Extech Instruments CO210 User manual

User's Guide

CO2 Monitor and Datalogger

Model CO210

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Introduction

Congratulations on your purchase of this Model CO210 Carbon Dioxide Meter. This meter

measures and datalogs CO2 level, air temperature, humidity, date and time. With visible and

audible alarms, this is an ideal instrument for indoor air quality (IAQ) diagnosis. This meter is

shipped fully tested and calibrated and, with proper use, will provide years of reliable service.

Meter Description

Meter

1. CO2, Temp and RH sensors (rear)

2. LCD display

3. Controls

LCD Display

1. CO2 concentration in ppm

2. Date and Time

3. Air Temperature

4. % Relative Humidity

Symbols

ppm CO2 value

GOOD CO2 air quality level

NORMAL CO2 l air quality level

POOR CO2 air quality level

Air Temp Air Temperature

Humidity % Relative Humidity

°C or °F Celsius or Fahrenheit

MAX/MIN Maximum or Minimum reading

Controls

SET Enters setup mode.

Saves and finishes settings.

ESC Exits setup page/mode.

Terminates calibration / Datalogging

RESET Press to clear the MAX/MIN. -

Terminates during RH calibration.

LOG Selects mode or increases value in setup

Start Datalogging

MIN/MAX Activates MAX, MIN function.

Enters CO

calibration with

SET

and

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Operation

POWER ON

Plug in the adaptor and the meter turns on automatically with a short beep. If the voltage is

too high or low, “bAt“ will display on the LCD and an LED will flash.

The LCD will display current CO

, temp., humidity, date and time. The air quality level is

displayed as well

TAKING MEASUREMENT

The meter starts measurements when powered on and updates readings every second. If the

operating environment changes (ex. from high to low temp.), it takes 2 minutes for the CO2sensor

to respond and 10 minutes for RH change.

NOTE: Do not hold the meter close to your mouth or any other source of CO2.

MAX/MIN

In the normal mode, press the MIN/MAX button to see the minimum and maximum of CO2,

Temperature and Humidity. Each press of MIN/MAX button will sequence through the MIN, MAX

display and then returns to normal mode.

Press and hold the RESET button for more than 1 second to clear the minimum and maximum

value from memory.

DATA LOGGING

The meter can record readings of CO

, temperature and humidity for long time environment

monitoring. The memory capacity is 15999 points (5,333 RH, Temperature and CO

records) .

The sample rate is adjustable from 1 second to 4 hours 59 minutes and 59 seconds.

After the sampling rate is selected, press the LOG button for 2 seconds in the normal

mode to start logging. The green LED light blinks to indicate the logging status and the LCD

main display will alternate between real time CO

value and “rEC”. The lower displays are

the real time temperature, humidity and clock.

To terminate data logging, press the

ESC

button

” for 2 seconds. The LED will stops blinking

and the LCD main display will alternate between real time CO

value and “End”. Hold down

the ESC button for 2 seconds again and it the meter returns to normal measurement mode.

Minimum and Maximum recall continues working during logging.

The memory is cleared whenever a new logging session is activated.

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ALARM

The meter features an audible alarm which will give warnings when the CO2 concentration exceeds

the set limit. There are two settable limits, an upper limit that initiates the alarm and a lower limit to

stop the alarm.

The meter emits beeps and displays the fan icon on the display when the CO2 level goes over the

upper limit. The audible alarm can be stopped by pressing any key or it automatically stops when

CO2 reading falls below the lower limit.

If the beeper is temporarily shut down, it will sound again when readings fall below lower limit and

then go over the upper limit again or it the user presses the RESET button for more than 1 second

to activate it.

The fan icon keeps flashing when beeps are manually shut down. It stops only when readings fall

under the lower limit

SETUP

(Alarm level, Temperature scale, Real Time clock)

Hold the SET button, in the normal mode, for more than 1 second to enter the setup mode.

