Shimadzu PDA-7000, Инструкция по эксплуатации

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5 Maintenance
5-18
5.4 Exchanging the electrode O-ring
Electrode O-ring deteriorates due to the temperature rise caused by discharge and
also by repeated removal and insertion. Although the deterioration level differs
according to the usage frequency, replace it with a new one monthly.
1 The electrode should be replaced when it is pulled out. Pull out the electrode
following steps 1 through 10 described in "5.3 Maintaining the spark stand".
2 Detach the O-ring using a toothpick or plastic screwdriver. (Do not use a metal
screwdriver for watches because it may damage the sealing surface of the
O-ring.)
3 Apply a small amount of silicone grease to the new O-ring before attaching it.
4 Fix the electrode following steps 11 through 29 described in "5.3 Maintaining the
spark stand". In step 15, insert the electrode while rotating it so that the O-ring
can fit on the groove properly.
Cross section through the spark stand
Sample plate
Electrode
Electrode O-ring
Dust cup
Emission
chamber