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Need to switch 808 controller to reverse acting and can't do it

We have a Eurotherm 808 single loop controller that we want to be reverse acting, instead of direct, and don't seem to be able to do it. The sensor is a type J thermocouple, and is not linear. It almost seems from the manual that if you have a non-linear sensor that it is not possible to set as reverse acting. Can anyone comment? Thx
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