Extech Instruments CO200 User manual

User's Guide
CO2Monitor

Model CO200
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2 CO200-EU-EN-V1.1-11/11
Introduction
Congratulations on your purchase of this Model CO200 Carbon Dioxide Meter. This
meter measures CO2level, air temp., 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. CO2concentration in ppm
2. Date and Time
3. Air Temperature
4. % Relative Humidity
Symbols
ppm CO2value
GOOD CO2air quality level
NORMAL CO2l air quality level
POOR CO2air quality level
Air Temp Air Temperature
Humidity % Relative Humidity
°C or °F Celsius or Fahrenheit
MAX/MIN Maximum or Minimum reading
Relay activated
Controls
SET Enters setup mode.
Saves and finishes settings.
ESC Exits setup page/mode.
Terminates during CO
2 calibration.
RESET Press to clear the MAX/MIN. -
Terminates during RH calibration.
▲Selects mode or increases value in setup
MIN/MAX▼Activates MAX, MIN function.
Enters CO
2 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
2 , 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 30 sec for CO2
sensor to respond and 30 minutes for RH.
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.
ALARM & OUTPUT
The meter features an audible alarm which will give warnings when the CO2concentration
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 CO2level goes
over the upper limit. The audible alarm can be stopped by pressing any key or it
automatically stops when CO2reading 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

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3
RELAY OUTPUT
The meter is designed with a relay for connection to an external indicating or controlling
device. When CO2readings go over the upper limit the relay closes. The relay will open
again when CO2readings fall below the lower limit. The relay output port requires a 2.5mm
STEREO phone jack plug. The relay is: 1A 30VDC/0.5A 125VAC.
1. AC adaptor input (5VDC)
2. Alarm Relay output
3. Phone plug wiring
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.
P1.1CO2ALARM: GOOD LEVEL
When entering the setup mode, P1.0and “CO2” are displayed on the LCD. Press the SET
button again to go into P1.1for setting the CO2upper limit for the GOOD level. The current
set value will be blinking on the display.
Press the ▲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 P1.2for setting the upper NORMAL limit. Press the ESC button to exit without
saving the setting.
P1.2CO2ALARM: NORMAL LEVEL
P1.2is used for setting the CO2upper limit for the NORMAL level. The current set value
will be blinking on the display.
Press the ▲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 P1.3for setting the upper POOR limit. Press the ESC button to exit without
saving the setting.

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P1.3CO2ALARM: BEEP ALARM
P1.3is used for setting the CO2upper limit for the BEEPER ALARM level. The current set
value will be blinking on the display.
Press the ▲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
P1.0. Press the ESC button to exit without saving the setting.
P2.0TEMPERATURE SCALE
Press the ▲button in P1.0mode to access P2.0for setting the temperature scale.
Press the SET button to go into the P2.1setting mode. The °C or °F will blink.
Press the ▲button to change the units. Press the SET button to confirm theton.etting or
press the ESC button to exit without saving and return to P2.0.
P3.0REAL TIME CLOCK
Press the ▲button in P1.0twice to access P3.0for setting up real time clock. Press the
SET button and the meter goes into P3.1with blinking year in the lower left display. To
change the year, press the ▲button or the MIN/MAX▼button. Press the SET button to
save the setting and then enter P3.2or press the ESC button return to P3.0without saving
the setting.
Press the ▲button P3.1to access P3.2. The current month setting will blink. To change
the month, press the ▲button or the MIN/MAX▼button. Press the SET button to save the
setting and then enter P3.3or press the ESC button return to P3.0without 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. 0 RESET
Press the▲button in P1.0three times to access P4.0to reset the meter to default
settings. Press the SET and the meter will go to P4.1 with a blinking “No”. Press the ▲
to switch the status then press either the ▲button to save the settings or the ESC
button to exit without saving the settings.
Default settings:
Parameter Default
P1. 1 700ppm
P1. 2 1000ppm
P1. 3 1000ppm
P2. 1 ° C
P4. 1 No

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Calibration
CO2CALIBRATION
The meter is calibrated to a standard 400ppm CO2concentration at the factory
NOTE: When the accuracy becomes a concern or after a year of use, return the meter to
Extech for a standard calibration.
CAUTION: Do not calibrate the meter in an atmosphere of unknown CO2concentration.
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 CO2reading detected during
7.5 days continuous monitoring (power on). It assumes that the area being tested receives
fresh air with a CO2level of approximately 400ppm at some period of time during the
seven days. It is not suitable to use desktop CO2in closed areas with consistently
high CO2levels 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 CO2level is approximately 400 ppm. Do not calibrate on a rainy
day because high humidity will affect the CO2level in air.
Do not calibrate in places crowded with people or close to where high CO2concentrations
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 more than 1 second to enter CO2calibration 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.

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Specifications
Function Range Resolution Accuracy
CO20 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
Relay 1A 30VDC/0.5A 125VAC
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
Dimensions / Weight 117x102x102mm (4.6x4x4”); 204g (7.2 oz.)
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.

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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:
CO2Display
E01 CO2sensor is damaged Send back for repair
E02 CO2reading is under the
lower limit Re-calibrate the meter, if it still appears, return for repair
E03 CO2reading 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 CO2senor
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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CO2Levels 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: CO2concentration 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 CO2at
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.
Copyright ©2010 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any form.