Controlled-Rate Freezer
Operation | 27
to the specified temperature. This step should be used when
the starting Sample temperature is greater than the specified
Sample temperature (the Sample is cooling).
IMPORTANT:
Step 1 only permits a Wait or Wait For as
command to properly start a profile.
Ramp:
RAMP X.X°C/MIN UNTIL CHAMBER=Y.Y°C (or) RAMP
X.X°C/MIN UNTIL SAMPLE=Y.Y°C.
•
X.X is the ramp rate and Y.Y is the chamber (or sample)
endpoint temperature.
Figure 65. Ramp Command
This command changes Chamber temperature from its
current value to the Setpoint temperature at the selected rate
(°C/minute). The rate can be set over a range of 0.1°C/ minute
to 99.9°C/minute. The temperature can be set over a range of
-180°C to +50°C (±0.1°C). When the chamber reaches the
specified temperature, the control moves to the next step in
the profile. If Sample is selected, chamber temperature
changes at a specified rate until sample reaches specified
temperature.
Note:
The slope of the temperature ramp is determined
automatically, based on the temperature defined and the
chamber temperature at the beginning of the step.Entry of a
sign (+/-) for the temperature ramp rate term is not allowed.
Hold:
HOLD X.X°C FOR Y.Y MINUTES.
•
X.X is the chamber set temperature and Y.Y is the
minutes.
Figure 66. Hold Command
Maintains a specified Chamber temperature for the specified
hold duration before proceeding to the next step. The time
can be set over a range of 1 to 99 minutes, and the
temperature can be set over a range of -180°C to +50°C with
a setting resolution of 0.1°C.
Jump To:
JUMP TO STEP X.
•
X is the step number.
Figure 67. Jump To Command
Automatically advances to a subsequent step or returns to a
previous step in a freezing profile. The Jump function can be
programmed over a range of Step 1 to END Step.
Loop:
LOOP X TIMES STARTING AT STEP Y.
Figure 68. Loop Command
X is number of repetitions and Y is the step number to repeat.
Automatically advances to a subsequent step or returns to a
previous step in a freezing profile for a programmable number
of repetitions. The Loop function can be programmed from
Step 1 to END Step, and over a range of repetitions from 1 to
99.
End:
End the profile at that step.
Note:
Each profiles last action step must be END.
End Command.
CAUTION:
Steep ramp rates may cause
chamber to be much colder/warmer than the
sample itself.