EXTECH CO220 CO2 Monitor and Datalogger User Manual

: June 4, 2024
: EXTECH

Table of Contents

Introduction
Descriptions
Operation
CO2 MEASUREMENT CONSIDERATIONS
Setup Mode
Automatic Baseline (ABC) Calibration
Maintenance
Specifications
Troubleshooting
CO2 Levels and Guidelines
Two-year Warranty
Calibration and Repair Services
Contact Customer Support
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

CO220 CO2 Monitor and Datalogger
User Manual

EXTECH CO220 CO2 Monitor and Datalogger

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

1. CO2 reading	6. ESC – MEM button
2. Relative Humidity Reading	7. SELECT – RECALL button
3. Air Temperature Reading	8. C/F – %RH button
4. Time/Date Display	9. CO2 button
5. SET button	10. AC adaptor jack

NOTE: CO2, Temperature, and RH sensors on the rear of the instrument

DISPLAY SYMBOL DESCRIPTIONS

| 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
ºC/ºF – %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 (ºC/ºF)

The change in the displayed temperature units of measure:

Press and hold the SET button
While holding the SET button, press the ºC/ºF button
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.

EXTECH CO220 CO2 Monitor and Datalogger - DISPLAY
PAGES

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 reading 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 the 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 ºC/ºF-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 the 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 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 the diagram below.

EXTECH CO220 CO2 Monitor and Datalogger - Alarm

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	1ppm	± (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 buildings should not exceed 1000ppm.
OSHA: 5000ppm: Time-weighted average over five 8-hour work days 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 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.