Marathon Computer UNIPRO V3.5 - Manual (Page 19)

Marathon Monitors Inc
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Unipro 3.5 Process Control 1 Aug. 1997
Thermocouple Burnout Jumper Selection
The thermocouple jumper selects either a full upscale or a full down
scale reaction to take place when a thermocouple fails or becomes
open. The jumper can be found on the thermocouple board, and
has two possible settings (see Figure). For full scale upwards, place
the jumper from the + to the C, and for full scale downwards, place
the jumper from the - to the C.