Fisher Scientific Isotemp 100L Incbtr Grvity 120V, User Manual

Page: 27 / 86

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The PT 100-type sensor for the control of the work space temperature and for the thermal
protection [1] is installed on the bottom of table-top incubators and in the top of floor stand
incubators.
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The work space temperature sensor provides the inputs to the incubator’s built-in controller,
which continuously compares the measured values to the user-specified set value and adjusts
the heaters according to the result.
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The unit features a thermal protection function that is factory-preprogrammed and not
adjustable. It protects the cultures in the work space from overheating: Thermal protection
kicks in on a brief violation of the upper limit, based on the defined setpoint temperature, at
between 2 and 3 °C (35.6 °F and 37.4 °F) (37 °C (99 °F): 2 °C (35.6 °F), > 50 °C (122 °F):
3 °C (37.4 °F)), automatically reducing the work space temperature to the user-specified set
value and allowing the incubation process to be continued even in case of a controller
malfunction. If the thermal protection is activated, the error message (E111) “Temperature
too high” appears in the display window and an audible alarm is sounded.
When the user acknowledges the error message, the red alarm icon (D4 in figure on page 7-1 )
is illuminated and the Temperature Set Value icon (see table 7-3 on page 7-3 ) is highlighted by
a red border to indicate that thermal protection has kicked in.