Basic Documentation

Maintenance
Replacing AQS2700
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6 Maintenance
6.1 Replacing AQS2700
Replace the sensor module due to:
● Reaching its end of lifetime: as indicated via LED or LCD, and output signal.
Refer to Troubleshooting [➙ 35] for the indication.
● The measurement is not as accurate as specified. The sensor still works but is
indicated via LED or LCD. Refer to Troubleshooting [➙ 35] for the indication.
Sensor module accuracy is influenced by ambient environment. We recommend to
replacing the module every 1 to 3 years depending on the local environment. In
environments with continuously high PM2.5 concentrations (i.e. greater than 300
μg/m
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, e.g. a smoking room), replace the module more often.
To replace the sensor module:
l Detach the housing from the mounting plate using a screw driver.
l Take off the module by hand and replace it with a new one.