5 Maintenance
5-6
(From left to right)Sample plate, Dust cup, Gap gauge and Electrode removal tool
(1) Maintenance cycle
To remove evaporated sample from the tip of the electrode, either of the two
methods listed below is usually used. The maintenance cycle for the spark stand
depends on the method selected. (The cycle is described in the table about
periodical maintenance in page 5-2.)
<Cleaning by reverse discharge>
In this method, discharge is performed with the polarity of the sample and
electrode opposite to automatically remove evaporant.
If the reverse discharge time is too short, evaporant may not be removed
completely. On the contrary, if the reverse discharge time is too long, the tip
of the electrode may wear.
Maintenance cycle: Every 200 to 300 discharges
<Manual brushing>
In this method, the tip of the electrode is cleaned with the accessory brush
to remove evaporant. The tip of the electrode must be cleaned every time
analysis is finished to prevent excessive evaporant accumulation.
Maintenance cycle: Every 3,000 discharges
Performing either of the above shortens the electrode. The electrode can be used
until its total length becomes 65mm. (A new electrode is 100mm long.)
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