Oven or Heat Gun
Spare Parts or Annual Maintenance Kit
Procedure
1. Prepare and cut three pieces of black electrical tape approximately 5cm in length and layer them
approximately 3cm wide. Keep these near your work area as we will use this immediately to
protect the PMT as the reaction cell is being removed.
2. Turn the instrument off, Wait fifteen minutes for the cold block on the optical cell to warm up to
prevent condensation.
3. While the cold block is warming up allow the vacuum pump to purge the instrument for five
minutes then turn off the vacuum pump and allow the instrument to return to ambient.
CAUTION
Because the PMT is extremely sensitive to light, it is essential that before opening
the PMT assembly to make sure that the instrument is switched off. Once the
instrument is switched off it is very important to cover the PMT at all times so
that no direct light reaches its window.
4. Disconnect the electrical and pneumatic fittings from the reaction cell, remove the four screws
that secure the reaction cell to the optical cell and remove the assembly.
Figure 59 – Remove Reaction Cell
5. Cover the PMT window on the optical cell (under the reaction cell) with the black electrical tape
immediately.
6. Turn the reaction cell upside down and remove the four screws fastening the optical filter from
the cell (refer to Figure 60).
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