Humboldt H-3185B Rapid, Freeze Thaw Cabinet - Manual (Page 12)

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5.6 Setting Ramp Times
1) Continuing from section 5.5, while the green display is alternating between
“PFrE” and the set option as in the previous section, continue pressing the
Mode button until the green display reads “rt1” (Figure 15). The display
will alternate between “rt1” and the ramp time value (in minutes) for the first
ramp in the cycle. It is capable of 8 ramp operations in the cycle. This is the
first ramp time setting. The soak time and temperature for the first ramp
must be programmed or skipped before going to the next ramp time
setting. It is preset to 5 minutes.
2) To change the ramp time, press the up or down arrow button until the
desired ramp time is achieved.
Note: Due to the thermal behavior of the Freeze/Thaw machine and the
response of the sample material, it is not recommended that this setting be
increased as this could cause fluctuations in the cycle ramp and greatly increase
the overall cycle time.
5.7 Setting Soak Temperatures
1) Continuing from section 5.6, while the green display is alternating between
“rt1” and the set ramp time value, continue pressing the Mode button until
the green display flashes “SL1” (Figure 16). The display will alternate
between “SL1” and the soak temperature value in degrees F. As in the case
of the ramp time, this is the first of 8 soak levels available. Soak level 1 is
preset to 0.
2) To change the soak temperature, press the up or down arrow button until
the desired temperature is achieved.