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Thermo Fisher Scientific
User Guide STP420D/STP420ES
introduction
Filter System
The filter systems of the STP420 comprise an air filter system and a
reagent filter.
The reagent filter consists of a blue sponge positioned below the metal
screen at the bottom of the rotary chamber. It captures floating material
and debris and prevents them from entering the reagent tubing system.
The STP420 air filter system consists of a wash bottle and an active
charcoal filter:
Air contaminated with reagent vapor is not released directly into the
ambient air. It is pumped through the chamber and separated from the
solvent vapors in two steps:
• The pumped air is guided through the wash bottle, which is filled
with water. The water-soluble constituents of the vapors (for
example, alcohol) are completely condensed in this bottle.
• Then the air is passed through the large active charcoal filter, which
filters any vapor still remaining.
Note: idle time can be adjusted in order to avoid vapors escaping from the
chamber on opening. The idle time value will determine how long fresh air
is pumped into the chamber after cleaning and before the lid is released for
opening. See sections 3-7-3
1-8 Filter System
Figure 9.
Location of the filter system.
[1] Wash bottle
[2] Charcoal filter
[1]
[2]
