Extech Instruments | CO200 | User`s guide | Extech Instruments CO200 User`s guide

User's Guide
CO2 Monitor
Model CO200
Introduction
Congratulations on your purchase of this Model CO200 Carbon Dioxide Meter. This meter
measures CO2 level, 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.
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
Relay activated
Controls
SET
Enters setup mode.
Saves and finishes settings.
ESC
Exits setup page/mode.
Terminates during CO2 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 CO2, 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 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
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RELAY OUTPUT
The meter is designed with a relay for connection to an external indicating or controlling device.
When CO2 readings go over the upper limit the relay closes. The relay will open again when CO2
readings 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
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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 ▲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 ▲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: BEEP 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 ▲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.
P2.0 TEMPERATURE SCALE
Press the ▲ 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 ▲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 ▲ 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 ▲ 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 ▲ button P3.1 to 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 P3.3 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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P4.0 RESET
Press the▲button in P1. 0 three times to access P4.0 to 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
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
a standard 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 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.
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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
Relay
1A 30VDC/0.5A 125VAC
Operating Conditions
14 to 140°F (-10 to 60°C); < 90% RH non-condensing
Storage Conditions
-4 to 140°F (-20 to 60°C); <99% RH non-condensing
Power Supply
5VDC (±10%), ≥ 500mA
Dimensions / Weight
4.6x4x4” (117x102x102mm); 7.2 oz (204g))
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:
CO2 Display
E01
E02
E03
E17
CO2 sensor is damaged
CO2 reading is under the
lower limit
CO2 reading is above the
upper limit
ABC mode of CO2 senor
has failed and might
cause wrong CO2
readings
Send back for repair
Re-calibrate the meter, if it still
appears, return for repair
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
Send back for repair
Temp
Display
E02
Air temp. measurement is
under the lower limit
E03
Air temp. measurement is
over the upper limit
E31
Temp. sensor or
measuring circuit is
damaged
Put the meter in regular room
temperature for 30 minutes, if it still
appears, return for repair
Put the meter in regular room
temperature for 30 minutes, if it still
appears, return for repair
Return for repair
Humidity
Display
E04
E11
E34
Air temp. measurement
has error code
The RH calibration has
failed
RH sensor or measuring
circuit has failed
Refer to temperature error code for
problem solving
Please return for repair
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.
Copyright © 2013 FLIR Systems, Inc. All rights reserved including the right of reproduction in whole or in part in any form ISO‐9001 Certified www.extech.com 10
CO200-EU-EN v1.2 08/13
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