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2. Helix test system (test object with indicator system)
Figure 12: Helix test system (test object with indicator system)
Steam penetration of and air removal from hollow items (e.g. flexible tubes) are
tested with the help of a helix test, which includes a test object with an indicator
system, as defined in EN 867-5.
This object is a rolled-up tube with an indicator chamber at its end that holds
indicator strips (see Figure 12). For more information please note the detailed
operating manual of the manufacturer.
♦ Unscrew the internal split cylinder from the indicator chamber.
♦ Fold the indicator strip in the middle so that the indicator side is covered
by the liner.
♦ Insert the indicator strip into the opening of the internal split cylinder.
♦ Screw the internal cylinder holding the indicator strip onto the indicator
chamber.
INFORMATION
Check the integrity of the seal of the test object.
Running the Bowie & Dick test and the Helix test system
The sterilizer must be at working temperature when the Bowie & Dick test is
started (see Vacuum & Empty program).
♦ Place the STERICLIN Bowie & Dick simulation test pack in a steel wire
basket in the lower third of the sterilizing chamber near the door.
♦ Place the helix test pack (test object with indicator system) on a steel
wire basket near the bottom.
Thermo Scientific
8 Preparing for sterilization
47
Indicator strip
Internal split cylinder
Indicator chamber
with seal
Rolled-up tube
50112712_082007_GB
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