P1.1 CO2 ALARM: GOOD LEVEL

When entering the setup mode, P1.0 and “CO2” are displayed on the LCD. Press the SET button

again to go into P1.1 for setting the CO2 upper limit for the GOOD level. The current set value will

be blinking on the display.

Press the LOG/ or MIN/MAX button to increase or decrease the value. Each press adjusts in

100ppm increments. The alarm range is 0 to 700ppm.

When the value has been set, press the SET button to confirm the GOOD limit and to proceed to

P1.2 for setting the upper NORMAL limit. Press the ESC button to exit without saving the setting.

P1.2 CO2 ALARM: NORMAL LEVEL

P1.2 is used for setting the CO2 upper limit for the NORMAL level. The current set value will be

blinking on the display.

Press the LOG/ or MIN/MAX button to increase or decrease the value. Each press adjusts in

100ppm increments. The alarm range is 700 to 1000ppm.

When the value has been set, press the SET button to confirm the NORMAL limit and to proceed to

P1.3 for setting the upper POOR limit. Press the ESC button to exit without saving the setting.

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P1.3 CO2 ALARM: HIGH ALARM

P1.3 is used for setting the CO2 upper limit for the BEEPER ALARM level. The current set value

will be blinking on the display.

Press the LOG/ or MIN/MAX button to increase or decrease the value. Each press adjusts in

100ppm increments. The alarm range is 1000 to 5000ppm.

When the value has been set, press the SET button to confirm the limit and to proceed to P2.0 or

press the ESC button to return to P1.0.

P2.0 TEMPERATURE SCALE

Press the LOG/ button in P1.0 mode to access P2.0 for setting the temperature scale.

Press the SET button to go into the P2.1setting mode. The °C or °F will blink.

Press the LOG/ button to change the units. Press the SET button to confirm the setting or press

the ESC button to exit without saving and return to P2.0.

P3.0 REAL TIME CLOCK

Press the LOG/ button in P1.0 twice to access P3.0 for setting up real time clock. Press the SET

button and the meter goes into P3.1 with blinking year in the lower left display. To change the year,

press the LOG/ button or the MIN/MAX button. Press the SET button to save the setting and

then enter P3.2 or press the ESC button return to P3.0 without saving the setting.

Press the LOG/ button P3.1 to access P3.2. The current month setting will blink. To change the

month, press the LOG/ button or the MIN/MAX button. Press the SET button to save the setting

and then enter P3.3 or press the ESC button return to P3.0 without saving the setting.

Repeat as above to finish the setting of P3.3 (Date), P3.4 (Hour) and P3.5 (Minute)

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P4.

RESET

Press the LOG/ button in P1.0 three times to access P4.0 to reset the meter to default settings.

Press the SET button and the meter will go to P4.1with a blinking “No”. Press the LOG/ to

switch the status then press either the SET button to save the settings or the ESC button to

exit without saving the settings.

If “Yes” is selected the meter defaults to the following settings:

Parameter Default

P1.

700ppm

P1.

1000ppm

P1.

1000ppm

P2.

P4.

P5.

SAMPLING RATE

Press the LOG/ button in P1.0 three times to access P5.0to set the logging sample rate. The

available range is 1 second to 4 hours 59 minutes. Press the SET button and the meter will go

to P5.1with blinking hour digits. To change the hour, press the LOG/ button or the MIN/MAX

button. Press the SET button to save the setting and then repeat the procedure for P5.2minutes and

P5.3 seconds. Press the ESC button return to P5.0 without saving the setting.

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Calibration

CO2 CALIBRATION

The meter is calibrated to a standard 400ppm CO2 concentration at the factory

NOTE: When the accuracy becomes a concern or after a year of use, return the meter to Extech for

calibration.

CAUTION: Do not calibrate the meter in an atmosphere of unknown CO2 concentration.

ABC (Automatic Baseline 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 turned on. ABC is designed

to calibrate the meter at the minimum CO2 reading detected during 7.5 days continuous monitoring

(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.

