K259XX Constant Temperature Water Bath
Operation and Instruction Manual
K295XX-Manual
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11-
4.2 Temperature Controller Operation
Figure 4. Temperature Controller
1. Process Temperature Display.
The upper
red LED display shows the process
temperature as read from the RTD probe.
2. Set Point Temperature Display.
The lower
green LED display shows the set point
temperature of the controller.
3. Programming
Key.
Permits
scrolling
through controller menu parameters. One
Level Forward
4. Down Key.
Used to decrease the set point
temperature and to decrease or change
parameter values when programming the
temperature controller.
5. Up Key.
Used to increase the set point
temperature and to increase or change
parameter values when programming the
temperature controller.
6. Exit / Function Key.
This key is used to exit
or leave a level. One level backward
IMPORTANT
NOTE:
The
digital
temperature controller for the unit comes
pre-programmed from the Koehler factory.
Please do NOT attempt to re-program the
digital temperature controller as this will void
the product warranty. If assistance is
required, please do not hesitate to contact
the Koehler technical service department.
Setting the Temperature
. Set the desired
operating temperature by adjusting the set
point with the up and down keys. The set point
will be displayed in the lower green Set Point
LED display and the actual temperature will be
displayed in the upper red Process LED
display. Please allow the instrument to fully
equilibrate before proceeding with any testing.
Temperature Calibration.
This routine allows the
digital temperature controller to be calibrated
to a certified thermometer.
a. Use a certified calibrated measuring
device
to
acquire
the
temperature.
Calculate the difference between the
measuring device and the Process value
displayed on the controller.
b. Press the program key two times until
PCt
is displayed in the lower green LED
display. Press the DOWN key. CAL will
display on the lower green display. If there
is a value observed in the upper red LED
display, add it to the calculated difference
obtained in the previous step. This is the
offset value.
c. Press the Program Key. The lower green
display will flash. Use the up or down keys
to adjust to the new calibration offset value
on the upper red display calculated in the
previous step. When the value has been
entered, the controller will automatically
store the value. The lower green display
will stop flashing. If further adjustments are
necessary, press the Program Key again.
Resume regular operations by pressing
the Exit / Function key two times. Verify if
the new calibration is correct by observing
the upper red display and comparing the
value with the calibrated reference device.
Auto Tune.
This routine allows the digital
temperature control to learn the heating
parameters needed for any particular set point
temperature. This operation should be done
when installing a new unit, after replacing or
changing the bath medium type, or utilizing a
different temperature set point 20% different
from
the
previously
used
set
point
temperature.
a. Set the operating temperature to the
desired setting.
