Extech Instruments CO220 Manual de usuario

USER MANUAL

CO2Monitor and Datalogger

Model CO220

Additional User Manual Translations available

at www.extech.com

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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 CO2in

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 CO2Level, 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 CO2detection

Automatic Baseline Calibration (ABC) function

Audible high CO2concentration alarm with selectable high alarm

threshold

Dew Point and Wet Bulb temperature measurements

3 CO220-en-US_V1.5 8/20

Descriptions

METER

1. CO2reading

2. Relative Humidity Reading

3. Air Temperature Reading

4. Time/Date Display

5. SET button

6. ESC –MEM button

7. SELECT –RECALL button

8. C/F - %RH button

9. CO2button

10. AC adaptor jack

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

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DISPLAY SYMBOL DESCRIPTIONS

ppm CO2concentration 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

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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

CO2CO2mode 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 3rd

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).

6 CO220-en-US_V1.5 8/20

CO2MEASUREMENT CONSIDERATIONS

The meter starts measuring when powered ON and updates readings

every 6 seconds.

Response time is 10 seconds for CO2and 2 seconds for Relative

Humidity.

If the environmental conditions change (for example, a low to high

temperature swing) please allow 30 seconds for CO2readings 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 the displayed temperature units of measure:

1. Press and hold the SET button

2. While holding the SET button, press the oC/oF button

3. Repeat these steps to change the units again

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CO2DISPLAY PAGES

Press the CO2button to change the CO2display 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.

8 CO220-en-US_V1.5 8/20

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, CO2is monitored as a byproduct of

respiration rather than as an indoor contaminant. The rate at which

people produce CO2varies 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

9 CO220-en-US_V1.5 8/20

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 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.

10 CO220-en-US_V1.5 8/20

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 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 minutes value appears on the LCD press SELECT to

increase the minutes. Press SET to move to the next setting.

High CO2Alarm

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.

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