CO250 Datasheet, PDF (9/10 Pages) Extech Instruments Corporation. – CO2 Meter

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).
CALIBRATION AND REPAIR SERVICES
Extech offers repair and calibration services for the products we sell. Call the Customer
Service Department for information on calibration services available for this product.
Extech recommends that annual calibrations be performed to verify meter performance
and accuracy.
TROUBLESHOOTING
Can’t power on
Press SET 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: 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 voltage to measure CO2, replace batteries or use an adaptor.
E11: Retry humidity calibration.
E17: Retry CO2 calibration.
E31: Temperature sensor damaged.
E34: Humidity sensor damaged.
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CO250 V1.2 1/09