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

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

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

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

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

key for less than the 4-5 second timeout period, and

then re-presses an

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

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.