To activate the self-test routine, follow the steps below.
1. Press and hold the function button on the front of the XD1+ to initiate the function sequence.
2. Release the function button on the front of the XD1+ when all icons are illuminated blue.
Following the self-test routine the XD1+ will display a “Pass” / “Fail” result via an audible visual alarm.
The XD1+ will automatically begin to sample particulate concentrations.
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