Maintenance; Troubleshooting; Co2 Levels And Guidelines - Extech Instruments CO250 User Manual

Maintenance

CLEANING AND STORAGE

TROUBLESHOOTING

CO
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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).
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 sensor damaged.
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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
E11: Retry humidity calibration.
E17: Retry CO calibration.
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E31: Temperature sensor damaged.
E34: Humidity sensor damaged.
Levels and Guidelines
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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: CO
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 CO
over the whole day(i.e. 9am to 3.30 pm) should not exceed 1500ppm.
Germany, Japan, Australia, UK...: 5000ppm, 8 hours weighted average in occupational
exposure limit is 5000ppm.
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, replace batteries or use an adaptor.
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