Thermocouple Arrangement

The two thermocouples measure a temperature inside the oven. One of them is bent to the front. It is also not really fixed, so its tip can be rotated to be higher or lower. I use this as a feature so I can lower it to an object on the grate:

The straight thermocouple is called 'A', the bent one is called 'B'. This picture also shows the two heaters which are protected by some metal part with holes in it. Pretty bad for convection. The diameter of the heaters is $d_H \approx 12~\mathrm{mm}$, the length (also the width of the oven) is $L_H \approx 260~\mathrm{mm}$.