How can I measure THot or TCold in a thermoelectric assembly?
This is somewhat challenging because you have to get the measuring device as close as possible to the outer ceramic of the Peltier device while it is in operation. The best choice of sensor here is typically a non-sheathed thermocouple fabricated from fairly fine wire. One way to approach the placement of the thermocouple, is to take the heat sink or block which will be mounted to the TE device and cut a shallow groove at the interface. The thermocouple wire can then be placed so that it will be in close proximity to the module’s center once the system is assembled. Of course, except for the exposed end of the thermocouple, the wires should be electrically insulated along the length of the groove to prevent shorting. The thermocouple should be potted into the groove using a thermally-conductive adhesive; be sure to clean off any burrs or excess adhesive to maintain the flatness of the interface. A compromise which can sometimes be employed when using heat sinks, is to mount the thermoc
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