V.2 setting a temperature – Brookfield Temperature Controller, Model 75 User Manual
Page 8

Brookfield Engineering Labs., Inc.
Page 8
Manual No. M/98-205-A0100
V.2 Setting a Temperature
1) Press the
SET
key.
Note:
The Model 75 Controller will display the last set point temperature value upon
entering the temperature setpoint screen.
If you do not press either of the
or
keys or the
SET
key within approximately 4-5
seconds, the Model 75Controller will “beep” and revert to its non setpoint mode (the
temperature will again be displaying tenth degree values). Simply press the
SET
key again
to re-enter the temperature setpoint mode.
2) A press of either the
or
keys will cause the tenths degree digit to stop flashing and
the tenths degree value to begin incrementing (or decrementing) at a one-to-two character
per second rate. When the scrolled tenths value exceeds ten-tenths of a degree (i.e. one
degree) in either direction, the scroll speed will then accelerate and the ones digit will then
be incremented (or decremented) as required. If the
or
keys are held in for an
extended time, the scroll speed will again increase to its maximum rate.
3) If the user lets up on an
or
key for more than the 4-5 second timeout period, the
display will revert to that of the current Thermo Container temperature with no change in
the setpoint temperature taking place. At this point, a press of the
SET
key will display the
last valid setpoint temperature that existed before the user began to change the setpoint
temperature.
4) If the user lets up on the
or
key for less than the 4-5 second timeout period, and
then re-presses an
or
key, the display will return to the tenths degree digit set mode
and again the temperature set mode as described above.
5) If the user scrolls to some new setpoint temperature, lets up on the
or
keys and
presses the
SET
key, the Model 75 Controller will accept the scrolled to temperature as the
new set point temperature. If the user had pressed the
RUN
STBY
instead of the
SET
key, the
Model 75 Controller would have begun controlling the Thermo Container at the new
scrolled-to setpoint temperature. In this case, the
RUN
LED would illuminate and the
HEAT
LED may or may not be lit depending on the temperature in the Thermo Con-
tainer compared to the setpoint temperature. In any case, the Model 75 Controller action
will regulate the temperature of the Thermo Container to the new setpoint temperature. The
current temperature of the Thermosel Container will be displayed on the front panel digital
display with the
RUN
LED illuminated. Power will be provided to the Thermo Con-
tainer if the new setpoint temperature is above the previous temperature of the Thermo
Container. When power is provided to the Thermo Container, the
HEAT
LED will be
illuminated. The Model 75 Controller will provide power to reach the indicated set point
and maintain it at that level indefinitely.