C.B.S. Scientific TTGEK-2401-220 - Manual (Page 18)

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3.2 Heater/Stirrer Set-Up and Programming – continued
3.2o Fluid Type
Located in the Fluid Type screen are two adjustable parameters: Specific Heat and Volume. By adjusting the Specific
Heat you will be optimizing the circulator’s temperature control based on the fluid being used. The table below lists a
few common fluids. You can also refer to the MSDS sheets for your specific fluid.
The other parameter, Volume, is strictly for diagnostic purposes and does not affect the performance of the unit.
When the Specific Heat of the fluid and the Volume are entered correctly, the circulator will display the amount of
energy the unit is putting into the system (in Watts). When the unit is stable this will display 0+/-25 Watts.
FLUID DESCRIPTION SPECIFIC HEAT @25ºC
Distilled Water 1.00
Ethylene Glycol 30% / Water 70% 0.90
Ethylene Glycol 50% / Water 50% 0.82
3.2p Setting Operational Parameters and Functions
All operational parameters and functions are programmed and controlled via the Controller’s software settings. Most
are user-adjustable and easily accessed via the Main Menu. The Main Menu is accessed by rotating the Select/Set
Knob. A particular Main Menu item is selected by pressing the Select/Set Knob when that item is highlighted.
3.2q Setting and Starting the Timer
The Timer sub-menu allows you to program the Controller’s timer to alert you once a specific period of time has
elapsed. It should be used as you would an external timer.
IMPORTANT: The Timer is independent of temperature control. It does not start or stop heating/cooling. The
Controller continues maintaining temperature at the set point even though the designated time period has elapsed.
To set the timer, access Timer on the Main Menu, select Set, and then enter the desired period of time. The timer’s
audible signal can be turned On and Off via the selection named Beep on the Timer sub-menu.
To start the timer, press the Timer button on the Controller’s front panel. A timer icon and Beep icon (indicating either
On –
•
or Off – the icon with an X through it), along with a countdown timer, will appear on the bottom of the LCD. The
Timer LED will light continuously.
Once the designated time period has elapsed, the audible signal (if enabled) will sound and the countdown timer will
display the amount of time which has elapsed since the designated time period ended. The timer LED will flash.
To silence the audible signal and/or clear the timer display from the LCD, press the Timer Button.
The timer may also be paused at any time during the countdown period by pressing the Timer Button. When this
occurs, the Timer LED will flash and the word “Paused” will appear on the display adjacent to the countdown timer.