Thermo Scientific RC 12BP Plus Instruction Manual page 41

4
Operation
Using Advanced Features (Options)
CHANGE OVERTEMPERATURE LIMIT
• CHANGE OVERTEMPERATURE LIMIT allows changing the maximum allowable sample
temperature to establish a new overtemperature offset value.
• The centrifuge calculates the difference between the set and the maximum temperatures, and
retains that value as an offset to apply to future runs, until it is changed. The retained offset will
apply to any normal (manual entry) run.
• Recalling program runs may change the overtemperature limit. Specific overtemperature limit
settings can be saved in run programs. See the EXAMPLE:
EXAMPLE: If you have a set temperature of 22°C and set the maximum temperature to 24°C, an
overtemperature alert will occur if the calculated sample temperature reaches 25°C. If the set
temperature is then changed to 4°C, the maximum temperature setting will automatically change
to 6°C.
• During a run, if the calculated sample temperature in the RUN display goes above the maximum
allowable sample temperature, the run will terminate, a SAMPLE TEMPERATURE OVER
LIMIT message will appear in the SET DISPLAY, and an alarm will sound. This may indicate a
condition requiring simple corrective action, or it could indicate a refrigeration problem
("SAMPLE TEMPERATURE OVER LIMIT"
• Overtemperature termination is deactivated when a temperature change between programs occurs
in a QC RUN. The QC RUN is repeated until the temperature is within 2°C of set temperature.
• After CHANGE OVERTEMPERATURE LIMIT selections are completed, SELECT STEP
RUN? will appear in the SET DISPLAY.
STEP RUN
• STEP RUN allows the linking-together of up to three sets of programmed run parameters to
automatically perform step run protocols.
• If the desired parameters have not been entered into memory, you must save each desired set of
parameters to memory before continuing with step run creation.
• If programs are used within a step run, that have not been defined before, a warning message will
be displayed.
• To create a step run, input a program number 1-9 for the first portion of the step run.
• The SET DISPLAY will prompt for another number, input a program number 1-9 for the second
portion of the step run.
• The SET DISPLAY will prompt for another number, and you can either press ENTER (if you are
creating a two-stage step run), or input a program number 1-9 for the third portion of your run.
Note When step run is selected, the specified programs must specify the same rotor at similar
temperatures
• Step runs can be saved to program memory (program numbers 10-15) for simple recall in future
use (see SAVE RUN below).
• Runs are not inadvertently corrupted, whenever STEP RUN has been selected (indicator lit).
4-12 RC 12BP+
on page 7-3).
Thermo Scientific