81.5mm)
Weight
6.2 oz. (178g)
Troubleshooting
Meter won’t power ON| Check to see that the adaptor is properly
plugged in.
---|---
Slow response| Check that the airflow channels on the rear of the meter
have clearance.
Error Codes:
E-1 | The CO2 sensor is damaged | Return for repair |
---|---|---|
E-2 | The humidity sensor is damaged | Return for repair |
E-3 | The temperature sensor is damaged | Return for repair |
E-4 | Operating |
temperature is too high
| Put the meter at typical room temperature for 30 minutes, if the problem
persists, return for repair
E-5| Operating
temperature is too low
| Put the meter at typical room temperature for 30 minutes, if the problem
persists, return for repair
E-6| Hardware failed| Return for repair
CO2 Levels and Guidelines
IMPORTANT LIABILITY NOTE
The CO2 guideline data provided here is meant for informational purposes only
and is not intended as a direct recommendation from Extech Instruments or FLIR
Systems. The user must take full responsibility when determining how this
information is to be used.
Non-Enforced Reference levels
-
250 – 350 ppm – background (normal) outdoor air level
-
350- 1,000 ppm – typical level found in occupied spaces with good air exchange.
-
1,000 – 2,000 ppm – a level associated with complaints of drowsiness and poor air.
-
2,000 – 5,000 ppm – a level associated with headaches, sleepiness, and stagnant, stale, stuffy air. Poor concentration, loss of attention, increased heart rate, and slight nausea may also be present.
-
>5,000 ppm – Exposure may lead to serious oxygen deprivation resulting in permanent brain damage, coma, and even death.
Regulatory exposure limits -
ASHRAE Standard 62-1989: 1000ppm: CO2 concentration in the occupied building should not exceed 1000ppm.
-
OSHA: 5000ppm: Time-weighted average over five 8-hour workdays should not exceed 5000ppm
-
Building bulletin 101 (Bb101): 1500ppm. UK standards for schools say that CO2 averaged over the entire day (i.e. 9 am to 3.30 pm) should not exceed 1500ppm.
-
Germany, Japan, Australia, UK: 5000ppm, 8 hours weighted average occupational exposure limit is 5000ppm.
Two-year Warranty
FLIR Systems, Inc. warrants this Extech brand instrument to be free of defects in parts and workmanship for two years from the date of shipment (a six-month limited warranty applies to sensors and cables). To view the full warranty text please visit http://www.extech.com/support/warranties.
Calibration and Repair Services
FLIR Systems, Inc. offers calibration and repair services for the Extech brand products we sell. We offer NIST traceable calibration for most of our products. Contact us for information on calibration and repair availability, refer to the contact information below. Annual calibrations should be performed to verify meter performance and accuracy. Product specifications are subject to change without notice. Please visit our website for the most up-to- date product information: www.extech.com.
Contact Customer Support
Customer Support Telephone List: https://support.flir.com/contact
Calibration, Repair, and Returns:
repair@extech.com
Technical Support: https://support.flir.com
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All rights reserved including the right of reproduction in whole or in part in
any form
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