Alpha Omega Instruments 800 Series User Manual

TEC WIRING
If the temperature should go in the “wrong” direction, check to make sure that the TEC
is configured as shown below:
Also, if using a thermistor as shown, the Series 800/850 temperature controller will
display Kohms on the display. This means that when the temperature increases, the
Kohms will decrease. Hence, the reason they call it a “NTC” (negative temperature
coefficient) thermistor.
Definitions
The Series 800/850 thermoelectric cooler controller is designed so that Channel 1
output is always supplying cooling power. This means that positive voltage will appear
at the positive output of the Series 800/850 TEC Controller when cooling. To avoid
any misunderstanding or problems, the following terms have been defined (please
refer to Figure 2.2):
+ CoolingPositive voltage is applied to the positive terminal of the
thermoelectric cooler (TEC) originating from the positive
output terminals of the Series 800/850 TEC Controller.
+ HeatingPositive voltage is applied to the negative terminal of the (TEC)
originating from the negative output terminals of the Series
800/850 TEC Controller.
+ Cold Side The side of the TEC that is opposite the side where the
leads are attached to the ceramic plate. This is the
controlled side where the temperature sensor should be
located.
+ Hot Side The side of the TEC where the leads are attached to
the ceramic plate. This is the side which should be mounted
to a heat sink (consult the manufacturer of the thermoelectric
cooler if selection of a heat sink is required).
ALPHA OMEGA INSTRUMENTS CORP. Instruction Manual
Series 800/850 Thermoelectric Cooler Controller Page 14
Thermisto
r
Heat Sink
TEC

Alpha Omega Instruments 800 Series Specifications

General

Brand	Alpha Omega Instruments
Model	800 Series
Category	Controller
Language	English