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Chapter 4
Annual Maintenance Checks
N O T IC E
For extreme conditions it is recommended that more frequent
maintenance be performed every month.
1. Any maintenance should be performed only after powering
the unit down by disconnecting the USB cable from the
power adapter.
2. TSI
®
recommends replacing the PM sensor once a year.
3. To replace the PM sensor, disconnect the cable between the
sensor and the PC board, from the PC board.
4. To remove the sensor from the base, push on the black plastic
release to the right of the carrier board and pull up on one side of
the carrier board until it is free from the base.
5. The replacement sensor will come with a new cable assembly.
Insert the new sensor by aligning the sides of the carrier board
and pushing down evenly on both sides until the board bottoms
out and snaps in place. Connect the new cable to the main board.
6. Replacement sensor kit can be purchased from TSI
®
. See the
section at the beginning of the manual.