Hach Lange astroTOC Basic User Manual page 34

Replace the IR cell
Electrocution hazard. Remove all power from the instrument and relay connections before this
maintenance task is started.
Note: After a new IR cell is installed, the thumb latch must be adjusted. Improper adjustment of the thumb latch can
damage a new IR cell assembly and make it impossible to correctly align the mirror.
1. Remove the inlet and outlet tubing from the IR cell. Refer to
2. Disconnect the power connector from the I/O board.
3. Support the mirror assembly to prevent the cell assembly from falling out if the thumb latch
releases unexpectedly. Refer to
4. Cut the tie wrap. Refer to
5. Pull the thumb latch away from the cell assembly to release it. Refer to
6. Install the new IR mirror assembly and connect the power connector to the I/O board.
7. Install a new tie wrap.
8. Restore power and do a pressure/leak test. Refer to
34 English
D A N G E R
Figure 18.
Figure 18.
Figure 18.
Figure
Pressure/leak test on page 33.
18.