5. After one minute has elapsed, the controller display will begin to
alternate between showing the chamber temperature, tunE and At.SP.
6. Allow the program to run until the display again shows only the
chamber temperature.
1. Place a calibrated thermometer in the approximate geometric center of
the chamber in a position that would allow it to be read through the
glass door.
2. Press and hold the “STAR” (*) key and using the UP or DOWN arrow
key, adjust the set point to the desired temperature.
3. Allow the unit to run for at least 30 minutes.
4. The controller display should now be indicating the set point
temperature. Make note of the thermometer reading without opening
the glass door.
5. Press and hold both arrow keys until the controller display indicates
‘tunE’. Release the arrow keys. Press and release the down arrow key,
the display should now indicate ‘LEUL’. Press and hold the “STAR” (*)
key and, using the UP arrow key, adjust the display to read ‘3’. Release
the “STAR” (*) key. Press and release the UP arrow key until the
display indicates Zero. The display should now alternate between Zero
and a numerical value.
6. Using the examples shown below and the thermometer value obtained
in the previous step, enter the correct Zero value into the controller by
pressing the “STAR” (*) key and using the UP or DOWN arrow key. If
there is already a Zero value present, then add the new value to the one
already present.
7. When the correct Zero value has been entered, press and hold the two
arrow keys together until the display again indicates the chamber
temperature. If the procedure was done correctly, the controller display
should now agree with the thermometer reading to within ±0.5°C.
8. Allow the unit to run for at least 30 minutes.
9. Re-check the thermometer reading, the controller display and the
thermometer should agree to within ±0.5°C. If not repeat steps 4, 5
and 6 above.
5-4
High Performance Incubator
Thermo Scientific
Section 5
Operation
Autotune (continued)
Temperature
Calibration
Digital Temp. Reading
= 65°C
Digital Temp. Reading
= 60°C
Upper Display
= 60°C
Upper Display
= 65°C
ADD OFFSET VALUE
= +5°C
SUBTRACT OFFSET VALUE
= -5°C
