Over temperature limit system, Operation (continued) – Shellab SCO6AD User Manual
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OPERATION (CONTINUED)
Humidification
Humidification is provided by filling the humidifying pan included with the unit. The pan is then
placed on the heated chamber floor. Evaporation driven in part by heating raises the relative
humidity percentage (RH%) of the chamber. A copper anti-microbial token helps to retard the
growth of microbiological organisms in the pan.
Decontamination Cycle
The SCO6AD comes with a user-initiated eight-hour high heat cycle designed to kill microbiological
organisms. This automated cycle consists of three stages: A 1.5 hour ramp up from room or
incubation temperature to 180°C; a 2 hour soak at 180°C; and a 4.5 hour cool down. Prior to
launching a decontamination cycle the humidity pan should be drained and its copper antimicrobial
token removed to prevent discoloration of the pan.
Physical and Data Access
A copper-filtered access port on the right side of the unit allows sensor and monitoring probes such
as, thermocouples and humidity meter solid state probes, to be inserted and left in the chamber
without compromising the CO
2
atmosphere. An atmosphere sample port for independently verifying
the CO
2
concentration in the chamber is provided on the Over Temperature Limit System control
panel. This panel also has a contact jack port that activates whenever a temperature or CO
2
alarm
is triggered. A USB-style serial port on the same panel is provided for digital capture or monitoring
of temperature and CO
2
entry on page 38 for more details.
The Over Temperature Limit System (OTL)
When set, the OTL system prevents runaway heating in the event of a main control failure by
depowering the heating element whenever the temperature in the incubator chamber exceeds the
OTL setting. Typically the OTL is set 1°
C above the temperature display’s set point. Because of its
nature as a cutoff system and its lack of PID analytics, the OTL cannot deliver the same degree of
temperature stability and measurement precision as the digital display and controls. The OTL
System should only be used as a means of heating regulation for the incubation chamber until a
failed controller board can be repaired or replaced.