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Extech Instruments CO250, User Manual, Page: 8 / 9

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Extech Instruments CO250 User Manual Download Page 8

CO250-EU V1.2 6/09

8

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 (refer to the

operating and storage range in the specifications chart earlier in this manual).

TROUBLESHOOTING

Can’t power on

Press

for more than 0.3 seconds and try again. Check that the batteries have good

contact and the correct polarity or that the AC adaptor is properly connected.

Slow response

Check whether the air flow channels on the rear of the meter are blocked.

Error messages

E01: CO

2

sensor damaged.

E02: The value is under range.
E03: The value is over range.
E04: The original data error results in this error (DP, WB)
E07: Too low voltage to measure CO

2

, replace batteries or use an adaptor.

E11: Retry humidity calibration.
E17: Retry CO

2

calibration.

E31: Temperature sensor damaged.
E34: Humidity sensor damaged.

Summary of Contents for CO250

Page 1: ... Model CO250 Meter This meter measures CO2 Carbon Dioxide levels air temp dew point wet bulb temperature and humidity and 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 ...

Page 2: ...g on display MIN MAX Minimum Maximun readings Low battery indicator DP Dew point temperature AIR Air temperature WBT Wet bulb temperature Unit of relative humidity C or F Celsius Fahrenheit KEYPAD Turns the meter on and off Enters setup mode Sets as non sleep mode with Exits setup page mode Enters CO2 calibration with Enters RH calibration with Freezes the current reading on display Cancels data h...

Page 3: ...tors at collection points in your community or wherever batteries accumulators are sold Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle POWER ON OFF Press to turn the meter on and off At power up the meter emits a short beep and performs a 30 second countdown for meter warm up It then enters the normal operation mode with current CO...

Page 4: ...en since power on As well the TWA mode will display a weighted average of readings prior to 8 hours of operation 2 The CO250 takes at least 5 minutes to calculate STEL and TWA The display shows during the first 5 minutes from power on 3 The STEL and TWA values will keep updating every 5 minutes ALARM The meter features an audible alarm to give warnings when CO2 concentration exceeds the set limit ...

Page 5: ...DP WBT button to decrease the value Each press adjusts 100 ppm The alarm range is from 100 to 9900ppm When the preferred alarm value is set press the MN AV button to exit and save the setting or the CAL Esc button to exit without saving and return to P1 0 P3 0 TEMPERATURE SCALE Press the MODE button or the DP WBT button in P1 0 to access P3 0 for setting the temperature scale Press the MN AV butto...

Page 6: ...t bottle 2 In the normal mode Press and Hold the CAL Esc and DP WBT buttons to enter the 33 calibration CAL and calibrating value 32 7 if at 25 C will blink on the LCD with current temperature at the left 3 The meter is now calibrating and will finish in about 60 minutes when CAL and humidity stop blinking 75 calibration 1 After the 33 calibration plug the sensor probe into a 75 salt bottle 2 Pres...

Page 7: ... 5 to 60 C 23 to 140 F 0 1 Calculated from RH and Temperature Dew Point 20 to 60 C 4 to 140 F 0 1 Display Triple LCD with backlight Sensor Type CO2 NDIR non dispersive infrared technology Humidity Capacitance sensor Temperature air Thermistor Operating Conditions 0 to 50o C 32 to 122o F 95 RH non condensing Storage Conditions 20 to 60o C 4 to 140o F 99 RH non condensing Power Supply 4 x 1 5V AA ba...

Page 8: ...ore than 0 3 seconds and try again Check that the batteries have good contact and the correct polarity or that the AC adaptor is properly connected Slow response Check whether the air flow channels on the rear of the meter are blocked Error messages E01 CO2 sensor damaged E02 The value is under range E03 The value is over range E04 The original data error results in this error DP WB E07 Too low vo...

Page 9: ... 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 ...

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