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Operation
The main use of a heater/cooler control device such as the
CL-100
is to
maintain a constant bath temperature with minimum deviation from a set
temperature. This is usually achieved by using a thermally controlled cham-
ber/platform or in-line solution heater, or a combination of both.
NOTE: Refer to the front and rear panel schematics on pages 6-9 for orien-
tation of the CL-100 controls.
Automatic Mode
In
Automatic Mode
, the
CL-100
maintains the temperature of the
connected heater/cooler at the value set by the user.
Operation is straightforward. Connect your heater/cooler device and
sensor thermistor as described on page 10. Set the
CL-100
to
internal
commands
by setting the INTERNAL/EXTERNAL SELECT control (Item J)
to
internal
. Place the
CL-100
into
auto
mode by switching the COOLING
MODE SWITCH (Item C) to
auto
. Switch the METER (Item B) to
Set Temp
and adjust to the desired set-point using the SET TEMPERATURE control
(Item H).
Alternatively, the
CL-100
can be commanded using external inputs. Set the
CL-100
to
external commands
by setting the INTERNAL/EXTERNAL
SELECT control (Item J) to
external
. In this mode the
CL-100
will accept
external temperature settings from the EXT TEMP SET BNC (Item R) on the
instrument rear panel.This input is calibrated to 100 mV/ºC.
The selectable LOOP SPEED control (Item G) is used to adjust the speed of
the feedback loop in the heater/cooler-thermistor system, which controls
the rate of change of the
CL-100’s
output voltage. Non-Warner heater sys-
tems with feedback thermistors can be used in
automatic mode
provided
they are compatible with the
CL-100
requirements.
LOOP SPEED is normally set to
fast
to provide the shortest cycle time
between the application of power to the heater element and the sensing of
temperature at the thermistor. For heater/cooler-thermistor systems with
long response times, the
fast
setting will cause the temperature to over-
shoot the target by a large amount resulting in system oscillation. For this
condition, try
medium
or
slow
settings to find the optimum feedback rate.
Publication 5702-001-REV-A
