2.1 Initialization screen
1. Displays for 1.5 seconds: TE TECHNOLOGY
www.tetech.com
2. Displays for 1.5 seconds: TE TECHNOLOGY
TC-720 Rev. ****
2.2 Primary screen
T1= ###.## °C
OUT= ###% [or OUT= OFF] T2= ##
The controller displays information about the following items:
1. The temperature of the control sensor to 0.01 °C resolution (T1)
2. The output level (% duty cycle) to the thermoelectric device (OUT)
3. The temperature of the secondary sensor (T2) in °C
• If the control sensor is either an open circuit or a short circuit (indicating that the sensor is not connected or
has failed), the controller will display SENSOR 1 ERROR on the top line of the display instead of
TEMP= ###.## °C. The output % will also be forced to 0% until the error is resolved.
• If a secondary sensor is not connected to the controller, T2= ### will not be displayed. (The software can be
used to force the display of T2 regardless of whether a sensor is connected. This can only be set through the
software; it cannot be set using the keypad).
• The primary screen will change its format if a ramp/soak program is running, has completed, or has been
terminated by the user before it has been completed. See section 2.4.2 for further details.
In addition, if an alarm condition has caused the power output to be turned off, the words ALARM and OUT=0% will
flash in alternating sequence in the place of the normal OUT=###% indicator.
When not using a thermistor on the secondary sensor input, the ALARM
2 TEMPS must be turned OFF and/or ALARM 2 FUNCTION must be set to
KEEP OUTPUT ON.
2.3 LED Indicators
The lower left of the TC-720 contains an ALARM LED underneath the symbol. The LED will be green if there is no
alarm condition or orange if there is an alarm condition.
The USB LED underneath the symbol will be white if there is communication between the controller and a
computer if connected by USB.
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