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Summary of Contents for Extech Instruments CO250
- Page 1 User's Guide Meter Model CO250 GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
- Page 2 Introduction Congratulations on your purchase of this Model CO250 Meter. This meter measures CO (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 3 Operation BATTERY INSTALLATION The meter is powered by 4 AA batteries or a DC adaptor. Install the batteries into the rear battery compartment observing correct polarity. When an adaptor is used, the batteries will be disconnected from the meter. The adaptor cannot be used as a battery charger. When the battery voltage drops below the required level, and “Lob”...
- Page 4 As well, the TWA mode will display a weighted average of readings prior to 8 hours of operation. The CO250 takes at least 5 minutes to calculate STEL and TWA. The display shows “----” during the first 5 minutes from power on.
- Page 5 SETUP (alarm limit and temperature scale) In the normal mode press and hold the button for more than 1 sec to enter the setup mode. To exit the setup mode, press the CAL/Esc button when either P1. or P3. is displayed. P1.0 CO ALARM Limit When entering setup mode, P1.
- Page 6 Calibration CALIBRATION The meter is calibrated to a standard 400ppm CO concentration at the factory NOTE: When the accuracy becomes a concern or after a year of use, return to Extech for a standard calibration. CAUTION: Do not calibrate the meter in an atmosphere of unknown CO concentration.
- Page 7 Specifications Function Range Resolution Accuracy 0 to 5000ppm 1ppm ±(%5rdg + 50ppm) 5000 to 9999ppm 1ppm Not specified Pressure dependence: +1.6% reading per kPa deviation from normal pressure, 100kPa -10 to 60°C Temperature 0.1° ±0.6°C/0.9°F 14 to 140°F ±3%(10 to 90%) Humidity 0.0 to 99.9% 0.1%...
- Page 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).
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