Serinus 40 User Manual 2.2
3. Remove the old desiccant packs and replace with new ones. Do not attempt to dry and reuse the
old packs.
4. Inspect the inside of the PMT housing (by touch or with an inspection mirror) to check for
moisture inside the housing. If moisture is detected inside the housing or the desiccant pack is
saturated, the desiccant pack should be replaced more frequently.
5. Reinstall the desiccant cap by gently twisting and pressing the cap back into the PMT housing. It
may help to apply a small amount of lubricant to the O-ring on the desiccant cap. Secure with
two screws.
CAUTION
Do not attempt to use the fastening screws to push the desiccant cap in place in
the PMT housing. This will damage the PMT housing.
6. Reconnect power and restart the analyser.
6.4.7 Cleaning the Reaction Cell
As O
3
reacts with the contaminants in the air it will begin to deposit a film on the walls and optical
filter within the cell. This will result in decreased sensitivity of the analyser and increase the gain
required to take readings. The reaction cell should be cleaned periodically to remove deposits and
restore sensitivity.
CAUTION
Take extreme care not to damage the pressure transducer assembly on top of the
reaction cell.
CAUTION
Because the PMT is extremely sensitive to light, it is essential that before opening
the PMT assembly to make sure that the analyser is switched off.
Once the analyser is switched off it is very important to cover the PMT at all times
so that no direct light reaches its window.
1. Turn off the analyser and disconnect the pump.
2. Disconnect the electrical and pneumatic fittings from the reaction cell, remove the four screws
that secure the cell to the PMT housing, and remove the reaction cell from the PMT housing
(refer to Figure 57).
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