Setting the Proper Height of the 6400-04 Thermocouple
The 6400-04 thermocouple position generally needs to be high enough to touch the leaf with the fine-wire thermocouple, as seen in the figure below.
If the thermocouple is not positioned high enough, the thermocouple will measure air temperature in the chamber rather than leaf temperature. If the thermocouple is too high, the leaf can put pressure on the flexible supporting hoop. This pressure may tear or puncture delicate leaves or…