C.B.S. Scientific TTGEK-2401-220 - Manual (Page 21)

TTGE Instruction Manual, version 8/30/2011
21
www.cbsscientific.com
3.2 Heater/Stirrer Set-Up and Programming – continued
To clear an Alarm Low warning, correct the problem or decrease the Alarm Low temperature value.
Limit Low Temperature — This feature provides additional safety and protection by allowing a selectable lower
temperature limit set point.
If you attempt to enter a set point value that exceeds the Limit Low value, the audible alarm will sound and a Warning
message will flash on the display when the Limit Low value is reached. You will also be prevented from decreasing
the set point value any further.
To clear a Limit Low warning, enter a lower value for the Limit High or increase the control temperature set point.
If the Limit Low value is exceeded during operation (due to a Controller fault, excessive cooling load, etc.), a Fault
message will appear on the display and power to the heater and condenser will be disconnected. The pump will
continue to run.
Limits/Alarms Example
Initial Bath Temperature = 20°C
Bath Temperature Set Point = 37°C
Limit High Temperature = 60°C
Alarm High Temperature = 40°C
Alarm Low Temperature = 35°C
Limit Low Temperature = 11°C
3.2t Selecting the Pump Speed
Pump speed is selected from the Pump/AutoTune menu. This display shows the current pump speed setting. Five
pump speed settings are available – Maximum, Fast, Medium, Slow, and Minimum. Select Minimum for DGGE
applications.
If bath temperature moves above
or below Limit values, alarm
activates and power to the heater
and condenser is disconnected.
Limit Low Set Point. Bath set
point temperature cannot be
lowered below this value.
Low Temperature Alarm disabled
until bath temperature rises above
Low Temperature Alarm set point
value.
High Temperature Alarm Set Point. Alarm activates if bath
temperature rises to this value.
Low Temperature Alarm Set
Point. Alarm activates if bath
temperature falls to this value.
Limit High Set Point. Bath set point
temperature cannot be raised above this value.
10 20 30 40 50 60 70 80 90
M i n u t e s
Degrees