Tag Value Filtering

I have a thermocouple mounted in a pressured furnace. When the furnace is at peak temp a pressure is applied to the furnace. When the pressure is applied, the thermocouple begins to throw in false readings.

Is there a way to set a filter on values that fall outside of a certain degree of change from the previous tag values? I have tried the ‘Exponential Filter’ scale mode, but the false reading is more than an order of magnitude different so the filtered value is still significantly altered.