Torrey Pines Scientific, Inc.
12
X. SETTING TEMPERATURE AND OTHER FEATURES
Although the units can be set to -10ºC (-20 on XT’s), they can only go 30ºC (40ºC on XT’s)
below ambient. What that means is that the units may not reach -10ºC (-20ºC on XT’s) if
the ambient temperature is 25ºC. Also, the power available to heat and chill the plate and
samples on it is 50 watts for the IC20 and 100 watts for the IC20XR, IC20XR & All IC30’s.
This means that there are some larger loads that will not go as far hot or cold as wanted,
or, if they do, it will take longer than the unloaded plate will. For best results, use the
covers available as accessories. The part number for the cover for the aluminum blocks is
720-0009 for the IC20’s and 620-5509 for the IC30’s. Note that the IC20XR has twice the
power as the IC20 and will move samples blocks faster and farther away from room
temperature than the IC20.
SETTING TEMPERATURE
To set a temperature for the unit, simple press the UP or DOWN ARROW until the set
point temperature (“Set Point”) on the display shows the desired temperature. The unit
will now go to that temperature. Note that the actual plate temperature will be shown in
the display as “Plate”. You will be able to watch this number change as the unit drives
to the set point entered. If there is a problem with the temperature measurement
circuitry or if the calibration values are invalid, an error code will be displayed in the
location of the “Plate:” temperature. For example, if the low calibration measured value
is out of range, the unit will display “Plate: cal1”. See the “XII Temperature
Measurement Error Codes” section of this manual for a complete listing and the
appropriate course of action should an error occur.
SETTING TIMER
The timer is a countdown timer that reads in hours, minutes, and seconds continuously. It
can be set to 99 hours, 59 minutes and 59 seconds maximum. When the timer counts
down to zero, it will sound an audible alarm for one minute. When the alarm starts to
sound, the unit will then count up so that the user may see how long it has been since the
alarm timed out. The audible alarm can be turned off after it has sounded by depressing
the UP or DOWN ARROW.
The timer is set by accessing the Timer option in the Menu. See Figure 2 for details on
setting and starting the Timer. Figure 3 indicates how to stop the timer. When the timer is
stopped, the last timer value is “frozen” on the screen until either the Up or Down buttons
are pressed. This enables the user to capture the last value.
The Menu also includes Timer Options to control the features of the timer. The audible
alarm may be enabled or disabled when the timer reaches zero. If the “Auto-Off” feature is
disabled (“Auto-Off: no”), the unit will continue to control the plate to the set point
temperature when the timer reaches zero. If the “Auto-Off” feature is enabled (“Auto-
