K34710, K34711, K34712 Brookfield Viscosity Liquid Bath
Operation and Instruction Manual
K34715, K34716-Manual
-
6-
4.1
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. In the
calibration mode, the display will always give
2 decimal places.
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.