Manual Calibration

Manual calibration is suggested to be done outdoors on a sunny day with good ventilation and fresh

air where the CO2 level is approximately 400 ppm. Do not calibrate on a rainy day because high

humidity will affect the CO2 level in air.

Do not calibrate in places crowded with people or close to where high CO2 concentrations may exist

such as ventilating outlets or fireplaces.

Place the meter in the calibration site. Turn on the meter and hold down the SET, and

MIN/MAX buttons simultaneously for more than 1 second to enter CO2 calibration mode.

“400ppm” and “CO2” will blink while the calibration is in process.

The calibration will take about 30 minutes. When the calibration is complete, the blinking stops and

the meter returns to normal operation. To abort the calibration, press the RESET button for more

than 1 second.

Note: Keep away from any animal, human or plant which might affect the CO2 concentration during

the calibration.

Software

The Windows based pc software provided is used to set-up the datalogger, download data and to

view the data in graphical or text format. After installing the software, view the HELP file for

operational information.

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Maintenance

CLEANING AND STORAGE

1. The meter should be cleaned with a damp cloth and mild detergent when necessary. Do not use

solvents or abrasives.

2. Store the meter in an area with moderate temperature and humidity.

Specifications

Function Range Resolution Accuracy

CO2 0 to 9999ppm 1ppm ±(5%rdg +50ppm)

Temperature -10 to 60°C

14 to 140°F 0.1° ±0.6°C/0.9°F

Humidity 0.1 to 99.9% 0.1% ±3%(10 to 90%)

±5%(< 10% or > 90%)

Display LCD

Sensor Type CO2: NDIR (non-dispersive infrared) technology

Humidity: Capacitance sensor;

Temperature (air): Thermistor

Response CO2: <2min for 90% step change

Temp: <2min for 90% step change

%RH: <10min for 90% step change

Datalogging Up to 15999 points

Sample rate 1 second to 4 hours-59 minutes-59 seconds

Operating Conditions -10 to 60°C (14 to 140°F); < 90% RH non-condensing

Storage Conditions -20 to 60°C (-4 to 140°F); <99% RH non-condensing

Power Supply 5VDC (±10%), 500mA (AC adaptor supplied)

Dimensions / Weight 117x102x102mm (4.6x4x4”); 204g (7.2 oz.)

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TROUBLESHOOTING

Can’t power on: Check whether the adaptor is properly plugged in.

Slow response: Check whether the air flow channels on the rear of

the meter are blocked.

"BAt” and green LED keep

flashing:

The adaptor output voltage is too high or too low.

Please use the adaptor with correct output.

Error Codes:

CO2 Display

E01 CO2 sensor is damaged Send back for repair

E02 CO2 reading is under the

lower limit

Re-calibrate the meter, if it still

appears, return for repair

E03 CO2 reading is above the

upper limit

Put the meter in fresh air and wait for

5minutes, if it still appear, re-calibrate

the meter. If above two methods faile,

return for repair

E17 ABC mode of CO2 senor

has failed and might

cause wrong CO2

readings

Send back for repair

Temp

Display

E02 Air temp. measurement is

under the lower limit

Put the meter in regular room

temperature for 30 minutes, if it still

appears, return for repair

E03 Air temp. measurement is

over the upper limit

Put the meter in regular room

temperature for 30 minutes, if it still

appears, return for repair

E31 Temp. sensor or

measuring circuit is

damaged

Return for repair

Humidity

Display

E04 Air temp. measurement

has error code

Refer to temperature error code for

problem solving

E11 The RH calibration has

failed

Please return for repair

E34 RH sensor or measuring

circuit has failed

Return for repair

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CO2 Levels and Guidelines

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 - level associated with complaints of drowsiness and poor air.

2,000 – 5,000 ppm – 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 occupied building 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 at averaged

over the whole day (i.e. 9am to 3.30 pm) should not exceed 1500ppm.

Germany, Japan, Australia, UK: 5000ppm, 8 hours weighted average occupational exposure

limit is 5000ppm.

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