Maintenance And Troubleshooting; Battery Replacement - Extech Instruments CO240 User Manual

Maintenance and Troubleshooting

Battery Replacement

When the battery icon appears on the LCD, the batteries must be replaced.
In a downward motion, slide the rear battery compartment cover off of the meter housing.
Remove the old batteries and replace with new batteries (all of the same type) observing correct
polarity. This meter uses six (6) 1.5V AAA batteries. Please replace the battery compartment
cover before attempting to use the meter.
Battery Safety Reminders
o Please dispose of batteries responsibly; observe all relevant regulations.
o Never dispose of batteries in a fire; batteries may explode or leak.
o Never mix battery types; install new batteries of the same type.
Troubleshooting / Error Message Displays
Erratic Readings
ER1 Display
ER2 Display
"9999" Display
Replace the batteries or use the AC/DC adaptor and check again.
CO Temperature or Humidity sensor failure or a sensor communication
2,
error. Send for service if display persists.
Out-of-range condition for CO
Detected reading exceeds CO
specification. This error is normal when clearing the maximum and
minimum readings in the MAX/MIN mode.
Reading exceeds the CO
power is weak.
Temperature or Relative Humidity.
2,
Temperature or Humidity range
2,
maximum measurement range or the battery
2
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