Brookfield Temperature Controller, Model 75 - Manual (Page 7)

Brookfield Engineering Labs., Inc. Page 7 Manual No. M/98-205-A0100
IV.3 SET The SET Key
The SET key is pressed when the operator wants to view or edit temperature data.
IV.4 The Arrow (direction) Keys
The ARROW keys are used to increment (or decrement) temperature values. To input tempera-
tures, a single press of either of these keys will result in a single digit increment in the displayed
temperature value. When large temperature steps are required, the user will find it simpler to
press and hold these keys and scroll through available numbers. At first, this will result in a slow
increment (or decrement) of the display temperature. However, after a couple of seconds, the
display will rapidly increment (or decrement) and the user must be careful not to overshoot (or
undershoot) the desired input value.
IV.5 HEAT The HEAT LED
The HEAT LED is illuminated when the controller is providing power to the Thermo Container.
The LED will flash at a rapid rate when the temperature of the Thermo Container is being main-
tained at a set temperature.
IV.6 RUN The RUN LED
The RUN LED is illuminated when the temperature of the Thermo Container is being controlled
by the Model 75 Controller.
IV.7 Piezo Buzzer
The unit includes a buzzer which will provide an audible tone (beep) in the following situations:
• During the Model 75 Controller’s startup sequence.
• If an unacceptable data entry has been made (e.g. attempting to set a temperature above or
below the allowable inputs).
• If the temperature probe is not plugged in or becomes disconnected.
V. TEMPERATURE CONTROLLER OPERATION
V.1 Powering Up the Model 75 Temperature Controller
The Model 75 Controller is turned on by placing the rear panel mounted ON/OFF switch in the
ON position. The buzzer will “beep” and, after a few seconds, the digital display will indicate the
present temperature of the Thermo container. When the unit is initialized, all of the indicator
LED’s are off.